Digital Camera and Computer Vision Laboratory Department of Computer Science and Information Engineering National Taiwan University, Taipei, Taiwan, R.O.C.

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Digital Camera and Computer Vision Laboratory Department of Computer Science and Information Engineering National Taiwan University, Taipei, Taiwan, R.O.C. A Guided Tour of Computer Vision By: V. S. Nalwa Presented by: 傅楸善博士

DC & CV Lab. NTU CSIE

DC & CV Lab. NTU CSIE Can you see anything in this picture?

DC & CV Lab. NTU CSIE Introduction computer vision: image understanding: automatic deduction of structure and properties of 3D world from 2D world images computer graphics: visual synthesis: creates 2D images from 3D models photograph illustrating vanishing point

DC & CV Lab. NTU CSIE

DC & CV Lab. NTU CSIE Shape from Texture results of integrated approach to identification of image texels

DC & CV Lab. NTU CSIE

DC & CV Lab. NTU CSIE Shape from Texture (cont’) visual cliff of Siamese kitten peering over checkered cliff

DC & CV Lab. NTU CSIE Shape from Texture (cont’) shape of golf ball recovered from projective distortion of circular texels

DC & CV Lab. NTU CSIE Shape from Texture (cont’) image textural variation as cue to 3D shape

DC & CV Lab. NTU CSIE Shape from Texture (cont’) 3D implications of discontinuities (a) depth discontinuity (b) two surfaces

DC & CV Lab. NTU CSIE Shape from Texture (cont’) fractals: shapes exhibiting recursive self- similarity

DC & CV Lab. NTU CSIE Shape from Texture (cont’) Escher-inspired pattern with two texels (texture elements)

DC & CV Lab. NTU CSIE Shape from Texture (cont’) textures (a) water (b) beach pebbles (c) raffia weave (d) brick wall

DC & CV Lab. NTU CSIE Shape from Texture (cont’) texture segmentation

DC & CV Lab. NTU CSIE Shape from Texture (cont’) =====experiment: take pen cap off, put cap back with one eye=====

DC & CV Lab. NTU CSIE Shape from Stereo scene recovered from pair of stereo images

DC & CV Lab. NTU CSIE Shape from Stereo (cont’s) range image: the darker the nearer, the brighter the farther

DC & CV Lab. NTU CSIE Shape from Stereo (cont’s) stereo: recovery of 3D scene structure from images of different viewpoints

DC & CV Lab. NTU CSIE

DC & CV Lab. NTU CSIE Shape from Stereo (cont’s) implication of ambiguous correspondence between image points

DC & CV Lab. NTU CSIE

DC & CV Lab. NTU CSIE Shape from Stereo (cont’s) occlusion as impediment to stereo

DC & CV Lab. NTU CSIE Shape from Stereo (cont’s) Monotonic-ordering assumption: conjugate image points have same order violation of monotonic-ordering assumption

DC & CV Lab. NTU CSIE Shape from Shading shading: variation in brightness of surface photographs of model with and without makeup

DC & CV Lab. NTU CSIE Shape from Shading (cont’) shading as cue to surface shape

DC & CV Lab. NTU CSIE Shape from Shading (cont’) Characteristic-strip method of shape from shading

DC & CV Lab. NTU CSIE Shape from Shading (cont’) shape of boundary of shaded image region as factor in 3D interpretation

DC & CV Lab. NTU CSIE Shape from Shading (cont’)

DC & CV Lab. NTU CSIE Shape from Shading (cont’) reflectance map, illuminated in direction [0 0 ─1]