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I'm looking to do something like this, basically from an image, find edge of the paper, and transform it so that it becomes rectangle and more readable... similar to phone scanner apps. I intend to use it to scan receipts.

I've seen a lot of tutorials and examples on how to do this using OpenCV, but I thought this is a fairly common task that there might be a library for it already. Don't want to reinvent the wheel. Thanks!

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