I'm searching for a document scanner SDK for mobile (iOS and Android) that is capable of detecting the edges of a document and then auto-crop it. I know a few licensed SDKs like Scanbot, but is there any open source option?
Take a look at this blog post which shows you how to "Build a Kick-Ass Mobile Document Scanner in Just 5 Minutes".
The tool chain being python and OpenCV.
- Detect Document Edges
- Rotate and correct perspective
- All Free, Gratis & Open Source.