Abstract:

To improve the encoding speed of H.264,a fast inter-frame mode selection algorithm is proposed.With image difference as a standard measure of level of image motion detail,the best inter-frame mode is selected directly,so as to avoid the constant calculation of each inter-frame mode and their comparison.Experiment shows that,without much loss of image code rate and PSNR,inters prediction time is reduced by 75% compared with the original algorithm,and D1 image real-time encoding in H.264 is realized.

Key words: H.264;difference mocroblock;inter-frame prediction mode;PSNR;image coding speed