PS_Depth - Five Difficult Problems for Vision Systems...

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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
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2 Depth Perception A. Oculomotor cues 1. Accommodation 2. Convergence B. Visual cues 1. Static monocular a. Occlusion b. Elevation c. Perspective d. Shading and shadows e. Blur and visibility f. Familiarity 2. Binocular 3. Motion The brain uses many sources of information to determine distance and 3D shape.
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3 Oculomotor cues to depth. There are two hypotheses about how these circuits work: inflow hypothesis (A) and outflow hypothesis (B).
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4 Depth Perception A. Oculomotor cues 1. Accommodation 2. Convergence B. Visual cues 1. Static monocular a. Occlusion b. Elevation c. Perspective d. Shading and shadows e. Blur and visibility f. Familiarity 2. Binocular 3. Motion
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5 Occlusion cues. T intersections play an important role in depth perception from occlusion.
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6 Perspective (texture gradient) cues.
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7 More perspective cue examples.
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8 Shading cues to depth and shape
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PS_Depth - Five Difficult Problems for Vision Systems...

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