Explanation on MaxRatio parameter in MatchFeatures fonction

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cedric MAGUETA RUIVO
Hello, I try to understand how is computed the ratio used to thresh ambiguous match in MatchFeatures fonction with surf descriptor. I take a look on OpenCV FLANN fonction and this fonction only return a parameter call distance. but matlab return a matrix of n*2 call Metrics. is anyone know how the metric array and the ratio are computed? kind regards

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