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I would like to use detector_descriptor_matcher_evaluation.cpp founded under opencv\sources\samples\cpp for evaluating surf keypoint descriptor and calculate Recall-precision curve. But I do not know the input argument. I downloaded the dataset of mikolajczyk and readed the paper http://lear.inrialpes.fr/pubs/2005/MS05/mikolajczyk_pami05.pdf But I do not know how to do this evaluation. what is the inputs for this code? where can I find ground truth? what other data I need than dataset of mikolajczyk ? Thank you so much for cooperation