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[英]opencv python copy mask region (black or white pixels) onto a BGR image region
[英]Convert an image to black and white mask using opencv python
最简单的方法是从全黑图像开始,并仅用正 alpha 填充区域:
res = np.zeros(image.shape[:2], np.uint8) # black by default
colored_areas = image[...,3] > 0
res[colored_areas] = 255
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