Research and Improvement of Selection Algorithm Based on the H. 264 Intra- prediction Model

摘要

Intra prediction is an important part of H.264. However, in order to determine the optimum model ,it usually costs too much time to compare each performance mode. Therefore, the computational- complexity becomes the bottleneck of the H.264 intraframe coding. This paper presents a fast mode decision algorithm based on the analysis of characteristics of H.264 intra-frame prediction algorithm. By using the.texture characteristic of the image itself, the preset threshold will separate the Intrn16 × 16 and 4×4 prediction mode. A rapid- computation using the relevance between adjacent blocks and adjacent direction prediction model will be made under 4×4 mode. The experimental results showed that, by the premise of guarantee of image quality, the algorithm can effectively improve the encoding speed of H.264.