OpenCV doesn't have any ML algorithms builtin that I know of, but the article is pretty vague there eh? Either way, document-scanning from a phone camera is no

OpenCV doesn't have any ML algorithms builtin that I know of, but the article is pretty vague there eh? Either way, document-scanning from a phone camera is no picnic. I tried a little while ago. Memory is kind of hazy, but depending on how well you do the image transformation (automatically[ish] skew to rectangle, etc), image quality might get poor. Then you have to do the actual OCR. Now the only complete OSS solution is Tesseract and it's not a state-of-the-art one. There's also ocrpy, but it's more of a toolkit and it's model needs to be trained (one single-line text when I last checked). So yeah, it's fairly hard to do.