opening a digital image

... data (interpretation by a machine/non-human, storage, transmission) 3 Trang 4Image Acquisition Discretization/Digitization Quantization Compression Image enhancement and restoration Image ... Trang 1  Prof Duong Anh Duc Trang 2 What is an image? o Picture, Photograph o Visual data o Usually two- or three-dimensional  What is a digital image? o An image which is “discretized,” ... X-ray imaging is used in a number of areas like medical diagnostics, astronomy, and industrial applications  X-rays generated by a X-ray tube (vacuum tube) pass through the object to be imaged

Ngày tải lên: 26/01/2015, 10:08

... digital information database creation and management with a focus on advanced network and information technologies The production and management of digital images and the management of digital ... Import data records or create records for the images and link to digital images d Build and maintain digital image database and design and maintain Web access for the collection 3 To produce a model ... collection of the African American Museum a Select, install, support and maintain a digital imaging laboratory The lab contains workstations with slide and photograph scanners as well as a video-conference

Ngày tải lên: 24/10/2022, 01:32

... help of a strain gauge, including axial strain, lateral strain, shear strain, principal strain, axial displacement and horizontal displacement Digital image correlation technique captures and records ... metal material in 2014 Ghorbani R, Matta F, Sutton M A, et al [7] analyzed and summarized the fracture failure mode and failure mechanism of bamboo wood as well as quantitatively measured the fracture ... with the actual material crack activity Qian X, Zhang S, Swaddiwudhipong S, et al [6] studied the stable crack expansion resistance automatic measurement technology based on the digital image method

Ngày tải lên: 04/12/2022, 15:13

... function argument, gamma defaults to 1 (linear mapping) ■ Figure 3.3(a) is a digital mammogram image, f, showing a small lesion, and Fig 3.3(b) is the negative image, obtained using the command >> ... [min(f(:)) max(f(:))] 3.2.2 Logarithmic and Contrast-Stretching Transformations Logarithmic and contrast-stretching transformations are basic tools for dynamic range manipulation Logarithm transformations ... the image plane itself, and methods in this category are based on direct manipulation of pixels in an image In this chapter we focus attention on two important categories of spatial domain processing:

Ngày tải lên: 28/04/2014, 10:26

... ;sannaad °e e® TU Anh II | ee lIIII - II saaaaaaa aaanaaaaa ab FIGURE 4.12 (a) Original image (b)-(f) Results of ideal lowpass filtering with cutoff c d_ frequencies set at radii values ... asaannaadad IIllllV @e ®® IIIlllll — II aaaaaaaa saaanagaada FIGURE 4.18 (a) Original image (b)-(f) Results of filtering with Gaussian lowpass a b filters with cutoff frequencies set at radii ... aaanadaad EEE eee ee0e IIlllll - IIl azaaaaad' aaaaaaad ab FIGURE 4.15 (a) Original image (b)-(f) Results of filtering with BLPFs of order 2, cd with cutoff frequencies at radii

Ngày tải lên: 08/05/2014, 15:46

... humans, who, after all, are the developers and users of these algorithms We can summarize by saying that RGB is ideal for image color generation (as in image capture by a color camera or image ... color-carrying information (hue and saturation) in a color image As a result, the HSI model is an ideal tool for developing image processing algorithms based on color descriptions that are natural and ... the gray scale is based on physical char- acteristics of the image For instance, Fig 6.21(a) shows an X-ray image of a weld ab FIGURE 6.20 (a) Monochrome image of the Picker Thyroid Phantom

Ngày tải lên: 08/05/2014, 15:59

... Trang 1Digital Image Processing, 2nd ed. www.imageprocessingbook.com© 2002 R C Gonzalez & R E Woods Chapter 7Wavelets and Multiresolution Processing Chapter 7Wavelets and Multiresolution ... Processing Trang 2Digital Image Processing, 2nd ed. www.imageprocessingbook.com© 2002 R C Gonzalez & R E Woods Chapter 7Wavelets and Multiresolution Processing Chapter 7Wavelets and Multiresolution ... Processing Trang 3Digital Image Processing, 2nd ed. www.imageprocessingbook.com© 2002 R C Gonzalez & R E Woods Chapter 7Wavelets and Multiresolution Processing Chapter 7Wavelets and Multiresolution

Ngày tải lên: 08/05/2014, 15:59

... restate that which is already known It is thus said to contain data redundancy Data redundancy is a central issue in digital image compression It is not an abstract concept but a mathematically ... several ways to reduce the amount of data used to represent an image The question that naturally arises is: How few data actual- ly are needed to represent an image? That is, is there a minimum amount ... two coded images might result in a marginal rating for the image in Fig 8.4(b) and a passable rating for that in Fig 8.4(c) a \ 1 Excellent An image of extremely high quality, as good as you

Ngày tải lên: 08/05/2014, 16:10

... part by four again Trang 35 All the subimages that did not contain a boundary between object and back- ground had variances of less than 75 All subimages containing boundaries had variances in excess ... category, the approach is to partition an image based on abrupt changes in intensity, such as edges in an image The principal approaches in the second category are based on partitioning an image into ... the Laplacian of a Gaussian sometimes is called the Mexican hat function Because the second derivative is a linear operation, convolving an image with VA is the same as convolving the image with

Ngày tải lên: 08/05/2014, 16:29

... description ababab Trang 512.1 @ Patterns and Pattern Classes 697 FIGURE 12.4 Satellite image of a heavily built downtown area (Washington, D.C.) and surrounding residential areas (Courtesy of NASA.) ... head that is narrower but taller than the characters As the head moves across a character, it produces a 1-D electrical signal (a signature) that is conditioned to be proportional to the rate of ... particular case, the problem was to classify areas such as vegetation, water, and bare soil Figure 12.13(b) shows the results of machine classification, using a Gaussian Bayes classifier The arrows

