Minlian Xiao 1 Xiong Jiang 2 1 Department of Computer Science and Technology,Hunan Institute of Humanities,Science and Technology,Loudi,China 2 Department of Computer Science,Chongqing Three Gorges College,Wanzhou,China
The motion search algorithm based on zero-block detection was successfully used in H.263,H.26L etc to accelerate the speed of video coding.H.264/AVC is also a video coding scheme based on motion estimation and prediction,so the motion search method based on zero-block detection will also be effective to speed up its video coding.The key of such method is to select the exact threshold for the zeroblock detection so as to improve the speed of video coding with neither causing too much decreasing of picture quality nor causing too much increasing of bitrate in the mean time.Considering the threshold for zero-block detection in H.264/AVC having been proposed was not yet the exact one,the authors analyzed the upper limit of threshold theoretically and gave the range of threshold for the zero-block detection in H.264/AVC,and then deduced the exact threshold for 4X4 luminance block's zero-block detection.Experimental results show that in the module of 4X4 luminance block's transform and quantization,the exact threshold has the same PSNR and bit-rate as that of without zero-block detection in any case.
Exact Threshold for Zero-Block Detection in H.264/AVC;rate;PSNR;
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