| 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. |
| 关键词: 小波 图像编码 比特分配策略 目标函数 λ迭代算法 |
| DOI： |
| 分类号: |
| 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) |
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| Improvement of λ-Iterate Bit Allocation Algorithm in Wavelet-Based Image Coding |
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CHEN Yi song,XIAO Rong,SUN Zheng xing,ZHANG Fu yan
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| 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. |
| Key words: wavelet image coding bit allocation strategy objective function λ iterate algorithm |
