对修改后的分割函数做分水岭变换计算。

Compute the watershed transform of the modified segmentation function.

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修改分割函数，使其仅在前景和后景标记位置有极小值。

Modify the segmentation function so that it only has minima at the foreground and background marker locations.

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至于定义嘛，实际上，就是把区域分割成许多小区域，再把一点的函数值乘以那个小区域的面积，然后对乘积求和。

And the definition, actually, is we split the region into lots of tiny little pieces, we multiply the value of a function at the point times the area of a little piece and we sum that everywhere.

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