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I am currently trying to make multi-class classifer for basic geometric shapes(circle, square , rectangle , triangle). I wanted to use HOG for the samples in tranining set (200 HOGs for each shape) and use it in SVM classifier with one vs all mechanism. but as im new to pencv , i have no idea how will use HOG and one vs all mechanism, can someone please guide me on this issue ?

I am currently trying to make multi-class classifer for basic geometric shapes(circle, square , rectangle , triangle). I wanted to use HOG for the samples in tranining set (200 HOGs for each shape) and use it in SVM classifier with one vs all mechanism. but as im new to pencv , i have no idea how will use HOG and one vs all mechanism, can someone please guide me on this issue ?