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Proceedings Paper

DCTune perceptual optimization of compressed dental x-rays
Author(s): Andrew B. Watson; Mathias Taylor; Robert Borthwick
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Paper Abstract

This is a brief report on research on the subject of DCTune optimization of JPEG compression of dental x-rays. DCTune is a technology for optimizing DCT quantization matrices to yield maximum perceptual quality for a given bit-rate, or minimum bit-rate for a given perceptual quality. In addition, the technology provides a means of setting the perceptual quality of compressed imagery in a systematic way. We optimized matrices for a total of 20 images at two resolutions (150 and 300 dpi) and four bit-rates (0.25, 0.5, 0.75, 1.0 bits/pixel), and examined structural regularities in the resulting matrices. We also conducted some brief psychophysical studies to validate the DCTune quality metric and to demonstrate the visual advantage of DCTune compression over standard JPEG. Keywords: jpeg, compression, quantization, adaptive, image quality

Paper Details

Date Published: 7 May 1997
PDF: 14 pages
Proc. SPIE 3031, Medical Imaging 1997: Image Display, (7 May 1997); doi: 10.1117/12.273914
Show Author Affiliations
Andrew B. Watson, NASA Ames Research Ctr. (United States)
Mathias Taylor, Foothill College (United States)
Robert Borthwick, Foothill College (United States)

Published in SPIE Proceedings Vol. 3031:
Medical Imaging 1997: Image Display
Yongmin Kim, Editor(s)

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