一种彩色视频图像序列的三维小波变换编码方法
AN ALGORITRHM FOR CODING COLOR VIDEO SIGNAL USING 3D-WAVELET TRANSFORMATION
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摘要: 该文给出了一种基于三维小波变换的彩色视频图像序列的编码方法。先将彩色视频图像序列的RGB(红绿蓝)色彩表示转换成YCbCr(亮度色度色度)表示,再将表示帧序的t坐标代换成z坐标,可将其看成是三维空间中的体。将其分成子块后,仿照二维图像小波变换的方法,对每个亮度色度分量做三维小波变换。变换后的各亮度色度分量的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。将不同分量的各个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,使用本方法可以达到较好的压缩效果。此方法较直观,速度也比较快。
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关键词:
- 小波; 三维小波变换; 彩色视频图像编码
Abstract: This paper presents an algorithm for coding color video signal using 3D-wavelet transformation. When the 3 color channels of RGB of the video signal are converted to color channels of YCbCr, and the frame order t of the signal is replaced by order z, this signal can be considered as 3 blocks in a 3D-space. Each block presents a color channel. After splitting each 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 energy of each color channel is in the transformed low-frequency bands. These bands affect the visual quality of the video signal most. After quantizing different bands with different precision and entropy coding each band, the intra- and inter-frame redundancy of the color video signal can be eliminated and the data can be compressed. Our simulation experiments show that this algorithm can obtain very good results. -
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