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want to know MSER example

I have some question about using opencv in python. I don't know how to use MSER. I only know is that : mser = cv2.MSER_create() regions = mser.detectRegions(imgGrayscaleScene, None)

what is the second param in detectRegions? Why none? can I add other things? I had search on goolge but can not find some API doc about this function in python. Anyone can help?