Active Visual Inference of Surface Shape - Roberto Cipolla Part 9 doc

... .~P(4.70) qtt. ap = O-ts ~'~t'~v-t-2 ~ -~ -~ t .1. -~ Apart from (~ [~) which we have seen determines the magnitude of the tan- gential component of image curve velocity (and is not measurable) ... (deformation) components. v~, vy - 7 7- 1 0 + T 0 1 + 2 sin it cos It 0 - 1 - sin It cos It curl'7 [ 0 -1 ] div-7[ 1 0] def~7[cos2it sin2#] -...

Ngày tải lên: 10/08/2014, 01:22

... for a: N.n p (1 - (p.m)~) a p a -~ -( 1- (p.m)2). (4.37) Differentiating (4.20) and rearranging we can recover the other component, /3: at p -2 n ~ ( 1-( p.m)2)'/2] - -( p.m) 2) p U.p] ... the sign of the curvature of the projection de- pends on which side of the osculating plane the ray, p lies, i.e. the sign of the 2 The geodesic curvature of...

Ngày tải lên: 10/08/2014, 01:22

... geometry of the surface in the vicinity of ext~vmal boundary. The surface is recovered as a family of s-parameter curves - the contour generators - and t-parameter curves - portions of the osculating ... recovering surface shape 73 Figure 3.14: Recovery of surface strip in vicinity of extremM boundary. From a minimum of three views of a curved surfa...

Ngày tải lên: 10/08/2014, 01:22

... way. 9 The axis of expansion (#) of the deformation component and the projection in the image of the direction of translation (/A) allow the recovery of the tilt of the surface (5.28). 9 We ... Differential invariants of the image velocity field 127 The magnitude of the depth gradient determines the tangent of the slant of the surface (angle between the surf...

Ngày tải lên: 10/08/2014, 01:22

... interpretation of random-dot stereograms have shown that even with sparse data the human visual system arrives at unique interpretations of surface shape - the perception of dense and coherent surfaces ... solutions to the problem of recovering reliable descriptions of curved surface shape. These have been de- veloped from the analysis of visual motion and differ...

Ngày tải lên: 10/08/2014, 01:22

... velocities from the output of a set of spatio-temporal filters. A bank of 24 spatio-temporal Gabor filters runs continuously in each neighbour- hood of a time-varying image. Each of the filters is tuned ... contour of objects made of gen- eralised cylinders can be used to determine the sign of curvature of the surface. The disadvantages of these methods is that they ar...

Ngày tải lên: 10/08/2014, 01:22

... pages 79 2-7 98 , 198 3. [93 ] C.G. Harris. Determination of ego-motion from matched points. In 3rd Alvey Vision Conference, pages 18 9- 1 92 , 198 7. [94 ] C.G. Harris. Resolution of the bas-relief ... (Memo)), 199 1. R. Cipolla and M. Yamamoto. Stereoscopic tracking of bodies in motion. Image and Vision Computing, 8(1):8 5 -9 0, 199 0. R. Cipolla and A. Zisserman...

Ngày tải lên: 10/08/2014, 01:22