基于三维子波变换和分级零树扫描的视频编码算法研究

A Video Coding Algorithm Based on 3D WaveletTransform and Hierarchical Zerotree Scan

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．

A 3D wavelet transform and hierarchical 3D zerotree hybrid video coding algorithm is investigated in this paper.After 22band pyramid spatialtemporal wavelet decomposition,4band spatial decomposition for the lowest frequency band is carried out.For this special 3D structure of wavelet decomposition,zerotree conception is extended.The wavelet coefficients are quantized using a HVS quantization model.The hierarchical 3D zerotree represents the quantized 25band wavelet coefficients.This scheme reduces about 6% bitrates compared with singlelevel zerotree and realizes the spatialtemporal scalability coding stream.