关键词: H．264 模式选择 编码效率 零块检测

Abstract:

H. 264 is the new international standard for video coding. It has great advantage on encoding efficiency compared with other standards： under the sam e reconstructed picture quality, H. 264 can save about 50% blt-rate comparedwith those of H. 263＋＋ and MPEG-4 Part 2. But the high encoding efficiency y is acquired by heavily increasing computation. A new mode selection method based on the zero-detection for H. 264 is proposed in this paper. This new method will give up the encoding for some small coefficient blocks forwardly. Experimental results show that the new method improves the encoding effici ency of high bit-rate in H. 264 without causing the decrease of subject picture quality, and decreases the encoding time of mid-low bit-rate in H. 264.

Key words: （H. 264, mode selection, encoding efficiency, zero-detection）