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how to find precision and recall for a Image retrieval system?

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hp on 26 Sep 2018
Commented: hp on 28 Sep 2018
I have Image retrieval system , i have extracted the features, and testing , training is performed by Multisvm, I obtained Confusion matrix for that... but how to obtain the precision and recall plz help.

Accepted Answer

Image Analyst
Image Analyst on 26 Sep 2018
You have the confusion matrix so that gives you everything you need. What more do you want? How are you defining precision? Is it (# true positives) / (number of images)? Well, you can get that, plus more, from the confusion matrix. Please explain why the confusion matrix is not giving you everything you want.
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hp on 28 Sep 2018
yeah it will give but simply i want that also... can you tell me how to draw ROC curve(for matlab2013a verson) for more than one classes if the classifier used is multi-class svm. as i came to know from the answers that we should consider binary class,keeping first class as one remaining as zero but how to do it Iam not getting plz help...

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