Write a computer program for computing the histogram of an image.
编写一个能计算一张图像直方图的程序。
At the same time, the computer can calculate the percent of pass and the rejection ration, and display the quality fluctuation gram, the quality control figure, histogram.
同时计算出产品的合格率和废品率，并画出质量波动图、质量控制图、直方图。
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