Iec 61966 3 2000

Microsoft Word 1966 3f ed1 doc NORME INTERNATIONALE CEI IEC INTERNATIONAL STANDARD 61966 3 Première édition First edition 2000 03 Systèmes et appareils multimédia – Mesure et gestion de la couleur – P[.]

Conditions d'environnement

All measurements specified in this standard must be conducted in an area free from significant electromagnetic fields With the exception of the measurement in Article 13, all specified measurements should take place in a dark room Special attention must be given to avoid illumination from reflections caused by the environment (such as tabletops and walls) and direct lighting from instrument indicators.

Il convient qu'une heure de préchauffage précède les mesures de 7.2, 9.2, 10.2, 11.2 et 14.2, sauf spécification contraire du fabricant de l'appareil.

It is essential that the voltage and frequency of the power supply match the specified values provided by the cathode ray tube display manufacturer To ensure that the power supply voltage remains within 5% of the assigned value, a stabilized power supply should be used when there are fluctuations in the mains voltage.

D'autres conditions d'environnement, telles que la température ambiante et l'humidité relative, doivent être consignées avec les résultats de mesures.

Si des conditions d'environnement complémentaires sont décrites dans les spécifications du fabricant, il y a lieu d'en tenir compte.

Conditions de mesures

a) Le contraste, la luminosité et les réglages complémentaires doivent être placés dans les positions de préréglage spécifiées par le fabricant de l’appareil en cours de mesure.

When the settings deviate from the manufacturer's specifications, the actual position or corresponding value must be recorded alongside the measurement results The arrangement of equipment for non-contact measurements should adhere to the guidelines illustrated in Figure 1 This equipment includes a non-contact spectroradiometer or colorimeter, depending on the characteristics being measured The optical axis of the instrument must be perpendicular to the center of the cathode ray tube (CRT) display, and the distance $d$ should be greater than or equal to $4h$.

It is advisable to take precautions to ensure that vibrations do not affect the measurements and that no image elements are missing from the instrument's field of view.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU.

The tristimulus values, denoted as X′, ′, and ′, are normalized by Y n (cd/m²) for peak white The effective height and width of the CRT display are represented by h and w, respectively Additionally, the distance (d) between the faceplate of the CRT display and the measuring instrument must be at least four times the effective height (d ≥ 4h).

All measurements outlined in this standard must be conducted in an environment devoid of significant electromagnetic fields and in a dark room, with the exception of those specified in clause 13 It is crucial to minimize reflected light from surrounding objects, such as desktops and walls, as well as direct light from indicators on measuring instruments.

One hour of warm-up time should precede the measurements in 7.2, 9.2, 10.2, 11.2 and 14.2, unless otherwise specified by the manufacturer of the equipment.

To ensure optimal performance of a CRT display, it is essential that the mains voltage and frequency adhere to the manufacturer's specified rated values In cases of voltage fluctuations, utilizing a regulated power supply is crucial to keep the supply voltage within 5% of the rated value.

Other environmental conditions such as room temperature and relative humidity shall be reported together with the results of the measurements.

If additional environmental conditions are described in the manufacturer’s specifications, these should be taken into account.

To ensure accurate measurements of CRT displays, it is essential to set the contrast, brightness, and additional adjustments according to the manufacturer's specifications If these settings deviate from the recommended values, the actual positions must be documented alongside the measurement results For non-contact measurements, the equipment should be arranged as depicted in Figure 1, utilizing either a spectroradiometer or a non-contact colorimeter based on the specific characteristics being measured Additionally, the optical axis of the instrument must be perpendicular to the center of the CRT display's surface, with a minimum distance of 4 units maintained.

To ensure accurate measurements, it is essential to take precautions against vibrations and to avoid any missing picture elements within the measuring instrument's field of view.

Figure 1 illustrates the setup for non-contact measurements For contact measurements, the configuration must align with Figure 2, where a measurement probe is positioned on the surface of the cathode ray tube (CRT) screen.

(Sonde de mesure) (Corps principal)

Figure 2 – Disposition de l'équipement pour les mesures au contact

The equipment setup for non-contact measurements is illustrated in Figure 1, while Figure 2 depicts the configuration for contact measurements using colorimeters, where a measurement probe is positioned on the CRT face plate.

Figure 2 – Equipment arrangement for contact measurements

The test signals applied to the red, green, and blue channels must generate a color pattern on the screen that matches the size shown in Figure 3 The color pattern's position should be centered, as indicated in Figure 3, with the background luminance set to black unless otherwise specified.

Figure 3 – Dimension d'un motif de couleur e) La zone mesurée doit être une zone circulaire, centrée sur le motif de couleur, de diamètre compris entre 0,05het 0,15h.

If the diameter of the area does not meet the requirement for very large or very small displays, an alternative measurement condition may be applied.

Données numériques en entrée

La relation entre les données numériques en entrée, D R ,D V ,D B , de N bits par voie et le niveau de signal normalisé correspondant R,V ,B pour le calcul doit être la suivante:

B B ó un indice i indique le palier de mesure de rang i

Test signals for the red, green, and blue channels must produce a color patch on the CRT display, as illustrated in Figure 3 The color patch's center will be used for positioning, and the background should remain black unless specified otherwise.

Figure 3 – Size of a colour patch e) The measured area shall be a circular area, centred on the colour patch, with a diameter between 0,05hand 0,15h.

NOTE If the diameter of the area does not meet the requirement for extremely large or small CRT displays, another measure may be used.

Relationship between input digital data, D R , D G , D B , of N bits per channel and corresponding normalised signal level R, G, B for calculation shall be

D B where an index i denotes the i-th measurement step.

Spectroradiomètre

For accurate measurements, it is essential to use a spectroradiometer with the following specifications: a wavelength range of at least 380 nm to 780 nm, a field of view between 0.1° and 2.0°, a wavelength uncertainty of less than 0.5 nm across the entire range, a measurement step of 5 nm or less, a bandwidth of 5 nm or less, and a reproducibility of 0.001 in x and y, along with 0.5% in luminance (cd/m²) Additionally, the uncertainty should be 0.005 in x and y for red, green, blue, and white from a cathode ray tube display, with a luminance uncertainty of 4% (cd/m²).

(x ,y ) sont les coordonnées chromatiques CIE 1931.

NOTE 1 Il convient d'effectuer un étalonnage périodique avec une source étalon de répartition de puissance spectrale connue.

NOTE 2 De plus amples précisions techniques de conception, de caractérisation et d'étalonnage des spectroradiomètres figurent dans la CIE 63 et en [7].

NOTE 3 Il convient que le champ de vision soit choisi de même que la distance d, de sorte que la surface mesurée sur l'afficheur à tube cathodique satisfasse à 5.2 e).

Colorimètre

The colorimeter must meet the following specifications: a) measurement area (contact type) of 0.05h to 0.15h, where h is the effective height of the cathode ray tube display; b) field of view (non-contact type) ranging from 0.1° to 2.0°; c) spectral sensitivity in accordance with CIE 2 color equalization functions as defined in ISO/CIE 10527; d) reproducibility of 0.002 in x, y and 0.5% for luminance; e) uncertainty of 0.005 in x, y for red, green, blue, and white of the cathode ray tube display, and 4% in luminance (in cd/m²).

