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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?

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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
  • Crop
  • All Free, Gratis & Open Source.
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  • Thanks, I had that already, but that won't run on mobile. We have to create the app an translate the Python code to Java/Swift and find similar libraries. Using that code as a backend service isn't an option. Anyway, it doesn't look easy. – Rafael Apr 17 '19 at 20:31
  • @Rafael OpenCV runs on mobile and for your own use there are python environments available on mobiles - a good possibility is Kivy - kivy.org/#home – Steve Barnes Apr 18 '19 at 4:50
  • I understand. But I already have the two mobile apps, for the two platforms. I'm just adding functionality and Kivy isn't something very popular. If that same code was implemented in Java + OpenCV, then ok. I will probably invest on that and code that solution in Java/Kotlin and Swift. – Rafael Apr 18 '19 at 14:22

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