该请求需要一个不超过100 KB的二进制图像文件。
A binary image file not bigger than 100 KB is necessary for this request.
用于梯度边缘图像转换成一个二进制图像边缘。
That is used to convert a gradient edge image into a binary edge image.
这必须是这样，否则对全局变量的赋值会改变你的磁盘上的二进制图像。
This must be the case, otherwise assignments to global variables would change your on-disk binary image.
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