基于分块三维小波变换的视频图像序列编码方法的研究

该文给出了一种基于分块三维小波变换的视频图像序列编码方法。将视频图像序列中表示帧序的t坐标代换成z坐标后,可把一视频图像序列看成是三维空间中的体。将视频图像序列分成子块后,仿照二维图像小波变换的方法,将它作三维小波变换。变换后的图像能量主要集中于低频波段,这些波段对该视频图像序列的视觉效果影响最大。将不同波段按不同的精度量化并进行熵编码,可以达到去除帧内和帧间冗余、压缩数据的目的。试验表明,使用这种方法可以达到较好的压缩效果。此方法直观,速度也比较快。

AN ALGORITHM FOR VIDEO SIGNAL CODING BASED ON 3D-WAVELET TRANSFORMATION

This paper presents an algorithm for video signal coding based on 3D-wavelet transformation. When the frame order t of the video signal is replaced by order z, the video signal can be looked as a block in the 3D-space. After split the block into smaller sub-blocks, imitate the method of 2D-wavelet transformation for image, the sub-blocks can be transformed with 3D-wavelet. Most of the video signal energy is in the transformed low-frequency bands. These bands affected the visual quality of the video signal most. After quantizing different bands with different precision and entropy coding each band, the inter- and intra-frame redundancies of the video signal can be eliminated and the data can be compressed. The simulation experiments show that this algorithm can achieve very good result.