论文部分内容阅读
本文研究了三维子波变换和分级三维零树混合视频编码算法，对图像序列体作３层２２子带时空分解后，再对最低频子带进行４子带空间分解．对这个特殊分解的三维子波结构，推广了零树的概念．用ＨＶＳ量化模型对子波系数施加量化，用分级三维零树表示量化后的２５带子波系数，这一方案比单级零树方法节省约６％的码率，并且实现了空间和时间可尺度化码流结构．
In this paper, three-dimensional wavelet transform and hierarchical three-dimensional zerotree mixed video coding algorithm are studied. After decomposing the image sequence body into three layers and twenty-two subbands, the lowest subband is decomposed into four subbands. The concept of zero tree is generalized for this special decomposition of three-dimensional wavelet structure. Quantization of wavelet coefficient by HVS quantization model and quantized 25-band wavelet coefficients by hierarchical three-dimensional zerotree scheme can save about 6% bit rate compared with single-stage zero-tree method, and achieve spatial and temporal scalability Stream structure.