How to group / sort photos by similarity?

Question

Image processing

Greetings.
There are many photos and for certain purposes I would like to sort them, for example, by color similarity or other visual feature, as if by a smooth gradient, so that you can take several consecutive photos from anywhere in the list and they would be similar to each other.

Let me give you a simple example to understand.
There are photos of cats:

Sort them and get them sorted by color of cats:

What programs are there for this?

Answer 1

Are you looking for a ready-to - use taxologizer or would you like to create your own?
If the latter, then analyze the images:

1. find dominant color
   How to find dominant color in opencv?
   https://stackoverrun.com/ru/q/7910222
   
2. light level
   https://opencv-python-tutroals.readthedocs.io/en/l...
   
3. get a description of the main object with an advanced algorithm
   https://www.pyimagesearch.com/2017/09/11/object-de...
   

And cluster according to the obtained characteristics.
https://api-2d3d-cad.com/ident_by_color_texture/
https://habr.com/ru/post/321216/

Answer 2

There are simple ways. For example, batch compress all pictures to a resolution of, say, 3x3 or 5x5 pixels (depending on the number of pictures). Then you write out the numbers, first the central pixels, the middle ones, and lastly the extreme ones. Next, convert each pixel from RGB to HSL or HSV, writing the value of each channel to a separate number for each channel. As a result, each picture will correspond to three long numbers by which pictures can be sorted, and they will be similar in color. Pictures where three numbers are the same can be considered similar duplicates. If I wrote not sensibly enough, write a comment, I can chew the algorithm schematically.
UPD I
also remembered the utility for comparing images, included with ImageMagick. Even in the bookmarks, a small guide has been preserved on it . But, at one time I didn’t work with it, because it worked too slowly and the quality of the magic provided was no better than the scripts that I wrote myself. But maybe everything has changed and it's worth trying the tool in action again...

Answer 3

The DeepFaceLab package has a batch file that correlates photos by similarity. Works, it seems, through xnView. You can view