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�������պ����ѧѧ�� 2006, Vol. 32 Issue (05) :617-620    DOI:
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�Ѿջ�, ���, ������*
�������պ����ѧ �����ѧԺ, ���� 100083
Fast motion estimation algorithm for H.264 with multi-references
Pu Juhua, Xiong Zhang, Liu Yongli*
School of Computer Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ���H.264���˶����Ƽ�����̫�������,ͨ���о�����֤��Ƶ��֡�ο�ʱ���˶�������,�����һ�ֻ�����Ч����Ŀ����˶������㷨(VRF,Valid-Region-based Fast Motion Estimation). ���㷨�ڵ�һ���ο�֡������������(3SS,3-Step Search)���ٹ��������ؾ����˶�ʸ��, ���Դ˶���һ����Ч����, �ο�����֡ʱ, �ڸ���Ч���������Ľ���3SS����; Ȼ��ѡ����Ѳο�֡; �������ѡ�����Ѳο�֡����Ч��������ȫ��������Ӧ�ķ������ؾ��ȹ���. ʵ��֤��, ��H.264ȫ�������, ���㷨���˶�������������������82%����, ���ָ�����(�÷�ֵ�����(PSNR,Peak Signal to Noise Ratio)����)ƽ��ֻ�½�0.24?dB,��������ֻ����8.81%; ����һ�������֡ѡ������㷨���, ���㷨����������������39%,��������ƽ���½���5.17%, ���ָ�����ֻ�½�0.08?dB.
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Abstract�� H.264, in spite of its high quality, is very time-consuming due to its complex motion estimation. A fast motion estimation (FME) algorithm called valid-region-based FME (VRF) was proposed by exploring the motion continuity property in multiple reference frames (RFs). VRF used 3-step search(3SS) FME in the first RF and restricts 3SS FME in other RFs to select the best RF. Due to motion continuity, it employed full search in the best RF only in a much smaller area, called valid region. Experiments were done to justify the motion continuity property. Results show that, compared with H.264 full search, VRF reduced the number of search pixels for motion estimation up to 82% while it decreased peak signal to noise ratio(PSNR)0.24?dB and increased bit-rate 8.81% averagely. Compared with another FME, VRF reduced the number of search pixels for motion estimation up to 39% and bit-rate 5.17%, with the PSNR decreased 0.08?dB averagely.
Keywords�� motion estimation   video   multi-references   valid region     
Received 2005-06-03;
About author: �Ѿջ�(1976-),Ů,�Ĵ�������,��ʦ,pujh@buaa.edu.cn.
�Ѿջ�, ���, ������.H.264�ж�ο�֡�����˶������㷨[J]  �������պ����ѧѧ��, 2006,V32(05): 617-620
Pu Juhua, Xiong Zhang, Liu Yongli.Fast motion estimation algorithm for H.264 with multi-references[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(05): 617-620
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2006/V32/I05/617
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