Reduction of display artifacts by random samplingThe application of random-sampling techniques to remove visible artifacts (such as flicker, moire patterns, and paradoxical motion) introduced in TV-type displays by discrete sequential scanning is discussed and demonstrated. Sequential-scanning artifacts are described; the window of visibility defined in spatiotemporal frequency space by Watson and Ahumada (1982 and 1983) and Watson et al. (1983) is explained; the basic principles of random sampling are reviewed and illustrated by the case of the human retina; and it is proposed that the sampling artifacts can be replaced by random noise, which can then be shifted to frequency-space regions outside the window of visibility. Vertical sequential, single-random-sequence, and continuously renewed random-sequence plotting displays generating 128 points at update rates up to 130 Hz are applied to images of stationary and moving lines, and best results are obtained with the single random sequence for the stationary lines and with the renewed random sequence for the moving lines.
Document ID
19850042140
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ahumada, A. J., Jr. (NASA Ames Research Center Moffett Field, CA, United States)
Nagel, D. C. (NASA Ames Research Center Moffett Field, CA, United States)
Watson, A. B. (NASA Ames Research Center Moffett Field, CA, United States)
Yellott, J. I., Jr. (California, University Irvine, CA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1983
Subject Category
Man/System Technology And Life Support
Meeting Information
Meeting: Applications of digital image processing VI