On Fast Intra Prediction Mode Decision Algorithm for 4 × 4 Blocks in H. 264[J]. Journal of Image and Graphics, 2007, 12(10): 1745. DOI: 10.11834/jig.20071012.
the encoding time is greatly influenced by many factors
such as inter/intra mode decision
motion estimation(ME)
etc. In order to encode the videowith faster speed and beteer quality
this paper only focuses on the intra mode decision in H.264 and presents a fast intra prediction mode decision algorithm for 4×4 blocks in H.264. The proposed algorithm uses: (i) high correlation of RD cost between best prediction mode and its neighborhood prediction mode
(ii) strong correlation between sums of absolute transform differences(SATD) and rate-distortion(RD) performance
efficiently skipping some unlikely prediction modes. Thus
it can complete 4×4 intra prediction by only computing RD cost for four times. The simulation result shows that the proposed algorithm is a good compromise between the coding performance and the encoding speed.