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首页> 外文期刊>Journal of visual communication & image representation >Improved motion vector scaling technique based on half-pixel offset compensation
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Improved motion vector scaling technique based on half-pixel offset compensation

机译：基于半像素偏移补偿的改进运动矢量缩放技术

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摘要

It is observed that there exists a half-pixel offset in vertical direction between top and bottom fields in interlaced sequence, and this half-pixel offset has an impact on performing motion vector scaling in mul-tipicture motion-compensated prediction. However, the impact caused by this half-pixel offset is processed inconsiderately during motion vector derivation in the up-to-date video coding standards, where temporal motion vector predictor usually derives its forward or backward motion vector by performing motion vector scaling based on temporal distance. In this paper, an improved motion vector scaling technique is proposed to compensate the impact caused by the half-pixel offset between top and bottom fields. Motion vector scaling is performed on corresponding coordinates which represent the position relationship between top and bottom fields properly. Experimental results show that the proposed motion vector scaling technique improves coding efficiency for interlaced sequence, especially for bi-predictive pictures.
机译：可以看出，在隔行扫描序列的上下场之间在垂直方向上存在一个半像素偏移，并且该半像素偏移对多画面运动补偿预测中的运动矢量缩放具有影响。然而，在最新的视频编码标准中，在运动矢量推导过程中，不慎处理了由该半像素偏移引起的影响，其中，时间运动矢量预测器通常通过基于时间的运动矢量缩放来推导其前向或后向运动矢量。距离。在本文中，提出了一种改进的运动矢量缩放技术，以补偿由顶部和底部场之间的半像素偏移引起的影响。运动矢量缩放在相应的坐标上执行，这些坐标正确地表示了顶部场和底部场之间的位置关系。实验结果表明，提出的运动矢量缩放技术提高了隔行序列，尤其是双向预测图片的编码效率。

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