( x , y ) sont les coordonnées chromatiques CIE 1931 définies dans la CIE 15.2.

NOTE 1 Il convient que le champ de vision soit choisi, de même que la distance d, de sorte que la surface mesurée sur l’afficheur à tube cathodique (CRT) satisfasse à 5.2 e).

If the uncertainty from the colorimeter does not meet this recommendation, correction methods are available to enhance the accuracy of measurements on cathode ray displays (see references [1], [2], and [13]).

NOTE 3 Il convient que l'instrument soit étalonné périodiquement pour répondre à la recommandation d'incertitude donnée en e).

For accurate measurements, a spectroradiometer should be selected with the following key specifications: a wavelength range of 380 nm to 780 nm, a field of view between 0.1° and 2.0°, and a wavelength uncertainty of less than 0.5 nm across the entire range Additionally, it should have a scanning interval and bandpath of 5 nm or less, with a repeatability of 0.001 in x and y, and 0.5% in luminance (cd/m²) Finally, the instrument must ensure an uncertainty of 0.005 in x and y for red, green, blue, and white of a CRT, along with a luminance uncertainty of 4% (cd/m²).

The (x , y ) is the CIE 1931 chromaticity coordinate.

NOTE 1 Periodic calibration should be done with a standard source of known spectral power distribution.

NOTE 2 Further technical details of the design, characterisation, and calibration of spectroradiometers can be found in CIE 63 and [7].

NOTE 3 The field of view should be chosen, together with the distance d , so that the measured area on the CRT display meets the requirements of 5.2 e).

The colorimeter must meet specific specifications, including a measurement area of 0.05h to 0.15h, where h represents the effective screen height of the CRT display It should have a non-contact field of view ranging from 0.1° to 2.0° Additionally, the spectral responsivity must align with the CIE 2° color matching functions as outlined in ISO/CIE 10527 The device should exhibit a repeatability of 0.002 in both x and y dimensions, and 0.5% for luminance Finally, the uncertainty should be 0.005 in x and y for red, green, blue, and white colors of the CRT, with a luminance uncertainty of 4% measured in candela per square meter.

The (x , y ) is the CIE 1931 chromaticity coordinate defined in CIE 15.2.

NOTE 2 If the original uncertainty of the colorimeter does not meet this recommendation, correction methods are available to improve the accuracy for the CRT display measurement (See [1] and [2], and [13].)

NOTE 3 The instrument should be calibrated periodically to assure the uncertainty recommendation given in e).

Les lectures du colorimètre, X ,Y (cd/m 2 ),Z doivent être normalisées par le niveau de luminance d'une couleur neutre de crête (blanc) Y n (cd/m 2 ), comme suit:

If the colorimeter used for measurements does not meet the specified requirements, the specifications and model name of the equipment must be documented in a report, along with the measurement results.

Small angles of inclination of the measuring head in contact with the surface of cathode ray tubes can lead to significant chromaticity errors with certain instruments Therefore, it is essential to exercise caution.

NOTE 5 Il convient de tenir compte de la synchronisation du colorimètre et du cadencement de balayage de la présentation sur écran cathodique.

7 Caractéristiques spectrales et intensité des stimuli primaires et blanc

Caractéristiques à mesurer

Distributions spectrales de radiance et composantes trichromatiques correspondantes pour les trois couleurs primaires de crête, couleurs rouge, verte, bleue et pour le blanc.

Conditions de mesure

The equipment setup must align with Figure 1, which includes a spectroradiometer The color signal should be generated so that the color pattern is centered on the measurement screen Additionally, the numerical data for the background luminance must correspond to D R = 0.

Méthode de mesure

a) Les motifs de couleurs centrés doivent être produits en suivant les paliers de mesure comme le montre le tableau 1, ó M=2 N −1 et N est le nombre de bits par voie.

Tableau 1 – Données d'entrée pour couleurs primaires et blanc de crête

Rouge de crête Vert de crête Bleu de crête

The spectral radiance distributions, r(λ), v(λ), b(λ), and w(λ), for red, green, blue, and white peak images on a cathode ray tube display must be successively measured using a spectroradiometer across the wavelength range of 380 nm to 780 nm.

Readings of the colorimeter, X, Y (cd/m 2 ), Z shall be normalised by the luminance level of a peak neutral colour (white), Y n (cd/m 2 ), as follows;

If the colorimeter used for measurements does not meet the above specifications, the model name and specification of the equipment shall be reported together with the results of measurements.

Small tilt angles of the contact measuring head on cathode ray tube surfaces can cause significant chromaticity errors in certain instruments, highlighting the need for careful handling.

NOTE 5 Synchronisation of the colorimeter and scan timing of the CRT display should be taken into account.

7 Spectral characteristics and intensity of the primaries and white stimuli

Spectral radiance distributions and corresponding tristimulus values for the three peak primary colours, red – green – blue, as well as white.

For accurate measurement conditions, the equipment must be arranged as depicted in Figure 1, utilizing a spectroradiometer The color signal should be generated to ensure that the color patch is centered on the CRT display being measured Additionally, the digital data for the background must be set to D R = 0, D G = 0, and D B = 0.

7.3 Method of measurement a) The centred colour patches shall be generated following the measurement steps as shown in Table 1, where M =2 N −1 and N is the number of bits per channel.

Table 1 – Input data for peak primaries and white

Peak red Peak green Peak blue

The spectral radiance distributions for peak red, green, blue, and white images on the CRT display will be measured using a spectroradiometer across the wavelength range of 380 nm to 780 nm.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. c) Les lectures du spectroradiomètre, X C ,Y C ,Z C doivent aussi être notées, ó l'indice

Ccorrespond respectivement à R, V, B pour les couleurs primaires et à W pour le blanc de crête.

Présentation des résultats

The measured data for spectral radiance distributions must be recorded for the peak colors red, green, blue, and white The spectral radiance distributions, denoted as r(λ), v(λ), and b(λ), should be plotted for the respective peak colors red, green, and blue, as illustrated in Figure 4 Additionally, the spectroradiometer readings should include a colorimeter emulation function.

X , , , pour le rouge, le vert, le bleu et blanc de crête doivent être consignées sous forme de tableau, comme le montre le tableau 2.

Figure 4 – Exemple de répartitions de radiance spectrale; r(λ),v(λ) et b(λ)

Tableau 2 – Exemple de formulaire de compte rendu pour les couleurs en excitations maximales

Relation linéaire entre l'excitation d'entrée maximale et les composantes trichromatiques de sortie de la lumière.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. c) Readings of the spectroradiometer, X C , Y C , Z C shall also be noted, where the subscript

C corresponds to R, G, B for primary colours, and to W for the peak white, respectively.

The results of the spectral radiance distributions must be reported for the peak colors red, green, blue, and white Additionally, the spectral radiance distributions, denoted as \$r(\lambda)\$, \$g(\lambda)\$, and \$b(\lambda)\$, should be plotted for the peak colors red, green, and blue, as shown in Figure 4 Furthermore, the spectroradiometer readings with an emulation function of colorimeters, represented as \$X_C\$ and \$Y_C\$, should also be included.

