中文说明：两次利用大津法对图像进行分割，将前景与背景，白色区与背景分割开，并二值化。
English Description：
The Otsu method is used twice to segment the image. The foreground and background, the white area and the background are separated and binarized.
Using Otsu method to segment image twice
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中文说明：两次利用大津法对图像进行分割，将前景与背景，白色区与背景分割开，并二值化。
English Description：
The Otsu method is used twice to segment the image. The foreground and background, the white area and the background are separated and binarized.