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任意形状图象对象的变换编码方法是 MPEG- 4视频编码实现的核心技术之一 .该文对基于对象的小波变换在任意形状图象编码算法中的应用给予了详尽的论述 .基于对象的小波变换包含两个步骤 :一是针对任意形状对象进行外插 ,使其可以运用规范的小波变换 ;二是进行小波系数的编码选择 ,以消除外插所产生的冗余 .实验结果表明 :基于对象的小波变换与诸如 SADCT等方法具有相似的低复杂度 ,性能相当 ;并且 ,在低比特率的情况下 ,其编码效果要优于 SADCT
The transform coding method of arbitrary shape image object is one of the core technologies of MPEG-4 video coding.This paper elaborates the application of object-based wavelet transform in arbitrary shape image coding algorithm.The object-based wavelet The transformation consists of two steps: one is to extrapolate any shape object so that it can use the standard wavelet transform; the other is to select the wavelet coefficients to eliminate the redundancy caused by extrapolation.The experimental results show that: Has the same low complexity as SADCT and so on, and its performance is better than that of SADCT at low bit rate