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Proceedings Paper

Suppressing moire with lateral dispersion
Author(s): Bruce M Radl
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Paper Abstract

Color aliasing, in its most visible and objectionable form, colored moire, persists as a drawback to digital imaging of periodic objects, particularly fabrics. Sensors with mosaic color filters typically measure only 1/3 of the color information for each pixel. With an optical modification, a single subject point can be measured by laterally displaced red, green, and blue pixels. This is done by a shift of the color planes laterally using a dispersive optical element. The element creates an optical effect similar to chromatic aberration but uniform in magnitude and direction over the image. Light from a subject point passes through the optical system but is not focused to a point in the image plane. Instead the red component is focused to a different point than the green and blue components and all are arranged in a line. This element, or filter, causes one subject point to be measured by three sensor pixels, one red, one green and one blue. This in fact may result in an image having more useful information: fewer pixels of color-registered, error free data, rather than a larger number of pixels with color errors.

Paper Details

Date Published: 7 June 2004
PDF: 8 pages
Proc. SPIE 5301, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications V, (7 June 2004); doi: 10.1117/12.526778
Show Author Affiliations
Bruce M Radl, Mosaic Sciences, Inc. (United States)


Published in SPIE Proceedings Vol. 5301:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications V
Nitin Sampat; Morley M. Blouke; Ricardo J. Motta, Editor(s)

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