Active Visual Inference of Surface Shape - Roberto Cipolla Part 6 potx

... 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

... [ 163 ] [ ]64 ] [ 165 ] [ 166 ] [ 167 ] [ 168 ] R.S. Millman and G.D. Parker. Elements of Differential Geometry. Prentice-Hall, N J, 1977. H.P. Moravec. Visual mapping by a robot rover. In Proc. of ... Human-Computer Interaction. Proceedings, 1995. VIII, 203 pages. 1995. VOL. 10 16: R. Cipolla, Active Visual Inference of Surface Shape. XII, 194 pages. 1995. Vol....

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... shading 166 A.5.2 Interpreting line drawings 167 A.5.3 Shape from contour 168 A.5.4 Shape from texture 169 Curved surfaces 169 A .6. 1 Aspect graph and singularity theory 169 A .6. 2 Shape from ... 10 16) ISBN 3-5 4 0 -6 064 2-4 NE: GT CR Subject Classification (1991): 1.4, 1.2.9, 1.3.5, 1.5.4 Cover Illustration: Newton after William Blake by Sir Eduardo Paolozzi (1992)...

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... 3D shape of surfaces in the vicinity of their apparent contours. We describe the real-time implementations of these algorithms for use in tasks involving the active exploration of visible surface ... relate these first to the descriptions of local 3D shape developed from the differ- ential geometry of surfaces and then to the analysis of visual motion of apparent...

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... the shape of the rim, a convexity of the contour corresponds to a convex patch of surface, a concavity to a saddle-shaped patch. Inflections of the contour correspond to flexional curves of ... rs) -p.L(rs) = -p.n8 (2.20) 2.5. The dynamic analysis of apparent contours 29 Equation (2.31) is derived in section 2 .6. 4. An alternative proof of the rela- tionship between th...

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... 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] ... Sampling- Isolated texture only "samples" the surface at isolated points - the surface could have any shape in between the points. Conversely, a surfa...

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... image velocities can now be expressed in terms of the new parameterisation (see figure 4.12). qt- O-~s (4 .66 ) - -~ 8 ~-~ _ t+~ . (4 .67 ) Equation (4 .67 ) is simply resolving the (real) image velocity ... .~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...

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... 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 ... 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 surface...

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... 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 ... whereas the interpretation of the surface consistency theory is that the surface has at most one surface inflection in the absence of zero-crossings [32]. The im...

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... 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