Remodeling JPEG arithmetic coder for improved end-of-block marker coding

Gopal Lakhani

doi:10.1117/1.1787836

1 October 2004 Remodeling JPEG arithmetic coder for improved end-of-block marker coding

Gopal Lakhani

Author Affiliations +

Optical Engineering, Vol. 43, Issue 10, (October 2004). https://doi.org/10.1117/1.1787836

Abstract

In JPEG image compression algorithms, an entropy coder encodes an end-of-block (EOB) marker for each discrete cosine transform (DCT) block. The well-known Huffman coder encodes one such marker for each block. However, the binary arithmetic coder, which provides greater compression but is not as well known, encodes several EOB tests, one after each nonzero ac coefficient of the block. We present a modification to the JPEG arithmetic coding algorithm to reduce the number of EOB tests. Our algorithm encodes two extra zero ac coefficients for a small percentage of blocks, but it encodes fewer EOB tests. As a result, we reduce the total image code size by about 1.4% on average. In this process, we also study the effectiveness of the DCT and statistical models of this coder.

©(2004) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Gopal Lakhani "Remodeling JPEG arithmetic coder for improved end-of-block marker coding," Optical Engineering 43(10), (1 October 2004). https://doi.org/10.1117/1.1787836

Published: 1 October 2004

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