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Improvement of the coding efficiency for the QM-coder

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 2000年第1期83卷 1-9页

作者： Kuroki, Y Ohta, T Kyushu Inst Technol Fac Engn Kitakyushu Fukuoka 804 Japan

The QM-coder [1] is an arithmetic code that is used in common in JPEG and JBIG as the binary information source coding. The most remarkable feature of arithmetic code is that dynamic adaptation can easily be realized. In other words, the code has high versatility. The same algorithm is effective for information sources with various statistical properties, and the code is expected to be applied to various kinds of information source coding [1-3]. However, the QM-coder uses a subtraction-type arithmetic code in order to simplify processing, with the augend operation executed only by constant substitution and subtraction. Thus, it is anticipated that the coding efficiency will be degraded. From such a viewpoint, this paper presents a proposal for the improvement of coding efficiency for subtraction-type arithmetic code [11, 12]. The proposed technique is to separate the augend into several states, and the constant to be assigned to the less probable symbol is varied according to the state. The probability estimation table in the proposed method is constructed by a theoretical investigation based on the table used in the QM-coder. As a result of the coding simulation for the binary image, it is seen that the proposed method can reduce the coding complexity by 0.686% to 1.301% compared to the QM-coder. (C) 1999 Scripta Technica.

关键词： arithmetic coding QM-coder markov model coding

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Improvement of the coding efficiency for the QM-coder

引用

Electronics and Communications in Japan (Part I: Communications) 1999年第1期83卷

作者： Yoshimitsu Kuroki Teiji Ohta Faculty of Engineering Kyushu Institute of Technology Kitakyushu Japan 804

The QM-coder [1] is an arithmetic code that is used in common in JPEG and JBIG as the binary information source coding. The most remarkable feature of arithmetic code is that dynamic adaptation can easily be realized. In other words, the code has high versatility. The same algorithm is effective for information sources with various statistical properties, and the code is expected to be applied to various kinds of information source coding [1–3]. However, the QM-coder uses a subtraction-type arithmetic code in order to simplify processing, with the augend operation executed only by constant substitution and subtraction. Thus, it is anticipated that the coding efficiency will be degraded. From such a viewpoint, this paper presents a proposal for the improvement of coding efficiency for subtraction-type arithmetic code [11, 12]. The proposed technique is to separate the augend into several states, and the constant to be assigned to the less probable symbol is varied according to the state. The probability estimation table in the proposed method is constructed by a theoretical investigation based on the table used in the QM-coder. As a result of the coding simulation for the binary image, it is seen that the proposed method can reduce the coding complexity by 0.686% to 1.301% compared to the QM-coder. © 1999 Scripta Technica, Electron Comm Jpn Pt 1, 83(1): 1–9, 2000

关键词： arithmetic coding QM-coder markov model coding

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