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How calculate recall for images retrieval based euclidean distance method?

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anu
anu on 17 Aug 2018
Commented: Yuvaraj Venkataswamy on 17 Aug 2018
I have images belongs to 5 categories. Each category consist of 100 images. I have calculated three features for each image. The euclidean distance is calculated between query image and training images and retrieved top 20 images. How to calculate recall in this case?
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Yuvaraj Venkataswamy
Yuvaraj Venkataswamy on 17 Aug 2018
https://in.mathworks.com/matlabcentral/fileexchange/37758-performance-measures-for-classification?focused=5240671&tab=function

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