中文说明：用自适应阈值法二值化图像，首先将图像分为几个子图像，在每个子图像中求得均值，用此均值二值化本子图
English Description：
Firstly, the image is divided into several sub images, and the mean value of each sub image is obtained. Then the sub image is binarized with the mean value
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中文说明：用自适应阈值法二值化图像，首先将图像分为几个子图像，在每个子图像中求得均值，用此均值二值化本子图
English Description：
Firstly, the image is divided into several sub images, and the mean value of each sub image is obtained. Then the sub image is binarized with the mean value