Z C , for peak red, green, blue and white shall be reported as a table, as shown in Table 2.

Figure 4 – An example of the spectral radiance distributions; r(λ), g(λ), and b(λ)

Table 2 – Example of reporting form for colours in maximum excitations

Linear relation between maximum input excitation and the tristimulus values of light output.

Méthode de mesure

a) Les résultats de mesure rapportés en 7.4 doivent être utilisés pour obtenir les composantes trichromatiques pour caractériser les trois primaires, le rouge – le vert – le bleu, et le blanc.

La luminance en candela par mètre carré doit être normalisée comme suit pour le rouge, le vert, le bleu et le blanc en remplaỗant l'indice C par R, V, B, W ; n

The normalization factor $ Y_n $ represents the measured luminance value for peak white, as recorded in Table 2 Additionally, the CIE 1931 xy chromatic coordinates $ x_C $ and $ y_C $ must be calculated for the primary colors and white, as defined by CIE 15.2, where the index $ C $ corresponds to R, G, B for the primary colors, and W for white.

1 c) Les éléments d'une matrice 3 × 3, S, définis comme suit:

(1) doivent être fixés comme dans:

S ó S R ,S V ,S B sont des solutions de l'équation (2);

a) Les composantes trichromatiques multipliées par 100 et les valeurs de coordonnées chromatiques CIE 1931 xy doivent être consignées sous forme de tableau, comme l'indique le tableau 3.

The measurement results reported in section 7.4 will be utilized to derive tristimulus values for the primary colors red, green, blue, and white The luminance, measured in candela per square meter, will be normalized for each color by substituting the subscript C with R, G, B, and W respectively.

The normalization factor $ Y_n $ represents the measured luminance value for peak white, as detailed in Table 2 The CIE 1931 xy chromaticity coordinate values $ x_C $ and $ y_C $ must be calculated for primary colors and white, following the definitions in CIE 15.2, where the subscript $ C $ denotes R, G, B for primary colors, and W for white.

' ' ' ' c) The elements of a 3 × 3 matrix, S, defined as

(1) shall be decided as in

S where S R , S G , S B are solutions of equation (2);

8.3 Presentation of results a) The tristimulus values multiplied by 100 and the CIE 1931xy chromaticity coordinate values shall be reported as a table, as shown in Table 3.

Tableau 3 – Exemple de formulaire de compte rendu

NOTE Les valeurs de coordonnées de diagramme de chromaticité uniforme (UCS) CIE 1976, u′,v′, et les valeurs

CIELAB, L * ,a * ,b * peuvent être ajoutées au rapport. b) La matrice du coefficient doit être consignée comme suit:

The proximal color temperature T cp, as defined in section 5.5 of CIE 15.2, must be calculated and recorded in kelvins for the peak white, along with the divergence δuv.

NOTE Pour connaợtre la procộdure recommandộe pour calculer les tempộratures de couleurs proximales, se reporter à [18].

La relation de transfert non linéaire entre le niveau de signal d'entrée normalisé R,V,B appliqué à chacune des voies rouge, verte et bleue et le niveau de luminance normalisé

R d'une présentation sur écran cathodique, exprimée respectivement par les formules de modèles suivantes:

The coefficients $ k_g $ and $ k_o $ represent the gain and damping for each channel, respectively The values $ R_o, V_o, B_o $ are normalized light damping values for zero inputs in their respective channels Additionally, the parameter $ \gamma $ indicates the non-linearity of the transfer relationship.

Table 3 – Example of reporting form

NOTE CIE 1976 UCS coordinate values, u′, v′, and CIELAB values, L*, a*, b* may additionally be reported. b) The coefficient matrix shall be reported as follows:

S c) The correlated colour temperature T cp defined in 5.5 of CIE 15.2, for peak white shall also be calculated and reported in kelvins, together with the deviation δuv.

NOTE For the recommended procedure to calculate correlated colour temperatures, refer to [18].

The non-linear transfer relationship between the normalized input signal levels for the red, green, and blue channels (R, G, B) and the corresponding normalized luminance levels (R′, G′, B′) of a CRT display is described by specific model formulas.

The coefficients $ k_g $ and $ k_o $ represent the gain and offset for each channel, while $ R_o $, $ G_o $, and $ B_o $ denote the normalized light offsets for zero inputs in their respective channels Additionally, the parameter $ \gamma $ indicates the non-linearity of the transfer relation.

a) Il convient que la disposition de l'équipement soit conforme à la figure 1 ou la figure 2. b) Les données d'entrée i i i D D

For the measurement level i, D R, V, and B must be applied to create color patterns centered on the CRT display during measurement (refer to Figure 3) Additionally, the input data for the background luminance must be accurately matched.

NOTE Se reporter à 5.3 pour la relation entre les données numériques i i i D D

Méthode de mesure

a) Les motifs de couleurs au centre doivent être affichés pour 17 valeurs de données d'entrée de 0 2 , 2 ,

In a color measurement system, the maximum number of colors is given by $ M = 2^N - 1 $, where $ N $ represents the number of bits per channel For accurate measurements, the red channel must maintain $ D_V = D_B = 0 $, the green channel must have $ D_R = D_B = 0 $, and the blue channel must ensure $ D_R = D_V = 0 $ Additionally, the colorimeter readings for each color pattern on the CRT should reflect the trichromatic components, measured sequentially and recorded as $ X_{C_i}, Y_{C_i}, Z_{C_i} $ Here, the index $ C $ is replaced with $ R $, $ V $, and $ B $ for the red, green, and blue channels, respectively, while the exponent $ i $ denotes the measurement levels.

0 i c) Les valeurs mesurées doivent être normalisées par les valeurs correspondant à l'excitation maximale pour le dernier palier 16 avec les données d'entrée M =2 N −1.

B Z i i d) Les coefficients de l'équation (3) doivent être estimés par une régression non linéaire selon les jeux de données mesurés et normalisés.

a) Les paramètres calculés, ainsi que le facteur de normalisation,L 16 , doivent être consignés comme au tableau 4, en utilisant la méthode de régression non linéaire.

Tableau 4 – Exemple de paramètres calculés et de facteurs de normalisation

Voie Puissance ( γ ) Gain ( k g ) Amorỗage d'entrộe ( k o ) Amorỗage de sortie ( C o ) Normalisation

For accurate measurement conditions, the equipment must be arranged as depicted in Figure 1 or Figure 2 The input data for measurement step $i$, specifically $D_{R_i}$, $D_{G_i}$, and $D_{B_i}$, should be applied to create color patches centered on the CRT display screen, as illustrated in Figure 3 Additionally, the digital input data for the background must be set to $D_R = 0$, $D_G = 0$, and $D_B = 0$.

NOTE For relation between digital data i i i D D

D R , G , B and values of R i , G i , B i , see the equation in 5.3.

9.3 Method of measurement a) The centred colour patches shall be displayed for 17 values of input data from

The relationship between the number of bits per channel (N) and the total number of colors (M) is given by the equation $ M = 2^N $ For accurate color measurements, the readings for the red channel should have $ D_G = D_B = 0 $, while for the green channel, $ D_R = D_B = 0 $, and for the blue channel, $ D_R = D_G = 0 $ The colorimeter will provide tristimulus values for each color patch measured.

