编写一个自动估计阈值的全局阈值化程序。程序的输出为分割后的的二值图。并要求用上面编写的阈值化程序对图中的目标进行分割。

-Write an automatic estimate the threshold of global thresholding procedure. Output of the program for the segmentation of the binary image. Written above the threshold procedure to split the target figure.