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DOI:
Journal of Software:2001.12(5):645-649

基于小波变换的图像编码中λ迭代比特分配算法的改进
陈毅松,萧嵘,孙正兴,张福炎
(南京大学计算机科学与技术系,江苏南京 210093 南京大学计算机软件新技术国家重点实验室,江苏南京 210093)
Improvement of λ-Iterate Bit Allocation Algorithm in Wavelet-Based Image Coding
CHEN Yi song,XIAO Rong,SUN Zheng xing,ZHANG Fu yan
()
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Received:January 21, 2000    Revised:July 03, 2000
> 中文摘要: 基于小波图像编码的金字塔式小波分解后各子带系数的统计特性,提出一种改进的λ迭代比特分配算法,该算法使用λ序列的概念简化了传统λ迭代法的最优值求解过程.实验证明该改进算法在限定压缩比的小波图像编码中能够大大加快比特分配算法的收敛速度.
Abstract:This paper gives an improved algorithm of λ iterate bit allocation algorithm in wavelet based image coding, which is based on the statistical characteristic of sub band block after wavelet transform. The algorithm uses the concept of λ sequence to simplify the calculation in search for optimal value and significantly speeds up the convergence process of the algorithm.
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基金项目:Supported by the National Natural Science Foundation of China under Grant No.69903006 (国家自然科学基金) Supported by the National Natural Science Foundation of China under Grant No.69903006 (国家自然科学基金)
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陈毅松,萧嵘,孙正兴,张福炎.基于小波变换的图像编码中λ迭代比特分配算法的改进.软件学报,2001,12(5):645-649

CHEN Yi song,XIAO Rong,SUN Zheng xing,ZHANG Fu yan.Improvement of λ-Iterate Bit Allocation Algorithm in Wavelet-Based Image Coding.Journal of Software,2001,12(5):645-649