CRT display, and shall be measured successively by the colorimeter and noted as i

The measured values for the red, green, and blue channels, denoted as $X_R$, $X_G$, and $X_B$, will be taken at measurement steps $i = 0, 1, 2, \ldots, 16$ These values will be normalized based on the maximum excitation recorded at the final step, $i = 16$, using input data defined as $M = 2^N - 1$.

B Z i i d) The coefficients in equation (3) shall be estimated by a non-linear regression to the measured and normalised sets of data.

9.4 Presentation of results a) The calculated parameters, together with the normalisation factor, L 16 , shall be reported as in Table 4 together with the non-linear regression method used.

Table 4 – An example of calculated parameters and normalisation factors

Channel Power ( γ ) Gain ( k g ) Input offset

Licensed to MECON Limited for internal use in Ranchi and Bangalore, supplied by Book Supply Bureau Additionally, the foundational data for the red, green, and blue pathways must be recorded in tables, similar to the format used in Table 5.

Tableau 5 – Exemple d'ensemble de données de base pour caractéristiques de niveaux

The measured and normalized data $ R'_i, V'_i, B'_i $ for $ i = 0 $ to $ i $ should be recorded in the form of plots, utilizing nonlinear transfer functions calculated in equations (3) and (4), as illustrated in Figure 5.

NOTE Dans les graphes bilogarithmiques, on ne tient pas compte des valeurs zéro aussi bien en ordonné qu'en abscisse.

The basic data for the red, green, and blue channels will be presented in tables, as illustrated in Table 5 This information is provided exclusively for internal use at the Ranchi/Bangalore location, under the license of MECON Limited and supplied by the Book Supply Bureau.

Table 5 – An example set of basic data for tone characteristics

255 30,4866 15,6000 1,4744 22,8458 49,2000 9,5463 15,3157 6,0400 86,5014 c) The measured and normalised data R′ i , G′ i , B′ i for i= 0 to i= 16 shall be reported as plots with calculated non-linear transfer functions defined in equations (3) and (4), as shown in

NOTE In the log-log plots, all zero values, either on ordinate or abscissa, are disregarded.

S o rt ie d e l u m ièr e n o rm ali s ée

Niveau d’entrée normalisé R Voie rouge

Sor tie de lu miè re nor ma li s é e

Niveau d’entrée normalisé V Voie verte

Niveau d’entrée normalisé B Voie bleue

Figure 5 – Points mesurés et courbes non linéaires estimées sur des échelles linéaires et bilogarithmiques

Normalised input level R Red channel

Normalised input level G Green channel

Normalised input level B Blue channel

Figure 5 – Measured points and estimated non-linear curves on linear and log-log scales

Relation inter-voie entre les données d'entrée et les composantes trichromatiques, X′,Y′,Z′, des couleurs affichées.

La relation dépendant de l'interaction des voies doit être définie comme suit:

In Article 9, the variables R′, V′, and B′ are defined as dependent on the input data D R, D V, and D B, respectively The dependent variables X′, Y′, and Z′ represent the measured and normalized trichromatic components of the output light, as outlined in section 8.2 Equation (5) involves matrices S and T, which are defined as 3 × 3 and 3 × 8 matrices, respectively.

NOTE La matrice S est la relation dominante obtenue et consignée en 8.3 et la matrice T définit les relations de voies croisées parmi les voies rouge, verte et bleue.

The equipment layout must adhere to either Figure 1 or Figure 2 The color signal should be applied to create the color pattern displayed at the center of the cathode ray tube screen during measurement The input data for the background luminance must be set to D R = 0, D V = 0, and D B = 0.

Méthode de mesure

Color-centered patterns must be presented with input data according to measurement levels, as illustrated in Table 6 for 32 colors The normalized trichromatic components $X_i', Y_i', Z_i'$ for $i = 1$ to $i = 32$ for all color patterns on the cathode ray tube display should be measured sequentially using a colorimeter.

Inter-channel relationship between input data and tristimulus values, X′, Y′, Z′, of displayed colours.

The relationship depending upon channel interaction shall be defined as follows:

S (5) where the variables R′, G′, B′ are defined in clause 9 as dependent on input data D R , D G ,

D B, respectively, and dependent variables X′, Y′, Z′ are measured and normalised tristimulus values of light output, as in 8.2 In equation (5), S and T are 3 × 3 and 3 × 8 matrices defined respectively as follows,

NOTE The matrix S is the dominant relation obtained and reported in 8.3, and the matrix T defines inter- channel relations among red, green and blue channels.

To ensure accurate measurement conditions, the equipment must be arranged as depicted in Figure 1 or Figure 2 The color signal should be applied to create a color patch located at the center of the CRT display being measured Additionally, the input data for the background must be set to D R = 0, D G = 0, and D B = 0.

The measurement method involves displaying centered color patches using input data, adhering to the steps outlined in Table 6 for 32 colors The normalized tristimulus values $X_i', Y_i', Z_i'$ for each color patch on the CRT display, where $i$ ranges from 1 to 32, will be sequentially measured using a colorimeter.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. c) Les données R i ′,V i ′,B i ′, correspondant aux i i i D D

D R , V , B du tableau 6, doivent être calculées pour i = 1 à i = 32 en substituant les paramètres consignés des caractéristiques de tonalités dans les équations (3) et (4) en 9.1.

Tableau 6 – Entrées numériques pour produire des motifs de couleurs pour la mesure de la dépendance inter-voie

Dans le tableau 6, les valeurs des données D k doivent être les suivantes:

0 k k pour pour ó N est le nombre de bits par voie.

The data values R′ i, G′ i, and B′ i, which correspond to D R i, D G i, and D B i as shown in Table 6, will be computed for i ranging from 1 to 32 by substituting the reported tone characteristics parameters into the specified equations.

Table 6 – Digital inputs to generate colour patches for measurement of inter-channel dependency

In Table 6, the values of data D k shall be

N k for for where N is the number of bits for each channel.

a) Les valeurs de la matrice des coefficients T définies dans l'équation (5) doivent être calculées par l'équation suivante:

A D b) La matrice doit être consignée selon le modèle ci-dessous:

T c) Les données mesurées doivent aussi être consignées, comme le montre le tableau 7.

10.4 Presentation of results a) The values of coefficient matrix T defined in equation (5) shall be calculated by the following equation.

D b) The matrix shall be reported as shown below.

T c) The measured data shall also be reported as shown in Table 7.

Tableau 7 – Exemple de composantes trichromatiques normalisées (matrice A) i X′ Y′ Z′

La non-uniformité de clarté (voir la CEI 60050(845-03-54) et (845-03-56) et les coordonnées chromatiques sur tout l'écran de l’afficheur à tube cathodique (CRT).

Il convient que la disposition de l'équipement soit conforme à la figure 2.

Table 7 – Example of normalised tristimulus values (the matrix A) i X′ Y′ Z′

The non-uniformity of lightness (see IEC 60050(845-03-54) and (845-03-56)) and chromaticity coordinates over the entire CRT display screen.

The arrangement of equipment should be as in Figure 2.

