17-visual-patterns

17-visual-patterns - Psychology 3040/6014 Spring, 2008...

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Psychology 3040/6014 Spring, 2008 VISUAL FORM AND PATTERN RECOGNITION We have focused on the detection of features (points of light, edges, lines, colors) Now consider some slightly more sophisticated shapes What aspects of the visual system allow us to extract shapes? The key to recognizing objects is to see the foreground from the background, and a big clue is contrast differences 1. Contours via contrast a) Areas of center-surround fields i. Enhance contrast b) Lateral inhibition i. Fields beside one another inhibit each other ii. Sharpens the differences between them (increases contrast) iii. Mach bands 1. Example of edges being sharpened iv. Hermann grid 1. 2D set of edges 2. competition of large peripheral black fields and smaller, central white fields v. Lightness contrast 1. inhibition across an area causes a region’s lightness to be perceived as different 1 of 4
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Psychology 3040/6014 Spring, 2008 2. Stimulus change a) Movement of the image is important for edge detection
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This note was uploaded on 04/07/2008 for the course PSYC 3040 taught by Professor Walker during the Spring '08 term at Georgia Tech.

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17-visual-patterns - Psychology 3040/6014 Spring, 2008...

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