基于AVS的变换域帧内转码研究

Study on Intra-Transcoding for AVS in Transform Domain

根据MPEG-2与先进音视频编码(AVS,Advanced Coding of Audio and Video)标准在帧内预测中的不同点,介绍了一种基于变换域的帧内预测转码算法。新算法提出一种新的变换域转码结构,通过矩阵变换计算出AVS帧内预测的各种模式所对应的离散余弦变换(DCT,Discrete Cosine Transform)预测矩阵,推导出DCT域到AVS整数变换域的系数转换矩阵,同时给出DCT域内预测矩阵转换所需的运算量。实验结果表明,提出的帧内预测转换方法可以使计算复杂度降低50%,达到实时转码的要求。

Based on the differences between intra predictions of MPEG-2 and AVS standards,an intra prediction transcoding algorithm based on transform domain is described in this paper.A new transcoding structure in transform domain is proposed for the algorithm.By matrix operation,the corresponding DCT prediction matrices of all AVS intra prediction modes are calculated,and the transformation matrix from DCT domain to AVS integer transform domain is deduced.Meanwhile the computation of intra prediction matrix transforming in transform domain is given and analyzed.Experimental results show that the proposed intra prediction transformation algorithm could have a reduction of 50% calculation and meet the demand for real-time transcoding.