In this paper the differential method is introduced to reduce some addition error in test.

对于实验中存在的某些加性误差,可以用差值法减小这种误差.

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The merits and demerits of frame differential method in motional detecting were analyzed and optimized.

详细讨论了运动检测中帧差法的优缺点,并设计了快速实现算法,同时提出了对原有方法的改进.

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