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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 18, Iss. 10 — Oct. 1, 2001
  • pp: 2385–2397

Suprathreshold wavelet coefficient quantization in complex stimuli: psychophysical evaluation and analysis

Marcia G. Ramos and Sheila S. Hemami  »View Author Affiliations


JOSA A, Vol. 18, Issue 10, pp. 2385-2397 (2001)
http://dx.doi.org/10.1364/JOSAA.18.002385


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Abstract

A psychophysical experiment is described that quantifies human sensitivities to suprathreshold distortions caused by wavelet coefficient quantization in natural images, and the resulting analysis is explained. The quantizer step sizes that cause the first three visible degradations relative to the original image are well predicted by exponential functions of subband standard deviation. The resulting root-mean-square (RMS) error in the image is constant for a spatial frequency and is independent of orientation. Contrast sensitivity calculations suggest a higher sensitivity to bands with higher energy, and threshold elevations for the second and third visible degradations are predicted well by the constant-RMS model. A quantization strategy based on the results is proposed for low-bit-rate applications.

© 2001 Optical Society of America

OCIS Codes
(100.7410) Image processing : Wavelets
(330.5020) Vision, color, and visual optics : Perception psychology
(330.5510) Vision, color, and visual optics : Psychophysics

Citation
Marcia G. Ramos and Sheila S. Hemami, "Suprathreshold wavelet coefficient quantization in complex stimuli: psychophysical evaluation and analysis," J. Opt. Soc. Am. A 18, 2385-2397 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-10-2385


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