摘要
在研究了离散余弦变换的频域分辨率与时域分辨率的转换关系的基础上,提出了一种基于自适应降阶IDCT的低复杂度视频解码方法.根据DCT系数块中非零系数的个数,对DCT系数进行自适应降采样.对降采样后的DCT系数块进行降阶的IDCT变换,再对变换后的块在时域中进行线性插值,最终实现解码.降阶IDCT处理降低的解码时间弥补了插值耗费的时间,还使解码的整体复杂度降低.测试结果表明,该方法解码时间可以节省60%-80%,而PSNR损失仅为0.3～0.7dB.
Studying of the transform relation of resolution of frequency domain and that of time domain,a new video decoding method is proposed to reduce the computation complexity based on the self-adaptive reduction of dimension IDCT.According to the number of non-zero coefficients within one DCT block,down-sample the DCT block.Then the IDCT of reduction of dimension is carried out to the down-sampled block.Through inserting values linear in time domain,decoding is completed.The time saved by IDCT of reduction of di...
出处
《电子器件》
CAS
2007年第5期1670-1672,1676,共4页
Chinese Journal of Electron Devices
关键词
视频解码
自适应
降阶
IDCT
计算复杂度
video decoding
self-adaptation
reduction of dimension
IDCT
computation complexity
