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Journal of Electronic Imaging

Experimental evaluation of psychophysical distortion metrics for JPEG-encoded images
Author(s): Daniel R. Fuhrmann; John A. Baro; Jerome R. Cox
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Paper Abstract

Two experiments for evaluating psychophysical distortion metrics in Joint Photographic Experts Group (JPEG) encoded images are described. The first is a threshold experiment, in which subjects determined the bit rate or level of distortion at which distortion was just noticeable. The second is a suprathreshold experiment in which subjects ranked image blocks according to perceived distortion. The results of these experiments were used to determine the predictive value of a number of computed image distortion metrics. It was found that mean-square-error is not a good predictor of distortion thresholds or suprathreshold perceived distortion. Some simple pointwise measures were in good agreement with psycho-physical data; other more computationally intensive metrics involving spatial properties of the human visual system gave mixed results. It was determined that mean intensity, which is not accounted for in the JPEG algorithm, plays a significant role in perceived distortion.

Paper Details

Date Published: 1 October 1995
PDF: 10 pages
J. Electron. Imag. 4(4) doi: 10.1117/12.220346
Published in: Journal of Electronic Imaging Volume 4, Issue 4
Show Author Affiliations
Daniel R. Fuhrmann, Washington Univ. (United States)
John A. Baro, Wheeling Jesuit College (United States)
Jerome R. Cox, Washington Univ. (United States)

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