Ngày tải lên: 08/05/2014, 16:48

... computational advantage is The plot ofA as a function of n is a simple linear function starting at A = 1 for n = 2 Problem 3.18 One of the easiest ways to look at repeated applications of a spatial®lter ... be activated, its area has to be excited in its entirety,then, it can be seen from Fig P2.20(a) that to guarantee that a2£ 2 array of suchreceptors will be activated, a circular area of diameter ... described above, we add the following material to form a teaching outline for a one semester graduatecourse that has that undergraduate material as prerequisite Given that students have theappropriate

Ngày tải lên: 05/06/2014, 11:40

... for digital image acquisition, be it their cell phonecamera, digital camera, or scanner, has resulted in a plethora of digital imagesand, consequently, for many, digital image processing has become ... bitmaps, PGM (portable graymap) for grayscale images, and PNM (portable any map) for color images PGM images can be opened using ImageJ. 1.3.8 Additional File Formats For most practical applications, ... we almost always consider image data as being already inthe form of a two-dimensional array—ready to be accessed by a program—, in practice image data must first be loaded into memory from a file

Ngày tải lên: 05/06/2014, 11:55

... e image All t h e algorithms process a row of t h e image at a time Modifications to process a rectangular window subimage at a t i m e are straightforward All t h e algorithms assign new labels ... Morgenthaler and Rosenfeld) under which a set of voxels might be regarded as an adequate representation of a mathematically defined surface, such as a plane specified by an equation Assuming that ... operarepresent-tor and t h e region adjacency graph algorithm are useful Blob detection and recognition are also i m p o r t a n t in military applications such as target detection and aerial image

Ngày tải lên: 05/06/2014, 11:59

... displays 2 When the drum is rotated slowly, the images appear (as they are) adisjoint sequence of still images As the speed of rotation increasesand the images are displayed at a higher rate, a ... that affordable high-definition displays are widely available.High definition program material, although produced at a growing rate, hasnot kept pace Furthermore, archival video may be available ... different pass-bands Theirtarget applications are satellite imagery and computer graphics Hansen [3] and collaborators at the David Sarnoff Laboratory havedeveloped techniques for generating mosaics

Ngày tải lên: 05/06/2014, 12:06

... considerable image compression ratios and image quality even at low bit rates 1 Introduction Raw or uncompressed multimedia data such as graphics, still images, audio, and video requires substantial ... standard method in the image compression applications In the wavelet compression, the image data is transformed and compressed as a single data object rather than block by block as in a DCT-based ... neural network-based PCA approaches [35] It well known that the PCA is a data-dependent trans-form In other words, as the transform matrix is built based on the covariance matrix for a particular

Ngày tải lên: 21/06/2014, 05:20

... the remaining subimages are derived Then, the subimage with the smallest Manhattan distance is cho-sen for the second subimage If these Manhattan distances are same, the subimage with the largest ... subimages instead of four subimages To derive an LMV, the second derivatives of an original image are derived because it can represent edge information while ignoring flat areas As a result, a ... largest weights are compared Then, the subimage with the smaller Manhattan distance is chosen If these two Manhattan distances are the same, any subimage is selected For example, assume that LMV[0]

Ngày tải lên: 22/06/2014, 00:20

... ro-tated pose and under an arbitrary illumination condition, we manually establish the image correspondence between the test image and a mean face image at the frontal pose The frontal view image is ... build-ing a set of harmonic basis images for each pose Rather, we can analytically synthesize many sets of basis images from just one set of basis images, say, the frontal basis images For the ... uncon-trollable test image We take the advantage that the facial fea-tures on the frontal view mean face are available, and show how to estimate the head pose without knowing f All nota-tions

Ngày tải lên: 22/06/2014, 19:20

... distributes a secret image into m =6 shares and each participant holds one share Later, if r = 4 shares are received, the secret image can be revealed If less than 4 shares are received, then no information ... histogram is to a uniform dis-tribution The same four test images were used in the experi-mental evaluation The average value of the ratio of standard deviation to mean form shadow image histograms ... wavelet subbands such that small shadows for real-time progressive transmission are obtained Experimental results demonstrate that the proposed method yields small shadow images and has the capabilities

Ngày tải lên: 22/06/2014, 20:20

... simulations and comparative studies were carried out for still image compression including benchmark images (Lena and Barbara), synthetic aperture radar (SAR) images, and color images We have achieved ... NASA’s SAR image Spaceborne imaging radar-C/X-band synthetic aperture radar (SIR-C/X-SAR) is a joint US-German-Italian Project that uses a highly sophisticated imaging radar to capture im-ages ... summarizes our results The still image compression results include benchmark images (Lena and Barbara), SAR im-ages, and color images Since degradation in high compres-sion ratio images is unavoidable,

Ngày tải lên: 22/06/2014, 22:20

... gaseous, a mixture of gases, an article charged with a gas, or an aerosol. Some large photo processing and digital imaging facilities may have compressed gasses. Class 2.1 Flammable gas (e.g., propane) (The ... propane) (The label and placard have a red background.) Class 2.2 Non-flammable gas and non-toxic gas (e.g., compressed air) (The label and placard have a green background. Class 2.3 Toxic gas (e.g., sulphur ... grenades) Class 1.3 Fire hazard along with either a minor blast hazard or a minor projection hazard or both (e.g., fireworks, flares) Class 2 - Gases Class 2 Gases are substances that are gaseous,...

Ngày tải lên: 23/03/2014, 08:21