A key difference is that this algorithm does not give the same value at the sampling point but gives the same average value in unit area of each pixel.
此算法的关键不同点在于不是让算法结果在采样点的值等于原采样值，而是在一个象素大小的单位面积上得到的平均值等于原采样值。
A key difference is that this algorithm does not give the same value at the sampling point but gives the same average value in unit area of each pixel.
此算法的关键不同点在于不是让算法结果在采样点的值等于原采样值，而是在一个象素大小的单位面积上得到的平均值等于原采样值。
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