那么，改变一下区域，把这块移到另一侧，我们得到对xdA的双重积分,是原点那的圆面积乘质心的x的坐标。

So, switching the area, moving the area to the other side, I'll get double integral of xdA is the area of origin times the x coordinate of the center of mass.

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说明：根据输入点组成线和面，并计算组成的凸多边形的质心、面积、是否和指定线交叉等。

The input lines of dots and the surface, and calculate the composition of the convex polygon centroid, area, and whether the specified line cross, etc.

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本文将虹膜散斑的个数、面积、范围和质心位置作为虹膜纹理的属性，然后利用质心的位置进行编码。

In this paper, the number, size and center of the iris' speckle regions are considered as the properties of iris texture.

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