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Form Perception

Form Perception. Midlevel Vision. Combine features into objects Early visual processing Interprets what we see Committee Laws of organization Visual illusions. Gestalt Laws. Form or configuration of a pattern Universal patterns we recognize as a group Sum is greater than the parts.

jillian-nicholson
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Form Perception

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  1. Form Perception

  2. Midlevel Vision • Combine features into objects • Early visual processing • Interprets what we see • Committee • Laws of organization • Visual illusions

  3. Gestalt Laws • Form or configuration of a pattern • Universal patterns we recognize as a group • Sum is greater than the parts

  4. Specific Laws • Web site: http://sites.sinauer.com/wolfe3e/chap4/startF.htm • Chapter 4

  5. Occlusion • Kaniza figure • Contours not really there • Visual system infers that square is occluding the circle

  6. Occlusion • Relatability • Edges relate across gaps

  7. Figure Ground • Segmentation • Surroundness • Size • Symmetry • Parallelism

  8. Global Superiority Effect • Our global perception can inhibit local perception

  9. Models of Object Recognition • Template model • Problem is that we need to many templates • Not enough neurons to handle this.

  10. Models of Object Recognition • Structural model • Assumes that common structures give rise to the perception of the object. • Should be independent of viewpoint

  11. Point of View

  12. Models of Object Recognition • Pandomonium model • Recognition by committee • Neural network that can learn

  13. Models of Object Recognition • Website: http://sites.sinauer.com/wolfe3e/chap4/startF.htm

  14. Face Recognition • Face inversion effect • http://www.michaelbach.de/ot/

  15. Face Recognition • Prosopagnosia: patient has difficulty identifying faces. • May know it is a face but not who it is. • Can recognize other objects.

  16. Object Recognition • What pathway • Temporal lobe • Agnosia

  17. Types of Agnosia • Poor perception of whole picture • Problems associated object with name • Can be in quite specific categories

  18. Types of agnosia • Color • Specific categories • Alexia

  19. Form Perception • Infants • Habituation • Form constancy • Figure ground

  20. Form Perception • Feature analysis • Comparison • Memory • Developmental characteristics

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