Efficient Intra-Prediction Mode Selection for 4x4 Blocks in H.264
Bojun Meng, Oscar C. Au, Raymond Chi-Wing Wong, Hong-Kwai Lam · Rare & Special e-Zone (The Hong Kong University of Science and Technology) · 2003
In the upcoming H.264, intra-prediction for 4x4 and 16x16 blocks is used to compress I-frame. However, we need to choose one of the 9 prediction modes for each 4x4 block. The full search (FS) algorithm to select the mode is computationally expensive. In this paper, an efficient intra-prediction mode selection (EIPMS) method is proposed based on partial computation of the cost function, selective computation of highly probable modes, early termination, and variable threshold setting. The proposed EIPMS can reduce the complexity considerably while maintaining similar PSNR and bit rate.