PS_Form_Object_2 - Five Difficult Problems for Vision...

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1 Five Difficult Problems for Vision Systems Illumination problem The illumination of scenes is highly variable and complex. Depth problem The images in the eyes are two-dimensional projections of the three- dimensional environment. Context problem Objects often appear in a complex and varying context of other objects. Viewpoint problem Objects are rarely seen from the same viewpoint. Category complexity problem The specific objects that define a category are often quite different. Fundamental Biological Constraints Limited neural resources, dynamic ranges, and physical space Most natural tasks involve dealing with one or more of these difficult general problems. Furthermore, the solutions that the visual system can come up with in natural tasks are constrained by various fundamental biological factors.
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2 A room full of chairs. This figure illustrates the viewpoint and category complexity problems (as well as the context problem). There are examples of the same chair seen from many different viewpoints. There are also different shaped objects that are chairs.
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3 Possible solutions to the viewpoint and complexity problems Template matching 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. Structural description 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 of objects whose stored components best match these input components. View based recognition (template interpolation)
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This note was uploaded on 08/12/2008 for the course PSY 323P taught by Professor Geisler during the Spring '08 term at University of Texas at Austin.

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PS_Form_Object_2 - Five Difficult Problems for Vision...

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