Knowing someone working in one of those companies it's mainly computer vision (based on recent machine learning techniques), and they're accurate for particular

Knowing someone working in one of those companies it's mainly computer vision (based on recent machine learning techniques), and they're accurate for particular conditions only (not working on all crops yet). The difficulty is on handling edge cases (unsurprisingly), and they're tackling that by collecting a lot of in the field feedback; afaik they send technicians on lot of deployments still.