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Proceedings Paper

Discrete cosine transform (DCT) basis function visibility: effects of viewing distance and contrast masking
Author(s): Andrew B. Watson; Joshua A. Solomon; Albert J. Ahumada; Alan Gale
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Paper Abstract

Several recent image compression standards rely upon the discrete cosine transform (DCT). Models of DCT basis function visibility can be used to design quantization matrices for arbitrary viewing conditions and images. Here we report new results on the effects of viewing distance and contrast masking on basis function visibility. We measured contrast detection thresholds for DCT basis functions at viewing distances yielding 16, 32, and 64 pixels/degree. Our detection model has been elaborated to incorporate the observed effects. We have also measured detection thresholds for individual basis functions when superimposed upon another basis function of the same or a different frequency. We find considerable masking between nearby DCT frequencies. A model for these masking effects also is presented.

Paper Details

Date Published: 1 May 1994
PDF: 10 pages
Proc. SPIE 2179, Human Vision, Visual Processing, and Digital Display V, (1 May 1994); doi: 10.1117/12.172661
Show Author Affiliations
Andrew B. Watson, NASA Ames Research Ctr. (United States)
Joshua A. Solomon, NASA Ames Research Ctr. (United States)
Albert J. Ahumada, NASA Ames Research Ctr. (United States)
Alan Gale, San Jose State Univ. (United States)


Published in SPIE Proceedings Vol. 2179:
Human Vision, Visual Processing, and Digital Display V
Bernice E. Rogowitz; Jan P. Allebach, Editor(s)

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