摘要
研究了基于小波变换的图象编码。在系统地分析了小波变换各子图象的量化噪声和恢复噪声的基础上，提出了在给定的比特率下，使系统恢复失真达到最小的优化比特分配方案。指出了在均匀量化时各子图象量化步长之间具有成倍的关系。模拟实验证明了该结论，并给出了满意的结果。
Astudy of Image Coding based on Wavelet Transform is made in this paper.On the basis of a systematic analysis of the quantization noises and the reconstruction noises of the sub images,an optimal bit allocation scheme is presented,which minimizes the system reconstruction distortion at a given bit rate.When uniform quantizers are used,it is shown that the quantization step of a succeeding level in the wavelet pyramid is a half of that of its predecessor level.The simulation experiments demonstrate the conclusion of this paper and give satisfactory results.
出处
《中国图象图形学报（A辑）》
CSCD
1997年第8期549-554,共6页
Journal of Image and Graphics
基金
国家自然科学基金
