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How do CamScanner, Genius Scan and JotNot work?

I watched CamScanner, Genius Scan and JotNot and tried to figure out how they work.

They are known as Mobile Pocket Document Scanners. What each of them does is take a picture of the document through the iPhone camera, then they will find the angle / position of the document (because it is almost impossible to take it directly), straighten the photo and adjust the brightness, and then rotate it to pdf. The end result is what looks like a scanned document.

Check out one of the apps here, Genius Scan, in action: http://www.youtube.com/watch?v=DEJ-u19mulI

It looks pretty complicated, but I think someone smart at stackoverflow can point me in the right direction!

Does anyone know how to start something like this? What library or image processing technology do you think you use? Does anyone know if there is anything open source available?

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I found an open source library that does the trick:

http://code.google.com/p/simple-iphone-image-processing

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This is probably quite complicated, and you will likely have to find at least some algorithms or libraries capable of detecting distorted text in bitmap images, analyzing the likely geometric distortions of 2D and 3D in a text image, image processing to correct this distortion using its reverse and DSP filtering for adaptively adjusting image contrast ... plus using the iOS API to take photos in the first place.

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Source: https://habr.com/ru/post/1340474/

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