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提出了一种新的用于视频编码的变尺寸宏块运动估计方法。该方法通过粗尺度 16×16 的当前块和邻域块运动矢量之间的差值 S 判断场景运动的复杂度,再根据差值 S 和当前矢量,决定宏块尺寸。场景运动平稳的部分采用 16×16 的宏块,复杂的部分采用 8×8 或 4×4 的宏块。实验表明,低码率条件下,采用普通运动补偿算法,该变尺寸宏块运动估计方法的预测帧的平均 PSNR 值比常规的固定尺寸块运动估计约提高 1.1-2.7 dB,并显著降低了方块效应。
A new method for motion estimation of variable size macroblocks is proposed for video coding. In this method, the complexity of the scene motion is judged by the difference S between the current block of the coarse scale and the motion vector of the neighborhood block, and the size of the macro block is determined according to the difference S and the current vector. The stationary part of the scene uses 16 × 16 macroblocks and the complex part uses 8 × 8 or 4 × 4 macroblocks. Experiments show that under the condition of low bit rate, the average PSNR of the prediction frame of the variable size macro-block motion estimation method is increased by 1.1-2.7 dB compared with the conventional fixed-size block estimation using the ordinary motion compensation algorithm, and the square effect.