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Performance Improvement of Binary MQ Arithmetic Coder

2진 MQ 산술부호기의 성능 개선

Ko, Hyung Hwa;Seo, Seok Yong
고형화;서석용

  • Received : 2015.11.19
  • Accepted : 2015.12.07
  • Published : 2015.12.30

Abstract

Binary MQ arithmetic coding is widely used recently as a basic entropy coder in multimedia coding system. MQ coder esteems high in compression efficiency to be used in JBIG2 and JPEG2000. The importance of arithmetic coding is increasing after it is adopted as an unique entropy coder in HEVC standard. In the binary MQ coder, arithmetic approximation without multiplication is used in the process of recursive subdivision of range interval. Because of the MPS/LPS exchange activity happened in MQ coder, output byte tends to increase. This paper proposes an enhanced binary MQ arithmetic coder to make use of a lookup table for AQe using quantization skill in order to reduce the deficiency. Experimental results show that about 4% improvement of compression in case of JBIG2 for bi-level image compression standard. And also, about 1% improvement of compression ratio is obtained in case of lossless JPEG2000 coding. For the lossy JPEG2000 coding, about 1% improvement of PSNR at the same compression ratio. Additionally, computational complexity is not increasing.

Keywords

Binary MQ arithmetic coder;Entropy coder;JBIG2;JPEG2000;Q coder

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Acknowledgement

Supported by : 광운대학교