Méthode de mesure

To display white across the entire presentation surface on a cathode ray screen, the data D R = M, D V = M, and D B = M must be applied, where M = 2N - 1 and N represents the number of bits per channel Additionally, the trichromatic components, X_i, Y_i, and Z_i, should be measured using a 25-point colorimeter, as illustrated in Figure 6.

No.1 No.2 No.3 No.4 No.5

No.11 No.12 No.13 No.14 No.15

No.16 No.17 No.18 No.19 No.20

No.21 No.22 No.23 No.24 No.25 w/5 w/5 w/5 w/5 h/5 h/5 h/5 h/5 h/10 h/10 h w/10 w/10 w

IEC 240/2000 h: hauteur effective d’écran w: largeur effective d’écran

Figure 6 – Points de mesure pour la non-uniformité spatiale c) Les différences de couleurs suivantes dans la CIE 1976 USC et dans l’espace chromatique

CIE 1976 L * a * b * doivent être calculées avec des données de référence X 13 ,Y 13 ,Z 13 qui correspondent au centre de l’afficheur à tube cathodique.

∆ ó u′,v′et L * ,a * ,b * sont définis par la CIE 15.2 comme suit:

The measurement method involves applying the data D R = M, D G = M, and D B = M to achieve a uniform white display across the entire CRT surface, where M is defined as 2^N - 1, with N representing the number of bits per channel Additionally, tristimulus values X_i, Y_i, and Z_i will be measured at 25 specific points using a colorimeter.

No.11 No.12 No.13 No.14 No.15

No.16 No.17 No.18 No.19 No.20

No.21 No.22 No.23 No.24 No.25 w/5 w/5 w/5 w/5 h/5 h/5 h/5 h/5 h/10 h/10 h w/10 w/10 w

IEC 240/2000 h : Effective screen height w : Effective screen width

The colour differences in the CIE 1976 UCS and CIE 1976 L * a * b * colour space will be calculated based on the reference data X 13, Y 13, and Z 13, which represent the center of the CRT display.

∆ ′ where u′,v′ and L*, *a , *b are defined by CIE 15.2 as:

NOTE Ces équations sont valables pour 0,008856

The calculated results, ∆u′, ∆v′, ∆u′v′, ∆L*, and ∆C* for 1≤i≤25, should be recorded as non-uniformity indices, as illustrated in Table 8 For the interpretation and requirements regarding the values of ∆u′v′, refer to ISO 9241-8.

Tableau 8 – Exemple de formulaire de rapport

NOTE These equations are valid for 0,008856

The calculated indices of non-uniformity, including ∆u′, ∆v′, ∆u′v′, ∆L*, and ∆C ab*, for the range of 1 ≤ i ≤ 25, will be presented in Table 8 For the interpretation and requirements regarding the values of ∆u′v′, please refer to ISO 9241-8.

Stabilité à court terme

Stabilité de reproduction de couleur lors de la première application d'énergie à l’afficheur à tube cathodique.

The equipment layout should adhere to either Figure 1 or Figure 2 The cathode ray tube (CRT) display must be powered off for more than 2 hours prior to measurement The initial reading should be recorded 1 minute after the CRT is powered on.

Méthode de mesure

To achieve a uniform white color across the entire surface of a cathode ray tube display, the input data D R = M, D V = M, D B = M must be applied, where M = 2N - 1 and N represents the number of bits per channel The luminance Y, measured in candelas per square meter, along with the chromatic coordinates y and x from the CIE 1931 standard, should be recorded at the center of the screen every minute for a duration of 2 hours The average luminance Y over time must be calculated accordingly.

Environmental conditions

All measurements outlined in this standard must be conducted in an environment devoid of significant electromagnetic interference Except for the measurements specified in clause 13, all tests should take place in a dark room It is crucial to minimize reflected light from surrounding objects, such as desks and walls, as well as direct light from the indicators of measuring instruments.

One hour of warm-up time should precede the measurements in 7.2, 9.2, 10.2, 11.2 and 14.2, unless otherwise specified by the manufacturer of the equipment.

To ensure optimal performance of a CRT display, the mains voltage and frequency must align with the manufacturer's specified ratings In cases of voltage fluctuations, it is essential to utilize a regulated power supply to keep the supply voltage within 5% of the rated value.

Other environmental conditions such as room temperature and relative humidity shall be reported together with the results of the measurements.

If additional environmental conditions are described in the manufacturer’s specifications, these should be taken into account.

Conditions of measurements

To ensure accurate measurements of CRT displays, contrast, brightness, and other adjustments must align with the manufacturer's specifications If adjustments deviate from these specifications, the actual settings should be documented alongside the measurement results For non-contact measurements, the equipment should be arranged as depicted in Figure 1, utilizing either a spectroradiometer or a non-contact colorimeter based on the specific characteristics being measured It is essential that the instrument's optical axis is perpendicular to the center of the CRT display's surface, with a minimum distance of 4 units maintained.

To ensure accurate measurements, it is essential to take precautions against vibrations and to ensure that no picture elements are absent from the measuring instrument's field of view.

Figure 1 illustrates the setup for non-contact measurements For contact measurements, the configuration must adhere to Figure 2, where a measurement probe is positioned on the surface of the cathode ray tube (CRT) screen.

(Sonde de mesure) (Corps principal)

Figure 2 – Disposition de l'équipement pour les mesures au contact

The equipment setup for non-contact measurements is illustrated in Figure 1, while Figure 2 depicts the configuration for contact measurements using colorimeters, where a measurement probe is positioned on the CRT face plate.

Figure 2 – Equipment arrangement for contact measurements

The test signals applied to the red, green, and blue channels must generate a color pattern on the screen that matches the size shown in Figure 3 The color pattern's position should be centered, as indicated in Figure 3, with the background luminance set to black unless otherwise specified.

Figure 3 – Dimension d'un motif de couleur e) La zone mesurée doit être une zone circulaire, centrée sur le motif de couleur, de diamètre compris entre 0,05het 0,15h.

If the diameter of the area does not meet the requirement for very large or very small displays, an alternative measurement condition may be applied.

La relation entre les données numériques en entrée, D R ,D V ,D B , de N bits par voie et le niveau de signal normalisé correspondant R,V ,B pour le calcul doit être la suivante:

B B ó un indice i indique le palier de mesure de rang i

Test signals for the red, green, and blue channels should produce a color patch of the specified size on the CRT display, with the center of the patch indicated as shown in Figure 3 The background must remain black unless stated otherwise.

Figure 3 – Size of a colour patch e) The measured area shall be a circular area, centred on the colour patch, with a diameter between 0,05hand 0,15h.

NOTE If the diameter of the area does not meet the requirement for extremely large or small CRT displays, another measure may be used.

Input digital data

Relationship between input digital data, D R , D G , D B , of N bits per channel and corresponding normalised signal level R, G, B for calculation shall be

D B where an index i denotes the i-th measurement step.

For accurate measurements, it is essential to use a spectroradiometer with the following specifications: a wavelength range of at least 380 nm to 780 nm, a field of view between 0.1° and 2.0°, a wavelength uncertainty of less than 0.5 nm across the entire range, a measurement step of 5 nm or less, a bandwidth of 5 nm or less, and a reproducibility of 0.001 in x and y, along with 0.5% in luminance (cd/m²) Additionally, the uncertainty should be 0.005 in x and y for red, green, blue, and white from a cathode ray tube display, with a luminance uncertainty of 4% (cd/m²).

