A HVS-Weighted Cosine Transform Coding Scheme With Adaptive Quantization

King N. Ngan; Kin S. Leong; Harcharan Singh

doi:10.1117/12.969016

25 October 1988 A HVS-Weighted Cosine Transform Coding Scheme With Adaptive Quantization

King N. Ngan, Kin S. Leong, Harcharan Singh

Proceedings Volume 1001, Visual Communications and Image Processing '88: Third in a Series; (1988) https://doi.org/10.1117/12.969016
Event: Visual Communications and Image Processing III, 1988, Cambridge, MA, United States

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.

Citation Download Citation

King N. Ngan, Kin S. Leong, and Harcharan Singh "A HVS-Weighted Cosine Transform Coding Scheme With Adaptive Quantization", Proc. SPIE 1001, Visual Communications and Image Processing '88: Third in a Series, (25 October 1988); https://doi.org/10.1117/12.969016

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