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Half-Tone Video Images Of Drifting Sinusoidal GratingsDigital technique for generation of slowly moving video image of sinusoidal grating avoids difficulty of transferring full image data from disk storage to image memory at conventional frame rates. Depends partly on trigonometric identity by which moving sinusoidal grating decomposed into two stationary patterns spatially and temporally modulated in quadrature. Makes motion appear smooth, even at speeds much less than one-tenth picture element per frame period. Applicable to digital video system in which image memory consists of at least 2 bits per picture element, and final brightness of picture element determined by contents of "lookup-table" memory programmed anew each frame period and indexed by coordinates of each picture element.
Document ID
19910000139
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Mulligan, Jeffrey B.
(NASA Ames Research Center, Moffett Field, CA.)
Stone, Leland S.
(NASA Ames Research Center, Moffett Field, CA.)
Date Acquired
August 14, 2013
Publication Date
April 1, 1991
Publication Information
Publication: NASA Tech Briefs
Volume: 15
Issue: 4
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
ARC-12414
Accession Number
91B10139
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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