(x ,y ) sont les coordonnées chromatiques CIE 1931.

NOTE 1 Il convient d'effectuer un étalonnage périodique avec une source étalon de répartition de puissance spectrale connue.

NOTE 2 De plus amples précisions techniques de conception, de caractérisation et d'étalonnage des spectroradiomètres figurent dans la CIE 63 et en [7].

NOTE 3 Il convient que le champ de vision soit choisi de même que la distance d, de sorte que la surface mesurée sur l'afficheur à tube cathodique satisfasse à 5.2 e).

The colorimeter must meet the following specifications: a) measurement area (contact type) of 0.05h to 0.15h, where h is the effective height of the cathode ray tube display; b) field of view (non-contact type) ranging from 0.1° to 2.0°; c) spectral sensitivity in accordance with CIE 2 color equalization functions as defined in ISO/CIE 10527; d) reproducibility of 0.002 in x, y and 0.5% for luminance; e) uncertainty of 0.005 in x, y for red, green, blue, and white of the cathode ray tube display, and 4% in luminance (in cd/m²).

( x , y ) sont les coordonnées chromatiques CIE 1931 définies dans la CIE 15.2.

NOTE 1 Il convient que le champ de vision soit choisi, de même que la distance d, de sorte que la surface mesurée sur l’afficheur à tube cathodique (CRT) satisfasse à 5.2 e).

If the uncertainty from the colorimeter does not meet the recommended standards, correction methods are available to enhance the accuracy of measurements on cathode ray displays (see references [1], [2], and [13]).

NOTE 3 Il convient que l'instrument soit étalonné périodiquement pour répondre à la recommandation d'incertitude donnée en e).

Spectroradiometer

For accurate measurements, a spectroradiometer should be selected with specific features: a wavelength range from 380 nm to 780 nm, a field of view between 0.1° and 2.0°, and a wavelength uncertainty of less than 0.5 nm across the entire range Additionally, it should have a scanning interval and bandpath of 5 nm or less, with a repeatability of 0.001 in x and y, and 0.5% in luminance (cd/m²) Finally, the instrument must ensure an uncertainty of 0.005 in x and y for red, green, blue, and white of a CRT, along with a 4% uncertainty in luminance (cd/m²).

The (x , y ) is the CIE 1931 chromaticity coordinate.

NOTE 1 Periodic calibration should be done with a standard source of known spectral power distribution.

NOTE 2 Further technical details of the design, characterisation, and calibration of spectroradiometers can be found in CIE 63 and [7].

Colorimeter

The colorimeter must meet specific specifications, including a measurement area of 0.05h to 0.15h (where h represents the effective screen height of the CRT display) for contact types, and a non-contact field of view ranging from 0.1° to 2.0° It should also exhibit spectral responsivity in accordance with the CIE 2° color matching functions as outlined in ISO/CIE 10527 Additionally, the device should demonstrate a repeatability of 0.002 in x and y, and 0.5% for luminance, along with an uncertainty of 0.005 in x and y for red, green, blue, and white colors of the CRT, and 4% in luminance measured in candela per square meter.

The (x , y ) is the CIE 1931 chromaticity coordinate defined in CIE 15.2.

NOTE 2 If the original uncertainty of the colorimeter does not meet this recommendation, correction methods are available to improve the accuracy for the CRT display measurement (See [1] and [2], and [13].)

NOTE 3 The instrument should be calibrated periodically to assure the uncertainty recommendation given in e).

Les lectures du colorimètre, X ,Y (cd/m 2 ),Z doivent être normalisées par le niveau de luminance d'une couleur neutre de crête (blanc) Y n (cd/m 2 ), comme suit:

If the colorimeter used for measurements does not meet the specified requirements, the specifications and model name of the equipment must be documented in a report, along with the measurement results.

Small angles of inclination of the measuring head in contact with the surface of cathode ray tubes can lead to significant chromaticity errors with certain instruments Therefore, it is important to exercise caution.

NOTE 5 Il convient de tenir compte de la synchronisation du colorimètre et du cadencement de balayage de la présentation sur écran cathodique.

7 Caractéristiques spectrales et intensité des stimuli primaires et blanc

Distributions spectrales de radiance et composantes trichromatiques correspondantes pour les trois couleurs primaires de crête, couleurs rouge, verte, bleue et pour le blanc.

The measurement conditions require that the equipment setup aligns with Figure 1, which includes a spectroradiometer The color signal must be generated so that the color pattern is centered on the measurement screen Additionally, the numerical data for the background luminance should be set to D R = 0.

The measurement method requires that the centered color patterns be generated according to the measurement levels outlined in Table 1, where $ M = 2^N - 1 $ and $ N $ represents the number of bits per channel.

Tableau 1 – Données d'entrée pour couleurs primaires et blanc de crête

Rouge de crête Vert de crête Bleu de crête

The spectral radiance distributions for red, green, blue, and white peak images on a cathode ray tube display must be successively measured using a spectroradiometer across the wavelength range of 380 nm to 780 nm.

Readings of the colorimeter, X, Y (cd/m 2 ), Z shall be normalised by the luminance level of a peak neutral colour (white), Y n (cd/m 2 ), as follows;

If the colorimeter used for measurements does not meet the above specifications, the model name and specification of the equipment shall be reported together with the results of measurements.

Small tilt angles of the contact measuring head on cathode ray tube surfaces can cause significant chromaticity errors in certain instruments, highlighting the need for careful handling.

NOTE 5 Synchronisation of the colorimeter and scan timing of the CRT display should be taken into account.

7 Spectral characteristics and intensity of the primaries and white stimuli

Characteristics to be measured

Spectral radiance distributions and corresponding tristimulus values for the three peak primary colours, red – green – blue, as well as white.

Measurement conditions

The equipment setup must follow the configuration shown in Figure 1, which includes a spectroradiometer It is essential that the color signal is generated to ensure the color patch is centered on the CRT display being measured Additionally, the digital data for the background should be set to D R = 0, D G = 0, and D B = 0.

Method of measurement

a) The centred colour patches shall be generated following the measurement steps as shown in Table 1, where M =2 N −1 and N is the number of bits per channel.

Table 1 – Input data for peak primaries and white

Peak red Peak green Peak blue

The spectral radiance distributions for peak red, green, blue, and white images on the CRT display will be measured using a spectroradiometer across the wavelength range of 380 nm to 780 nm.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. c) Les lectures du spectroradiomètre, X C ,Y C ,Z C doivent aussi être notées, ó l'indice

Ccorrespond respectivement à R, V, B pour les couleurs primaires et à W pour le blanc de crête.

The measured data for spectral radiance distributions must be recorded for the peak colors red, green, blue, and white Spectral radiance distributions, denoted as r(λ), v(λ), and b(λ), should be plotted for the respective peak colors red, green, and blue, as illustrated in Figure 4 Additionally, spectroradiometer readings should include a colorimeter emulation function.

