这是因为运动估计执行到子像素分辨率。
This is because motion estimation is performed to sub-pixel resolution.
该方法简单有效，可以达到子像素级配准精度。
The proposed approach is simple and effective, it can achieve an accuracy up to sub-pixels.
该方法简单有效，可以达到子像素级配准精度。
The proposed approach is simple and effective, it can achieve an accuracy up to sub-pixels.
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