Color Video 4D-MDCT Coding based on Content Statistics
基于内容统计的彩色视频4D-MDCT编码

This paper presents a new coding method based on content statistics according to four-dimensional matrix and four-dimensional matrix DCT (4D-MDCT) theories in order to increase the compression ratio of color video sequence. First, four-dimensional matrix, which is constructed by color video sequence, is divided into submatrices and 4D-MDCT is performed to the submatrices. Then four-dimensional matrix quantization is applied to the transformed coefficients. In order to use the correlation between the inter color frames and intra color frames, statistics on quantized four-dimensional submatrix coefficients is performed to search four-dimensional submatrices which have identical quantized coefficients. Only the first one of these identical quantized four-dimensional submatrices is coded. When the first quantized four-dimension submatrix is coded, conventional runlength coding and entropy coding are performed. Experimental results proved that the compression ratio can be increased greatly and the high PSNR is preserved. Because conventional runlength coding and entropy coding are simple, and easy to be realized by using hardware, the method in this paper has a prosperous future.