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

Question

hp 2018-9-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/420835-how-to-find-precision-and-recall-for-a-image-retrieval-system

评论： hp 2018-9-28

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.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

hp 2018-9-26

matlab2013

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2018-9-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/420835-how-to-find-precision-and-recall-for-a-image-retrieval-system#answer_338503

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.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

hp 2018-9-28

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...

请先登录，再进行评论。