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.
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.
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.
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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