Discrete cosine transform (DCT) basis function visibility: effects of viewing distance and contrast masking

Andrew B. Watson; Joshua A. Solomon; Albert J. Ahumada Jr.; Alan Gale

doi:10.1117/12.172661

1 May 1994 Discrete cosine transform (DCT) basis function visibility: effects of viewing distance and contrast masking

Andrew B. Watson, Joshua A. Solomon, Albert J. Ahumada Jr., Alan Gale

Proceedings Volume 2179, Human Vision, Visual Processing, and Digital Display V; (1994) https://doi.org/10.1117/12.172661
Event: IS&T/SPIE 1994 International Symposium on Electronic Imaging: Science and Technology, 1994, San Jose, CA, United States

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.

Citation Download Citation

Andrew B. Watson, Joshua A. Solomon, Albert J. Ahumada Jr., and Alan Gale "Discrete cosine transform (DCT) basis function visibility: effects of viewing distance and contrast masking", Proc. SPIE 2179, Human Vision, Visual Processing, and Digital Display V, (1 May 1994); https://doi.org/10.1117/12.172661

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