120ALecture3handout

120ALecture3handout - ObjectRecognition...

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Object Recognition The problem: Perceptual constancies Template matching Template plus transformations empirical evidence Structural descriptions empirical evidence
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Visual Recognition The visual recognition processes need to be general enough so as to allow us to recognize objects under variable conditions —achieve object constancy Yet specific enough to allow us to detect differences between objects, and exemplars of objects
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Example
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Object Constancy We can recognize objects across changes in: Illumination Size Occlusion Viewing position These changes create very different signals at the retina; the brain must be able to determine the constancy despite these differences
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Change in ViewPoint
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Occlusion
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Recognize in spite of difference in retinal stimulation
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The Challenge of Object Perception The stimulus on the receptors is ambiguous Inverse projection problem : an image on the retina can be caused by an infinite number of objects Objects can be hidden or blurred Occlusions are common in the environment
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Objects look different from different viewpoints Viewpoint invariance : the ability to
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This note was uploaded on 04/21/2009 for the course PSYCH 120A taught by Professor Harley during the Spring '07 term at UCLA.

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120ALecture3handout - ObjectRecognition...

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