X , , , pour le rouge, le vert, le bleu et blanc de crête doivent être consignées sous forme de tableau, comme le montre le tableau 2.

Figure 4 – Exemple de répartitions de radiance spectrale; r(λ),v(λ) et b(λ)

Tableau 2 – Exemple de formulaire de compte rendu pour les couleurs en excitations maximales

Relation linéaire entre l'excitation d'entrée maximale et les composantes trichromatiques de sortie de la lumière.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. c) Readings of the spectroradiometer, X C , Y C , Z C shall also be noted, where the subscript

C corresponds to R, G, B for primary colours, and to W for the peak white, respectively.

Presentation of results

The spectral radiance distributions for peak colors—red, green, blue, and white—must be reported Additionally, the distributions for red, green, and blue should be plotted as shown in Figure 4 The spectroradiometer readings, which include the emulation function of colorimeters, are represented by $X_C$ and $Y_C$.

Z C , for peak red, green, blue and white shall be reported as a table, as shown in Table 2.

Figure 4 – An example of the spectral radiance distributions; r(λ), g(λ), and b(λ)

Table 2 – Example of reporting form for colours in maximum excitations

Linear relation between maximum input excitation and the tristimulus values of light output.

The measurement results reported in section 7.4 should be utilized to derive the trichromatic components that characterize the three primary colors: red, green, and blue, along with white.

La luminance en candela par mètre carré doit être normalisée comme suit pour le rouge, le vert, le bleu et le blanc en remplaỗant l'indice C par R, V, B, W ; n

The normalization factor $ Y_n $ represents the measured luminance value for peak white, as recorded in Table 2 Additionally, the CIE 1931 xy chromatic coordinates $ x_C $ and $ y_C $ must be calculated for the primary colors and white, as defined by CIE 15.2, where the index $ C $ corresponds to R, G, B for the primary colors, and W for white.

1 c) Les éléments d'une matrice 3 × 3, S, définis comme suit:

(1) doivent être fixés comme dans:

S ó S R ,S V ,S B sont des solutions de l'équation (2);

8.3 Présentation des résultats a) Les composantes trichromatiques multipliées par 100 et les valeurs de coordonnées chromatiques CIE 1931 xy doivent être consignées sous forme de tableau, comme l'indique le tableau 3.

The measurement results reported in section 7.4 will be utilized to derive tristimulus values for the primary colors red, green, blue, and white The luminance, measured in candela per square meter, will be normalized for each color by substituting the subscript C with R, G, B, and W respectively.

The normalization factor $ Y_n $ represents the measured luminance value for peak white, as detailed in Table 2 The CIE 1931 xy chromaticity coordinate values $ x_C $ and $ y_C $ must be calculated for primary colors and white, following the definitions in CIE 15.2, where the subscript $ C $ denotes R, G, B for primary colors, and W for white.

' ' ' ' c) The elements of a 3 × 3 matrix, S, defined as

(1) shall be decided as in

S where S R , S G , S B are solutions of equation (2);

a) The tristimulus values multiplied by 100 and the CIE 1931xy chromaticity coordinate values shall be reported as a table, as shown in Table 3.

Tableau 3 – Exemple de formulaire de compte rendu

NOTE Les valeurs de coordonnées de diagramme de chromaticité uniforme (UCS) CIE 1976, u′,v′, et les valeurs

CIELAB, L * ,a * ,b * peuvent être ajoutées au rapport. b) La matrice du coefficient doit être consignée comme suit:

The proximal color temperature T cp, as defined in section 5.5 of CIE 15.2, must be calculated and recorded in kelvins for the peak white, along with the divergence δuv.

NOTE Pour connaợtre la procộdure recommandộe pour calculer les tempộratures de couleurs proximales, se reporter à [18].

La relation de transfert non linéaire entre le niveau de signal d'entrée normalisé R,V,B appliqué à chacune des voies rouge, verte et bleue et le niveau de luminance normalisé

R d'une présentation sur écran cathodique, exprimée respectivement par les formules de modèles suivantes:

The coefficients $ k_g $ and $ k_o $ represent the gain and offset for each channel, respectively The values $ R_o, V_o, B_o $ are normalized light offset values for zero inputs in their respective channels Additionally, the parameter $ \gamma $ indicates the non-linearity of the transfer relationship.

NOTE CIE 1976 UCS coordinate values, u′, v′, and CIELAB values, L*, a*, b* may additionally be reported. b) The coefficient matrix shall be reported as follows:

S c) The correlated colour temperature T cp defined in 5.5 of CIE 15.2, for peak white shall also be calculated and reported in kelvins, together with the deviation δuv.

NOTE For the recommended procedure to calculate correlated colour temperatures, refer to [18].

The non-linear transfer relationship between the normalized input signal levels for the red, green, and blue channels (R, G, B) and the corresponding normalized luminance levels (R′, G′, B′) of a CRT display can be expressed through specific model formulas.

The coefficients $ k_g $ and $ k_o $ represent the gain and offset for each channel, while $ R_o $, $ G_o $, and $ B_o $ denote the normalized light offsets for zero inputs in their respective channels Additionally, the parameter $ \gamma $ indicates the non-linearity of the transfer relation.

9.2 Conditions de mesure a) Il convient que la disposition de l'équipement soit conforme à la figure 1 ou la figure 2. b) Les données d'entrée i i i D D

To generate color patterns centered on the CRT display during measurement, the parameters D R, V, and B for the measurement level i must be applied accordingly Additionally, the input data for the background luminance should be accurately matched.

NOTE Se reporter à 5.3 pour la relation entre les données numériques i i i D D

9.3 Méthode de mesure a) Les motifs de couleurs au centre doivent être affichés pour 17 valeurs de données d'entrée de 0 2 , 2 ,

In a color measurement system, the maximum value is defined as $ M = 2^N - 1 $, where $ N $ represents the number of bits per channel For accurate measurements, the red channel must maintain $ D_V = D_B = 0 $, the green channel must have $ D_R = D_B = 0 $, and the blue channel must ensure $ D_R = D_V = 0 $ Additionally, the colorimeter readings for each color pattern on the CRT should reflect the trichromatic components, measured sequentially and recorded as $ X_{C_i}, Y_{C_i}, Z_{C_i} $ Here, the index $ C $ is replaced with $ R $, $ V $, and $ B $ for the red, green, and blue channels, respectively, while the exponent $ i $ denotes the measurement levels.

0 i c) Les valeurs mesurées doivent être normalisées par les valeurs correspondant à l'excitation maximale pour le dernier palier 16 avec les données d'entrée M =2 N −1.

B Z i i d) Les coefficients de l'équation (3) doivent être estimés par une régression non linéaire selon les jeux de données mesurés et normalisés.

9.4 Présentation des résultats a) Les paramètres calculés, ainsi que le facteur de normalisation,L 16 , doivent être consignés comme au tableau 4, en utilisant la méthode de régression non linéaire.

Tableau 4 – Exemple de paramètres calculés et de facteurs de normalisation

Voie Puissance ( γ ) Gain ( k g ) Amorỗage d'entrộe ( k o ) Amorỗage de sortie ( C o ) Normalisation

For optimal measurement, the equipment should be arranged as depicted in Figure 1 or Figure 2 During the measurement step $i$, the input data $D_{R_i}, D_{G_i}, D_{B_i}$ must be applied to create color patches that are centered on the CRT display screen (refer to Figure 3) Additionally, the digital input data for the background should be set to $D_R = 0$, $D_G = 0$, and $D_B = 0$.

