From the OneNote team at Microsoft:
Office Lens is a handy capture app that turns your smartphone into a pocket scanner and it works with OneNote so you’ll never lose a thing. Use it to take pictures of receipts, business cards, menus, whiteboards or sticky notes—then let Office Lens crop, enhance and save to OneNote. Just like that—all the scanned images you capture from Office Lens are accessible on all your devices.
Office Lens looks like a really well-made app. I like that you can take a picture from any angle and it will automatically reorient and crop it for you to get rid of any extraneous bits around the content.