How to sort photos by similarity (by faces)?

Question

Java

There are many Java libraries that use neural networks: tensorflow, opencv wrapper, Google Cloud Vision API . For example, recognizing faces is not a problem. I have several photos in my folder and I need to sort them by similarity (for example, by faces). How can I sort them? What library can be used? Can be explained in words.

Answer 1

To sort by faces, you can apply the following algorithm:
1. Finding a face in the image (take something from the tf detection API or from openCV, there is now YOLOv2 and SSD or haar cascades, maybe something else was added, like there is in dlib something else).
2. Calculation of descriptors (from openCV: sift, surf, etc., although there are neurons specifically for calculating the feature vector for faces, I don’t remember the names).
3. Choice of measure of similarity (Euclidean distance, Hamming distance...).
4. Classification, such as knn, (having previously trained on a sample) or clustering.