摘要： 可分级视频编码适用于网络环境变化较大的视频传输领域，它为用户提供不同质量的视频。但是，在空间可分级编码器中，基本层图像的方块效应会影响增强层的预测，降低其编码效率。如果采用去方块滤波器对基本层的恢复图像进行滤波，可以期望减轻块效应带来的不良影响。该文针对分块DCT 压缩编码产生的方块效应，将小波域软阈值去方块滤波算法应用到空间可分级视频编码中，实验验证该方法能较好地改善图像质量，具有良好的效果。

关键词: 空间可分级视频编码；方块效应；小波软阈值去方块滤波算法

Abstract: The scalable video coder is desired in a multi-resolution environment, which can provide the users with video streams with various quality. But in a spatial scalable encoder, the blocking effect caused by the BDCT used in the base layer can disturb the prediction result in the enhancement layer, which will decrease the encoding efficiency. Thus if a daglocking filter is implemented to smooth the reconstructed image, the bad effect is removed. This paper applies an efficient wavelet-based soft-threshold deblocking algorithm to the spatial scalable video encoder for eliminating the blocking effect and performances a simulation. The result shows the significant efficiency.

Key words: Spatial scalable video encoder; Blocking effect; Wavelet-based soft-threshold deblocking algorithm