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Front-end computations in human vision

Front-end computations in human vision . Jitendra Malik U.C. Berkeley References: DeValois & DeValois,Hubel, Palmer, Spillman &Werner, Wandell. Cerebral Cortex. Monocular Visual Field: 160 deg (w) X 135 deg (h) Binocular Visual Field: 200 deg (w) X 135 deg (h). Cones and Rods.

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Front-end computations in human vision

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  1. Front-end computations in human vision Jitendra Malik U.C. Berkeley References: DeValois & DeValois,Hubel, Palmer, Spillman &Werner, Wandell

  2. Cerebral Cortex

  3. Monocular Visual Field: 160 deg (w) X 135 deg (h)Binocular Visual Field: 200 deg (w) X 135 deg (h)

  4. Cones and Rods

  5. ON and OFF cells in retinal ganglia

  6. Modeling simple cells • Elongated directional Gaussian derivatives • 2nd derivative and Hilbert transform • L1 normalized for scale invariance • 6 orientations, 3 scales • Zero mean

  7. Orientation Energy • Gaussian 2nd derivative and its Hilbert pair • Can detect combination of bar and edge features; also insensitive to linear shading [Perona&Malik 90] • Multiple scales

  8. Visual Processing Areas

  9. Macaque Visual Areas

  10. Textons (Malik et al, IJCV 2001) • K-means on vectors of filter responses

  11. Textons (cont.)

  12. Texton Histograms Chi square test: i 0.1 j k 0.8

  13. CSF as function of eccentricity

  14. Receptor density vs eccentricity

  15. Cortical Magnification Factor

  16. Mapping from Retina to V1

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