Here is a good comparison of two candidates: https://www.reddit.com/r/photoprism/s/Mw7UdIGBo4 I'm not sure this will work on a raspberry pi though
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In any case, check if the camera apps can take raw images, that's the first step to better pictures on older phones. I like ProShot but I don't know if it's working on your phone.
I didn't understand if you want a desktop GUI or a webUI, there are a lot of projects dealing with ai upscaling, I don't know which of those you can get to run on the RPI.
https://github.com/AbeerVaishnav13/super-resolution
Holy shit You're replacing ROMs on Android what year is it? Why don't you just get a modern phone what do you have against that. Are you one of those people that's afraid of 5G?
Wish I could. Sadly, they don't make small, pocketable phones in 2023 (outside of some suspect Chinese brands and so-so iPhones), so am recycling older stuff I have to hand.
Older devices work just fine even now but you more or less have to degoogle them / FOSSify them.
Lol, you make it sound like installing LineageOS and removing stock bloatware is some kind of tin-foil hat lunacy....while posting on a subreddit dedicated to hosting your own server / cloud.
I wrote an upscaler that runs super great on CPU. However, I have not tried ARM. Hit me up and I'll look into it.