Polarization restraint based fast motion estimation approach to stereoscopic video coding
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摘要: 分析了平行双目立体摄像系统的偏振约束特性,提出了一种基于偏振约束的立体视频快速运动估计算法.左通道和右通道分别作为基本层和增强层,对右通道结合视差估计和运动估计得到最优的运动矢量预测值初值,采用不同的运动搜索方法,确定右通道最终运动矢量.若最优的运动矢量预测值是由视差估计得到的左通道运动矢量,则根据偏振约束,左右通道图像对应编码块的运动矢量在垂直方向上的分量相等,因而右通道只在水平方向上进行小范围的运动估计搜索,从而大大降低了右通道运动估计的计算复杂度.实验结果表明,在相同条件下,采用该算法编码一帧图像的运动估计平均时间分别只有采用全搜索块匹配算法、钻石搜索法和三步搜索法的0.27,0.58和0.67倍,编码速度得到显著提高.Abstract: An efficient polarization restraint based fast motion estimation algorithm for stereoscopic video coding was proposed after analyzing polarization restraint principle in a parallel binocular-camera system. The left- and right-view images were compressed as the base and enhancement layer respectively in the proposed scheme. An optimal motion vector predictor for the right channel was attained after combining disparity estimation and motion estimation(ME), and a final motion vector was got by using different motion searching method. If the final motion vector predictor was got by referring to that of left channel, then ME searching only in horizontal direction within a small range was sufficient according to polarization restraint, and thus the ME complexity in the right view channel could be greatly reduced. Experimental results show that the ME time of proposed algorithm is just 0.27, 0.58 and 0.67 times of that of full search block matching algorithm, diamond search and three step search respectively, accelerating coding speed greatly.
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Key words:
- polarization restraint /
- stereoscopic video coding /
- fast motion estimation /
- H.264
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