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支持在灰度图和带透明通道的图片中查找(最终都是在灰度图中查找,但原来是直接BGR2GRAY,现在先判断传入图片类型,再决定如何转换)
btw, change print style from python2 to python3 in example.py
另外,把example.py里的print改成python3风格的了