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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 72, Iss. 8 — Aug. 1, 1982
  • pp: 1001–1007

Visual-error criterion for color-image processing

William A. Pearlman  »View Author Affiliations

JOSA, Vol. 72, Issue 8, pp. 1001-1007 (1982)

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We extend a new visual-error criterion for achromatic images to color images. After the tristimulus planes are transformed to a luminance-compatible color space, the achromatic-error criterion is used for the luminance plane and the squared-error criterion is used for the two chromatic planes taken together. The optimal linear estimator for the resulting color-image-error criterion is compared against a purely squared-error criterion in the task of reconstructing color images degraded by varying amounts of additive noise. The images restored with the new error criterion appeared sharper and truer in fine detail. Except for the least and most noisy cases, in which no clear preference was found, viewers of the cathode-ray-tube display unanimously preferred these restorations over the comparatively fuzzy squared-error ones, despite a grainier appearance. These results are consistent with the previous ones found with the new visual-error criterion for achromatic images only. Through this extension to color images and the good results in restoring noisy images, we have found an error criterion that shows promise for applications in color-image processing.

© 1982 Optical Society of America

William A. Pearlman, "Visual-error criterion for color-image processing," J. Opt. Soc. Am. 72, 1001-1007 (1982)

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  1. W. A. Pearlman, "A visual system model and a new distortion measure in the context of image processing," J. Opt. Soc. Am. 68, 374–386 (1978).
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  9. As the complex coefficients of the DFT have the Hermitian symmetry Y˜(k) = Y˜*(N - k), only one coefficient in each Hermitian pair is nonredundant.
  10. Because of limitations imposed by cost, Figs. 2–9 are reproduced in black and white. The author will provide a full set of color photographs on request.

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