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一种新的基于先验数据表的JPEG-LS动态码率控制算法 被引量：4

A Novel Dynamic Rate Control Algorithm for JPEG-LS Based on Empirical Data Table
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摘要 JPEG-LS算法简单,压缩性能出众,特别适合应用在图像的无损/近无损压缩领域。但是,无法精确控制码率的缺点使得JPEG-LS难以应用在带宽受限的卫星图像编码领域。为了解决这个问题,该文基于对JPEG-LS编码特性的分析,通过理论推导得出输出码率与失真量化参数的数学关系,提出一种以查表算法为核心的新型JPEG-LS动态码率控制算法。相对于现有的动态码率控制算法,该算法具有码率精确度高,收敛速度快等优点。 JPEG-LS is suitable for the field of lossless/near-lossless image compression because of its simple algorithm and high performance. However, it is difficult for JPEG-LS to control precisely the bit rate, which makes it hard to be applied to bandwidth-constrained occasions such as the satellite image coding. To solve this issue, the mathematic relation between bit rate and the quantization parameter is obtained by analyzing the coding characteristics of JPEG-LS, with which a novel dynamic bit-rate control algorithm is proposed based on the look-up table algorithm. Experimental results show that the proposed new bit-rate control algorithm is superior to the current JPEG-LS rate control scheme on the accuracy of bit-rate and the speed of bit-rate convergence.
作者 张毅 雷杰 李云松
机构地区 西安电子科技大学综合业务网国家重点实验室
出处 《电子与信息学报》 EI CSCD 北大核心 2014年第4期823-827,共5页 Journal of Electronics & Information Technology
基金 国家优秀青年基金(61222101) 国家自然科学基金(61301287 61301291) 111基地项目(B08038) 中央高校基本科研业务费专项资金(K5051301043 K5051201043)资助课题
关键词 图像压缩 码率控制 近无损 JPEG—LS Image compression Bit-rate control Near-lossless JPEG-LS
分类号 TN919.81 [电子电信—通信与信息系统]
  • 相关文献

参考文献15

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二级参考文献13

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共引文献7

同被引文献36

  • 1李晓雯,陈新凯,李国林,王志华.低功耗全流水线JPEG-LS无损图像编码器的VLSI设计[J].清华大学学报（自然科学版）,2007,47(10):1654-1657. 被引量：6
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引证文献4

二级引证文献4

电子与信息学报
2014年 第4期

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