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Visual Pattern Recognition

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Visual Pattern Recognition

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  1. Evidence and Consequences of Feature Detection in The Visual Pattern Recognition of Reading by Taylor J. Meek is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.These original publications may be accessed electronically from: http://www.lingnik.com/visual-pattern-recognition Visual Pattern Recognition Taylor J. Meek October 22, 2009

  2. Difference Detectors and Visual Aftereffects Finding the Feature Detectors Building Feature Detector Systems Physiological Visual System

  3. Difference Detectors + Input A + Base Level - A No Activity Difference Detector Basal Activity + B Input B Base Level - No Activity - No Activity

  4. Difference Detectors Red Red + Base Level Tired Red No Activity Difference Detector Neutral Color(Yellow) Green Green Green Base Level - No Activity Tired No Activity

  5. Difference Detectors Red Red + Base Level Tired Red No Activity Difference Detector Neutral Color(Yellow) Green Green Green Base Level - No Activity Tired No Activity

  6. Difference Detectors + MovementUp + Base Level - Up No Activity Difference Detector Basal Activity + Down Movement Down Base Level - No Activity - No Activity

  7. Aftereffects Complementary Color Photoreceptors Something More Abstract “The McCollough Effect”

  8. 1 (Gibson & Harris 1968 in Lindsay & Norman 1977)

  9. 2 (Gibson & Harris 1968 in Lindsay & Norman 1977)

  10. (Gibson & Harris 1968 in Lindsay & Norman 1977)

  11. Difference Detectors So what? Eye Transfer Color Desensitization Motion Detector Desensitization Orientation-specific Line Detectors

  12. Feature Detectors Edge Slit/Line Dimness ++- ++- ++- --+ --+ --+ +-+ +-+ +-+ -+- -+- -+- +++ +++ +++ --- --- ---

  13. Physiological Feature Detectors Convex Edge Moving Contrast (Edge) Edge Dimness http://flickr.com/photos/thomashawk/90125879/ Toad by Thomas Hawk, under CC License

  14. Feature Detectors in Higher-Order Species Light Ganglion & Bi-Polar Cells • On-Center, Off-Surround • Off-Center, On-Surround • Light Onset, Extinction • Peculiar Receptive Fields • Color Specificity, Contrast • Movement (Directional) Receptive Field Ganglion Cell (Lindsay & Norman 1977, p.215)

  15. Simple Feature Detector Cells in Higher-Order Species Slit and Line Edge +-+ +-+ +-+ -+- -+- -+- • Selective to: • Location • Type • Orientation/direction • Width ++- ++- ++- --+ --+ --+

  16. Complex Feature Detector Cells in Higher-Order Species Slit and Line Edge +-+ +-+ +-+ -+- -+- -+- • Selective to: • Location • Type • Orientation/direction • Width ++- ++- ++- --+ --+ --+

  17. Hyper-Complex Feature Detector Cells in Higher-Order Species Size/Endpoint Termination Movement (Axial Bidirectional) Angle

  18. Hyper-Complex Feature Detector Cells in Higher-Order Species Size/Endpoint Termination

  19. Hyper-Complex Feature Detector Cells in Higher-Order Species Size/Endpoint Termination

  20. Hyper-Complex Feature Detector Cells in Higher-Order Species Movement (Bidirectional)

  21. Hyper-Complex Feature Detector Cells in Higher-Order Species Angle

  22. Higher-Level Feature Detector Cells in Higher-Order Species

  23. Higher-Level Feature Detector Cells in Higher-Order Species http://flickr.com/photos/crowolf/205180735/ The Monkey Paw by John “Jay” Glenn, under CC License

  24. Higher-Level Feature Detector Cells in Higher-Order Species (Lindsay & Norman 1977, p.250)

  25. Building UpComplex Feature Detectors http://flickr.com/photos/residae/386508456/ Father of the Eye by Desirae, under CC license

  26. Features and Grouping Geon Theory Cognitive Feature Detection

  27. Features and Objects

  28. Physiological Nystagmus Jiggly Eye Movements http://en.wikipedia.org/wiki/Image:Optokinetic_nystagmus.gif Available under GNU Free Documentation License, http://commons.wikimedia.org/wiki/Commons:GNU_Free_Documentation_License

  29. (Verheijen 1961 in Lindsay & Norman 1977)

  30. Physiological Nystagmus Jiggly Eye Movements (Dodwell 1970, p.188)

  31. Physiological Nystagmus Jiggly Eye Movements (Lindsay & Norman 1977, p.40-44)

  32. Segmental Image Loss (From R.M. Pritchard, Scientific American, 1961 in Lindsay & Norman 1977)

  33. Object Segmentation into Features

  34. Feature Classes Biederman (1995)

  35. Feature Relation

  36. Geons Biederman (1995)

  37. Geons to Scenes Biederman (1995)

  38. Features Sensory Input Physiological Features SimpleComplexHypercomplexHigher-Level Feature Classes + Feature Relations Object Segments Objects

  39. Pandemonium Revisited Pattern Recognition

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