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from numpy import uint8
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def rgbToGray(img):
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# 得到(r,g,b)三通道
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b = img[:, :, 0].copy()
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g = img[:, :, 1].copy()
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r = img[:, :, 2].copy()
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# 灰度化
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out = 0.2126 * r + 0.7152 * g + 0.0722 * b
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out = out.astype(uint8)
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return out
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