一种嵌入式小波四叉树帧间编码算法  

An Embedded Wavelet Quadtree Interframe Coding Algorithm

作　　者：王明辉[1] 彭立中[1] 

机构地区：[1]北京大学数学科学学院,北京100871

出　　处：《北京大学学报（自然科学版）》2002年第1期1-7,共7页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金 (6 9735 0 2 0;19872 0 0 6 );973项目 (G19990 75 10 5 )资助课题

摘　　要：提出了一种新的嵌入式小波四叉树帧间编码算法。算法对于运动补偿余量误差帧首先进行小波变换 ,并选取适当的阈值 ,用重要图表示大于该阈值的重要系数。根据残差帧小波系数的统计特性 ,用四叉树方法编码重要图 ,并对重要系数作位面编码 ,生成嵌入式码流。实验表明 ,与EZW ,ZTE等算法相比较 ,该算法编码效率高 ,复现图像质量好。Motion compensated prediction (MCP) error image has significant amplitudes mainly along the boundaries of moving objects,correspondingly its wavelet coefficients contain large energy in high frequency bands.This greatly reduces the coding efficiency of EZW.It is first provided that the correspondence between the significant amplitudes area of the MCP error image and the wavelet coefficient significant map,then encode the significant map efficiently using quadtree approach,followed by bit-plane coding the significant coefficients to produce an embedded data stream.Experiment result shows that compared to EZW and ZTE,the proposed algorithm is more efficient and has better performance.

关 键 词：小波视频编码 嵌入式编码 四叉树编码 视频压缩 运动补偿余量误差帧 残差帧 

分 类 号：TN919.81[电子电信—通信与信息系统]