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How to use BOWImgDescriptorExtractor in python - openCV ?

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Hi, I am a beginner to openCV and am trying to use python-openCV. I have version 2.4.10. In this I am trying to use the BOWImgDescriptorExtractor as follows : extractor = cv2.BOWImgDescriptorExtractor(cv2.SURF(), cv2.BFMatcher(cv2.NORM_L2)) and am getting the following error : extractor = cv2.BOWImgDescriptorExtractor(cv2.SURF(), cv2.BFMatcher(cv2.NORM_L2)) TypeError: Expected cv::DescriptorExtractor for argument 'dextractor' Not sure how to resolve this since the namespace convention is not used in python.

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