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Proceedings Paper

The Impact Of Boundaries On Color: Stabilized Image Studies
Author(s): James Larimer; Thomas Piantanida
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Paper Abstract

The NTSC standard for color television codes the chrominance signals at a lower spatial resolution than it codes the luminance signal. These differential resolutions result in a smearing of the colors in the scene relative to the edges that define objects, but television viewers are rarely aware of this degradation of the image because the human visual system also codes chrominance (i.e. hue) at a lower spatial resolution than it codes luminance (i.e. edges). Given the resolution difference for chrominance and luminance edges, a model of visual perception must explain why human observers do not perceive the color of objects flowing beyond the luminance edges of those objects. The internal chromatic aspects of objects, which may be determined at chrominance object-boundaries, may be constrained by the perceived spatial luminance boundaries of those objects. In the experiments that we will describe, a spatial chrominance and luminance boundary is prevented from moving on the viewer's retina by moving it image synchronously with eye movements. When the edge is stabilized on the retina, the appearance of the image depends upon the enclosing boundaries that are not stabilized on the retina. We have found that the appearance of the image, independently of the image's actual spatial energy distribution on the retina affects the ability of the human visual system to process information. For example, the viewer's flicker sensitivity depends upon the perceived color of the image and not its actual spectral energy distribution. The same is true for the perceived color of a small spot imaged on the stabilized fields.

Paper Details

Date Published: 24 June 1988
PDF: 7 pages
Proc. SPIE 0901, Image Processing, Analysis, Measurement, and Quality, (24 June 1988); doi: 10.1117/12.944726
Show Author Affiliations
James Larimer, NASA (United States)
Thomas Piantanida, SRI International (United States)

Published in SPIE Proceedings Vol. 0901:
Image Processing, Analysis, Measurement, and Quality
Gary W. Hughes; Patrick E. Mantey; Bernice E. Rogowitz, Editor(s)

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