[shawabawa3]

estimating from a photograph is always going to have huge error because you just cannot know e.g. the size of the plate without some external reference

[wnorris510]

Modern phones have LiDAR that give you the near exact volume and dimensions of everything on a plate. That's what we do:

https://www.snapcalorie.com/

We co-authored a paper on this with Google AI and showed it got about 2x the accuracy of a nutritionist because of it.