Research on Visual Perception of Complex and Dynamic Imagery

This report discusses three main research topics, each of which is interpreted in terms of a spatial frequency analysis model of the human visual system. Parameters which affect the perception of clusters of line elements in dynamic, computer-generated displays are investigated. Transitions between...

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Bibliographic Details
Main Author: Pantle,Allan J
Format: Report
Language:English
Subjects:
Bionics
CLUSTERING
COMPUTER GRAPHICS
CONTRAST
CORRELATION TECHNIQUES
DYNAMIC RESPONSE
FOURIER ANALYSIS
FREQUENCY RESPONSE
LINES(GEOMETRY)
MATHEMATICAL FILTERS
PATTERN RECOGNITION
PE62202F
PSYCHOPHYSICS
SPATIAL DISTRIBUTION
VISION
VISUAL PERCEPTION
WUAMRL72330518
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Summary:This report discusses three main research topics, each of which is interpreted in terms of a spatial frequency analysis model of the human visual system. Parameters which affect the perception of clusters of line elements in dynamic, computer-generated displays are investigated. Transitions between perception of the moving cluster as a group and perception of the motion of the individual elements of the cluster are studied as a function of display frame rate, subject dark adaptation, image contrast, spatial orientation and various positional perturbations of elements in the cluster. The effect of spatial frequency components on eye movement in real-life scenes was studied by correlating eye movement patterns obtained from photographic scenes which were spatially high-pass filtered, low-pass filtered or unfiltered. Results indicate that areas of scenes containing strong low spatial frequency components attract attention more than areas containing strong high spatial frequency components. Velocity coding in the human visual system was studied by means of moving sinusoidal gratings. Results with complex moving gratings indicate that velocity perception depends partially on the temporal variation of intensity at each point on the retina due to the moving pattern. A complex pattern containing a fundamental spatial frequency and higher harmonic components appears to be moving faster than a stimulus consisting of only the fundamental component and moving at the same velocity as the complex pattern.