摘要
基于DCT变换的能量聚集和方向特性,首先利用AC系数对块尺寸进行预先选择,然后利用AC系数的方向性对16×16块进行模式预先选择,接着利用空域相关性对4×4块进行快速模式选择,有效缩小了模式选择的范围。实验表明,与现有同类算法相比,在质量几乎相当的情况下,本算法速度明显提高。
By using of the features of DCT coefficients in frequency domain and the correlation of the predictive mode in spatial domain, the proposed algorithm evaluated the complexity of encoding block and selected encoding block size firstly, computed the texture direction and pre-selected most possibly prediction mode of 16×16 block secondly, and then got the neighbor block＇s optimum mode and narrowed mode selection range of 4×4 block. The experiments show that, compared with existing algorithms, in the case of almost equal quality, the speed of the algorithm is significantly im- proved.
出处
《通信学报》
EI
CSCD
北大核心
2012年第7期143-150,共8页
Journal on Communications
基金
国家自然科学基金资助项目(60821001)
北京邮电大学博士后基金资助项目(20090R01)~~
关键词
帧内预测
频域分析
空域分析
模式选择
intra prediction
frequency domain analysis
spatial domain analysis
mode selection
