lecture3_perceiving

lecture3_perceiving - Perceiving Objects and Recognizing...

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Perceiving Objects and Recognizing Patterns
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The Illusion of Clarity
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Outline Bottom-Up Processes Top-Down Processes Other Views of Perception Unusual Perception
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Bottom-Up Processing Also goes by “data-driven” or “stimulus driven” At the extreme, the stimulus completely determines final percept The system works in one direction – from stimulus to output Often this involves building percepts from small perceptual units (e.g., features)
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Bottom-Up Processing Three general classes Template matching Feature analysis Prototype matching
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Bottom-Up Processes Correspondence between (external) stimulus and stored pattern in memory (internal template) A pattern is compared to all templates and identified by the template that best matches it Works well in certain machine vision applications (e.g., cheques, product codes) Template Matching
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Bottom-Up Processes Need lots of templates Does not explain how we recognize new objects (create new templates?) Does not deal well with surface variation of stimuli Template Matching: Problems
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This note was uploaded on 03/19/2010 for the course PSYCH 207 taught by Professor Lodson during the Spring '05 term at Waterloo.

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lecture3_perceiving - Perceiving Objects and Recognizing...

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