Context-based entropy coding of block transform coefficients for image compression

Chengjie Tu; Trac D. Tran

doi:10.1117/12.449796

7 December 2001 Context-based entropy coding of block transform coefficients for image compression

Chengjie Tu, Trac D. Tran

Proceedings Volume 4472, Applications of Digital Image Processing XXIV; (2001) https://doi.org/10.1117/12.449796
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

It has been well established that state-of-the-art wavelet image coders outperform block transform image coders in the rate-distortion (R-D) sense by a wide margin. Wavelet-based JPEG2000 is emerging as the new high-performance international standard for still image compression. An often asked question is: how much better are wavelets comparing to block transforms in image coding? A notable observation is that each block transform coefficient is highly correlated with its neighbors within the same block as well as its neighbors within the same subband. Current block transform coders such as JPEG suffer from poor context modeling and fail to take full advantage of inter-block correlation in both space and frequency sense. This paper presents a simple, fast and efficient adaptive block transform image coding algorithm based on a combination of pre-filtering, post-filtering, and high-order space-frequency context modeling of block transform coefficients. Despite the simplicity constraints, coding results show that the proposed codec achieves competitive R-D performance comparing to the best wavelet codecs.

Citation Download Citation

Chengjie Tu and Trac D. Tran "Context-based entropy coding of block transform coefficients for image compression", Proc. SPIE 4472, Applications of Digital Image Processing XXIV, (7 December 2001); https://doi.org/10.1117/12.449796

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