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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 11, Iss. 5 — Mar. 10, 2003
  • pp: 460–475

Automated computer evaluation and optimization of image compression of x-ray coronary angiograms for signal known exactly detection tasks

Miguel P. Eckstein, Jay L. Bartroff, Craig K. Abbey, James S. Whiting, and Francois O. Bochud  »View Author Affiliations

Optics Express, Vol. 11, Issue 5, pp. 460-475 (2003)

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We compared the ability of three model observers (nonprewhitening matched filter with an eye filter, Hotelling and channelized Hotelling) in predicting the effect of JPEG and wavelet-Crewcode image compression on human visual detection of a simulated lesion in single frame digital x-ray coronary angiograms. All three model observers predicted the JPEG superiority present in human performance, although the nonprewhitening matched filter with an eye filter (NPWE) and the channelized Hotelling models were better predictors than the Hotelling model. The commonly used root mean square error and related peak signal to noise ratio metrics incorrectly predicted a JPEG inferiority. A particular image discrimination/perceptual difference model correctly predicted a JPEG advantage at low compression ratios but incorrectly predicted a JPEG inferiority at high compression ratios. In the second part of the paper, the NPWE model was used to perform automated simulated annealing optimization of the quantization matrix of the JPEG algorithm at 25:1 compression ratio. A subsequent psychophysical study resulted in improved human detection performance for images compressed with the NPWE optimized quantization matrix over the JPEG default quantization matrix. Together, our results show how model observers can be successfully used to perform automated evaluation and optimization of diagnostic performance in clinically relevant visual tasks using real anatomic backgrounds.

© 2002 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(330.1880) Vision, color, and visual optics : Detection
(330.4060) Vision, color, and visual optics : Vision modeling

ToC Category:
Research Papers

Original Manuscript: December 18, 2002
Revised Manuscript: February 24, 2003
Published: March 10, 2003

Miguel Eckstein, Jay Bartroff, Craig Abbey, James Whiting, and Francois Bochud, "Automated computer evaluation and optimization of image compression of x-ray coronary angiograms for signal known exactly detection tasks," Opt. Express 11, 460-475 (2003)

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