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12 Cards in this Set
- Front
- Back
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Viewpoint Problem
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Objects are rarely seen from the same viewpoint
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Category Complexity Problem
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The Specific objects that define a category are often quite different.
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Possible Solutions to the viewpoint and complexity problems
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1. template matching
2. structural description 3. View based recognition |
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Template matching
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Store a separate template for each possible viewpoint of each object within a category. To recognize, find the template that best matches the input group of image features.
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Why is simple template matching not possible?
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There would need to be way too many templates stored. Example: The letter A. It can be written several different ways and would need a separate template for each.
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Structural Description
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Store a set of shape components and their geometrical relationships for each category of objects. To recognize, find the components that roughly describe the input group of image features, then find the category ob objects whose stored components best match these input components.
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"face inversion: effect demonstrates:
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that recognition of objects is dependent upon viewpoint
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View Based Recognition ( template interpolation)
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Store a modest number of templates for each object category. These templates correspond to typical viewpoints and typical examples of each object category. To recognize, interpolate between templates within each category that best matches the input group of features.
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How does template interpolation work?
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With two stored templates a very large number of other templates can be generated by weighted combination of the two stored faces.
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What is the main neural pathway for object recognition?
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ventral (temporal) pathway
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What part of the brain has been implicated as the place where object perception, including face perception, takes place.
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I(T) Inferotemporal cortex
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What area in the IT is identified in magnetic resonance imaging studies when identifying faces.
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Fusiform Face Area (FFA)
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