视频帧组与其残差帧组交替的3D-DWT-SPIHT压缩编码方法研究

RESEARCH ON A NOVEL 3D-DWT-SPIHT CODING BY ALTERNATE GROUPS OF ORIGINAL AND RESIDUAL ERROR FRAME

提出一种改进的方法 ,它采用视频帧组与残差帧组交替来进行三维小波变换 ,减少视频帧组内的帧数、时间延迟和存储空间 ,同时在时间轴上采用两种小波基相结合的方法 ,提高了压缩效率和解码图像的质量 ;尤其是对背景复杂的视频序列有较好的效果 .实验结果表明本文方法在相同条件下比现有方法的PSNR平均提高约 1dB 。

An improved method that uses 3D-DWT-SPIHT in original video group and residual error group alternatively was proposed. In addition, the multi-wavelet bases were combined in time domain. The proposed method reduces coding latency time and releases memory requirement, and improves both compression efficiency and reconstructive image's quality, especially to the video sequences with complicated background. Simulation results show that, in the case of equal compression ratio and memory space, our method has higher quality( PSNR above 1dB) than available methods. It is still slightly better than others', when memory is reduced to half.