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CV in a Nutshell (I) Yi Li inNutshell.htm.

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Presentation on theme: "CV in a Nutshell (I) Yi Li inNutshell.htm."— Presentation transcript:

1 CV in a Nutshell (I) Yi Li inNutshell.htm

2 Outline Introduction Image Formation Early vision Cognition in psychology Face recognition (I)

3 Paper discussion (1) Recognition by Components: – Segmentation: blocks, cylinders, wedges, cones – Curvature, collinearity, symmetry, parallel – Contour, surface, texture – Occlusion – Top-down or bottom-up? – Relation: pairwise?

4 Paper discussion (2) Face Recognition – extremely low-resolution images (Yang and Ma) – Occlusion (sparse) – Component vs hollistic – Context! – Facial expression (Cohn) – Illumination (Basri and Jacobs) – Specialized (Martinez)

5 Image Formation Geometry – image plane – projection Physics of light – Brightness / Illumination – Light source – Lambertian scattered such that the apparent brightness of the surface to an observer is the same regardless of the observer's angle of view (wiki) nikonweb.com

6 Lighting

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8 Early Vision Early year of computer vision – David Marr (Psychologist, MIT) – Azriel Rosenfeld (Mathematician, Maryland) – Takeo Kanade (Engineer, CMU) Visual path – How early? – Recognition? – Saliency / gist scienceblogs.com

9 Illusion Aperture problem ment2.html ment2.html

10 Skeletonization

11 Template Matching Find transformation to align two images cost function Example: Chamfer Matching Example 2: Hough transform Example 3: Probabilistic voting

12 Deformable Shape matching – Shape Context Snake – Active Contour, Active Appearance Articulated objects – Scissor – Human body

13 Face Recognition Linear subspaces – PCA and LDA – Eigenfaces vs Fisherfaces

14 Q/A Introduction Image Formation Early vision Cognition in psychology Face recognition (I)


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