L15-Objects II

L15-Objects II - Sensory Processes & Perception PSY 343...

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PSY 343 Fall Session 2007 - Lecture 15 Perceiving Objects 2 Instructor:  Sean Green
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Constructing Objects We talked about separating an object from  the background (figure ground segregation) We talked about grouping parts of the visual  scene together using Gestalt heuristics How do we tie the information we have  about a figure (colors, edges, etc.) into a  single object?
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Problems to Overcome Changes in Light levels
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Problems to Overcome Changes in Light levels Changes in viewpoint Viewer-centered representation Object-centered representation
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Problems to Overcome Changes in Light levels Changes in viewpoint The inverse projection problem
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Problems to Overcome Occlusion
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Ways of Overcoming Problems Shape from shading
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Ways of Overcoming Problems Heuristics Occlusion heuristic Light from above heuristic = +
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Ways of Overcoming Problems Top Down Processing Which one is easier to pick out?
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Ways of Overcoming Problems Top Down Processing Which one is easier to pick out?
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Constructing Objects Marr’s computational approach to object  perception Three stages 1: Primal Sketch 2: 2½D Sketch 3: 3D Representation
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Constructing Objects Marr’s computational approach to object  perception Three stages 1: Primal Sketch Visual system identifies edges and features Takes into account shadows, changes in  illumination Takes into account natural constraints
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Constructing Objects Marr’s computational approach to object 
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L15-Objects II - Sensory Processes & Perception PSY 343...

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