I personally don't have any experience with this but just thought I would share what I found while researching this. Not sure about using ML algorithm but you

I personally don't have any experience with this but just thought I would share what I found while researching this. Not sure about using ML algorithm but you could look into “edge enhancement”. I think edge enhancement combined with a bit of tweaking of contrast, sharpness should give you good results. Sharpening Filters is another one to look at. If you are looking to do this in an app, GPUImage library has sharpening filters. It might have edge enhancement filters too though I am not 100% certain. Search for “edge enhancement online” for example for some tools. You can also look for their algorithms too. Photoshop and Photopea probably do them too. Here’s some example I tested with an online image with edge enhancement. Your customers probably give you better quality and size images than this: Using this tool: https://pinetools.com/image-edge-enhancement https://pinetools.com/image-edge-enhancement Uploading this image: https://listverse-wpengine.netdna-ssl.com/wp-content/uploads/2019/06/4a-fingerprints-922820626.jpg https://listverse-wpengine.netdna-ssl.com/wp-content/uploads... gives this result: https://i.imgur.com/3TvSVGU.png https://i.imgur.com/3TvSVGU.png