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Feature to determine image too dark opencv

blur = cv2.blur(image, (5, 5))  # With kernel size depending upon image size
if cv2.mean(blur) > 127:  # The range for a pixel's value in grayscale is (0-255), 127 lies midway
    return 'light' # (127 - 255) denotes light image
else:
    return 'dark' # (0 - 127) denotes dark image

Source: stackoverflow.com

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