Research of H.264/AVC Intra Prediction Mode Fast Decision

Intra prediction is a characteristic in H.264/AVC. The fast decision mode is a significant factor for video coding efficiency in current video coding standard. In this paper, a quickly choose prediction mode method to improve coding efficiency is proposed. According to the characteristics of picture texture, we divide a block with intra 16 × 16 into four sub blocks with intra 8 × 8 using the method. The four sub blocks are transformed into frequency domain. We choose the appropriate intra prediction mode according to the number of zero. The intra 4 × 4 sub blocks mode decision can be obtained by taking advantage of direction relationship. The experimental results show that the algorithm which proposed in this paper can save coding time 30–50% while 0.04 dB reduction of PSNR.