All Zero Block Detection Based on Statistics for AVS-M Intra Frame Prediction

AVS-M is a standard for mobile video transmission of AVS series of standards for audio and video compression in China. AVS-M has nine intra prediction modes just as the widely studied H.264. Since H.264 and AVS-M has DCT transform for 4times4 blocks, a similar all zero block detecting for H.264 has also been proposed for AVS-M. However, the technique may not the best one for all zero detection in practice as discovered in our simulation. We proposed, in this paper, a new technique for detecting all zero block for AVS-M based on statistics and we found this technique is very simple and efficient. Based on this technique, early termination for intra prediction is carried out and computation is substantially reduced. The simulation results show that the technique can speed up the encoding process without loss of coding PSNR and bitrate efficiency.