Experiments On Image Coding With Distortion Below Visual Threshold

E. Dubois; Y. Rahmouni; F. Lortie

doi:10.1117/12.976495

13 October 1987 Experiments On Image Coding With Distortion Below Visual Threshold

E. Dubois, Y. Rahmouni, F. Lortie

Proceedings Volume 0845, Visual Communications and Image Processing II; (1987) https://doi.org/10.1117/12.976495
Event: Cambridge Symposium on Optics in Medicine and Visual Image Processing, 1987, San Diego, CA, United States

Abstract

Two quantization methods for high quality image coding are presented. The goal in both methods is to keep subjective distortion below visual threshold. The first method is a discrete cosine transform coding system. The coefficients of the transformed blocks are quantized with a set. of uniform quantizers with step sizes determine by a parametric function. Subjective experiments were carried out to determine the parameter values which minimize output entropy while keeping distortion at about the threshold of perceptibility. The second method is a vector quantizer on small image blocks. A structured quantizer defined by a few parameters is described, and approximate parameter values for transparent, coding are given.

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E. Dubois, Y. Rahmouni, and F. Lortie "Experiments On Image Coding With Distortion Below Visual Threshold", Proc. SPIE 0845, Visual Communications and Image Processing II, (13 October 1987); https://doi.org/10.1117/12.976495

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