Comment by mreiner

I had to scan some historic books and papers for a research project and tried a couple desktop apps and python libraries. Still the Android scan to document worked better, so I just photographed all pages which was faster, then wrote an unsupervised python script to loop through the images in the camera folder and send them to Google Document AI for OCR, added some metadata and merged them. This outperformed the other even commercial solutions I tried by far and was dirt cheap. If you're interested I'll clean up the code and put it on github.