I regularly use Microsoft Office Lens for scanning in receipts and tickets as it’s remarkably good at automatically cropping and correcting skew, and the results are usually very impressive.
Yesterday I used the whiteboard option for the first time in quite a while, and I’d forgotten how good that is too. It managed to process this photo:
into this:
Yes, the second image is the automatically processed version of the first.
Microsoft Office Lens is available for free on Windows Phone, iOS and Android.
Imorital Tech Blog 
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