An Adaptive Intra Prediction Algorithm in Spatial Domain for H.264/AVC
Guo Bao · Chinese Journal of Computers · 2005
Intra prediction has been adopted in some video coding standards as an effective solution to increase the coding efficiency of I frame.In H.264/AVC,the current block is predicted in spatial domain,which has a better performance in regard to the traditional prediction methods in frequency domain,but its computation complexity is much larger.By great number of experiments,authors found that the prediction modes of spatial adjacent blocks in H.264/AVC are highly correlated,and this kind of correlation can be well represented by the SAD value.Based on these two characteristics,a novel fast intra prediction algorithm in spatial domain is presented in this paper.It utilizes the above characteristics to predict the intra prediction mode of the current block,and use the half-way stop technique to terminate the process of intra prediction adaptively.Experimental results show that with little degradation in the coding gain,the computational load of the proposed algorithm can achieve about 7% of original algorithm.