A optimization of intra-prediction mode selection algorithm based on H.264

In H.264, intra-prediction is used to improve the efficiency of I-frame encoding. There are many kinds of intra-prediction modes in H.264, so we have to select a suitable prediction mode for each frame, and the result of our selection must transfer to the decoder. So it needs extra bites to transport the mode selection information. In order to reduce the amount of mode selection information and the complexity of encoding, we optimize the method of mode selection in intra-prediction in this paper. In the method, it first calculates and quantifies the prediction residual matrix, then according to the result of quantified to select an optimal prediction mode. Experiment results show that the improved method can obviously speed up the encoding rate and has a good practicability.