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Proceedings Paper

A HVS-Weighted Cosine Transform Coding Scheme With Adaptive Quantization
Author(s): King N. Ngan; Kin S. Leong; Harcharan Singh
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Paper Abstract

An adaptive cosine transform coding scheme capable of real-time operation is described. It employs an adaptive quantization scheme where the quantizer range is dynamically scaled by a fedback parameter from the rate buffer. To take into account the human visual characteristics, human visual system (HVS) properties are incorporated into the coding scheme. Results showed that the subjective quality of the processed images is significantly improved even at a low bit rate of 0.15 bit per pixel (bpp). Two images were coded with the adaptive scheme achieving an average of 0.2 bpp with very little perceivable degragation.

Paper Details

Date Published: 25 October 1988
PDF: 7 pages
Proc. SPIE 1001, Visual Communications and Image Processing '88: Third in a Series, (25 October 1988); doi: 10.1117/12.969016
Show Author Affiliations
King N. Ngan, National University of Singapore (Singapore)
Kin S. Leong, National University of Singapore (Singapore)
Harcharan Singh, National University of Singapore (Singapore)


Published in SPIE Proceedings Vol. 1001:
Visual Communications and Image Processing '88: Third in a Series
T. Russell Hsing, Editor(s)

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