NOTE For relation between digital data i i i D D

D R , G , B and values of R i , G i , B i , see the equation in 5.3.

a) The centred colour patches shall be displayed for 17 values of input data from

The relationship between the number of bits per channel, denoted as $ N $, and the total number of measurements is given by the equation $ 1 N N , to 1M =2 N − $ For accurate color channel measurements, the values for the red and green channels should be set to $ D G = D B = 0 $ and $ D R = D B = 0 $, respectively, while the blue channel should maintain $ D R = D G = 0 $ Additionally, the colorimeter readings will provide tristimulus values for each color patch analyzed.

CRT display, and shall be measured successively by the colorimeter and noted as i

The measured values for the red, green, and blue channels, denoted as $X_R$, $X_G$, and $X_B$, will be taken at measurement steps $i = 0, 1, 2, \ldots, 16$ These values will be normalized based on the maximum excitation recorded at the final step, $i = 16$, with input data defined as $M = 2^N - 1$.

B Z i i d) The coefficients in equation (3) shall be estimated by a non-linear regression to the measured and normalised sets of data.

a) The calculated parameters, together with the normalisation factor, L 16 , shall be reported as in Table 4 together with the non-linear regression method used.

Table 4 – An example of calculated parameters and normalisation factors

Channel Power ( γ ) Gain ( k g ) Input offset

Licensed to MECON Limited for internal use in Ranchi and Bangalore, supplied by Book Supply Bureau Additionally, the foundational data for the red, green, and blue pathways must be recorded in tables, similar to the format used in Table 5.

Tableau 5 – Exemple d'ensemble de données de base pour caractéristiques de niveaux

The measured and normalized data R' i, V' i, B' i for i ranging from 0 to i should be recorded in the form of plots, utilizing nonlinear transfer functions calculated in equations (3) and (4), as illustrated in Figure 5.

NOTE Dans les graphes bilogarithmiques, on ne tient pas compte des valeurs zéro aussi bien en ordonné qu'en abscisse.

The basic data for the red, green, and blue channels will be presented in tables, as illustrated in Table 5 This information is licensed to MECON Limited for internal use at the Ranchi and Bangalore locations, and it is supplied by the Book Supply Bureau.

Table 5 – An example set of basic data for tone characteristics

255 30,4866 15,6000 1,4744 22,8458 49,2000 9,5463 15,3157 6,0400 86,5014 c) The measured and normalised data R′ i , G′ i , B′ i for i= 0 to i= 16 shall be reported as plots with calculated non-linear transfer functions defined in equations (3) and (4), as shown in

NOTE In the log-log plots, all zero values, either on ordinate or abscissa, are disregarded.

Niveau d’entrée normalisé R Voie rouge

Niveau d’entrée normalisé V Voie verte

Niveau d’entrée normalisé B Voie bleue

Figure 5 – Points mesurés et courbes non linéaires estimées sur des échelles linéaires et bilogarithmiques

Normalised input level R Red channel

Normalised input level G Green channel

Normalised input level B Blue channel

Figure 5 – Measured points and estimated non-linear curves on linear and log-log scales

Relation inter-voie entre les données d'entrée et les composantes trichromatiques, X′,Y′,Z′, des couleurs affichées.

La relation dépendant de l'interaction des voies doit être définie comme suit:

In Article 9, the variables R′, V′, and B′ are defined as dependent on the input data D R, D V, and D B, respectively The dependent variables X′, Y′, and Z′ represent the measured and normalized trichromatic components of the output light, as outlined in section 8.2 Equation (5) involves the matrices S and T, which are defined as 3 × 3 and 3 × 8 matrices, respectively.

NOTE La matrice S est la relation dominante obtenue et consignée en 8.3 et la matrice T définit les relations de voies croisées parmi les voies rouge, verte et bleue.

To ensure accurate measurements, the equipment setup must align with either Figure 1 or Figure 2 The color signal should be applied to create the color pattern centered on the cathode ray tube display during measurement Additionally, the input data for the background luminance must be set to D R = 0, D V = 0, and D B = 0.

The measurement method requires that centered color patterns be presented alongside input data according to measurement levels, as illustrated in Table 6 for 32 colors Additionally, the normalized trichromatic components $X_i', Y_i', Z_i'$ for $i = 1$ to $i = 32$ must be successively measured by the colorimeter for all color patterns displayed on the cathode ray tube.

Inter-channel relationship between input data and tristimulus values, X′, Y′, Z′, of displayed colours.

The relationship depending upon channel interaction shall be defined as follows:

S (5) where the variables R′, G′, B′ are defined in clause 9 as dependent on input data D R , D G ,

D B, respectively, and dependent variables X′, Y′, Z′ are measured and normalised tristimulus values of light output, as in 8.2 In equation (5), S and T are 3 × 3 and 3 × 8 matrices defined respectively as follows,

NOTE The matrix S is the dominant relation obtained and reported in 8.3, and the matrix T defines inter- channel relations among red, green and blue channels.

The equipment must be arranged according to the specifications in Figure 1 or Figure 2 The color signal should be applied to create a color patch at the center of the CRT display being measured For the background input data, set D R = 0, D G = 0, and D B = 0.

The color patches will be displayed according to the input data and measurement steps outlined in Table 6 for a total of 32 colors The normalized tristimulus values $X_i', Y_i', Z_i'$ for each color patch on the CRT display, where $i$ ranges from 1 to 32, will be measured sequentially using a colorimeter.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. c) Les données R i ′,V i ′,B i ′, correspondant aux i i i D D

D R , V , B du tableau 6, doivent être calculées pour i = 1 à i = 32 en substituant les paramètres consignés des caractéristiques de tonalités dans les équations (3) et (4) en 9.1.

Tableau 6 – Entrées numériques pour produire des motifs de couleurs pour la mesure de la dépendance inter-voie

Dans le tableau 6, les valeurs des données D k doivent être les suivantes:

0 k k pour pour ó N est le nombre de bits par voie.

The data R′ i, G′ i, and B′ i, which correspond to D R i, D G i, and D B i in Table 6, will be calculated for values of i ranging from 1 to 32 by substituting the reported tone characteristic parameters into the specified equations.

Table 6 – Digital inputs to generate colour patches for measurement of inter-channel dependency

In Table 6, the values of data D k shall be

N k for for where N is the number of bits for each channel.

10.4 Présentation des résultats a) Les valeurs de la matrice des coefficients T définies dans l'équation (5) doivent être calculées par l'équation suivante:

A D b) La matrice doit être consignée selon le modèle ci-dessous:

T c) Les données mesurées doivent aussi être consignées, comme le montre le tableau 7.

Short-term stability

Stabilité à moyen terme

Mid-term stability

Tiêu đề	Partie 3: Apparatus using cathode ray tubes
Trường học	Not specified
Chuyên ngành	Multimedia systems and equipment
Thể loại	Standards document
Năm xuất bản	2000
Thành phố	Not specified

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