Instead of explaining this to you, I will just let this Google interview do it. 
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Computational Photography Removes Glare
- Thread starter amirm
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Is it part of their desktop photo application?
OP
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I think it only works on the phone.
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I have done this a few times, and used pretty much the same techniques to get the glare out. Of course it took sometimes an hour per photo.
I just downloaded the app and tried it. It works pretty well. Not quite as amazing as the video nor quite as simple. Still after a half dozen shots you figure it out. The results ran anywhere from acceptable to great. It works much better if you can light up the photo so the phone flash is not needed. The second thing to know is when you move the phone to get the 4 dot views in the corner, it works much, much better if you are careful to keep the phone the same distance from the photo and even more important parallel to the photo for all four points. You also can adjust the corners and cropping afterwards.
So considering you could get good ambient light, a flat surface and knock out 3 or 4 of these per minute with glare handled, not too shabby. Now it also works nicely for highly resolved document scanning.
I just downloaded the app and tried it. It works pretty well. Not quite as amazing as the video nor quite as simple. Still after a half dozen shots you figure it out. The results ran anywhere from acceptable to great. It works much better if you can light up the photo so the phone flash is not needed. The second thing to know is when you move the phone to get the 4 dot views in the corner, it works much, much better if you are careful to keep the phone the same distance from the photo and even more important parallel to the photo for all four points. You also can adjust the corners and cropping afterwards.
So considering you could get good ambient light, a flat surface and knock out 3 or 4 of these per minute with glare handled, not too shabby. Now it also works nicely for highly resolved document scanning.
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As it is will just work on the phone. It wasn't exactly clear in the video. You position and snap the picture with a circle center of the photo. Immediately 4 other circles near the corners show up. With the phone still viewing the photo, you move the phone until those circles are centered then move to the next one once the circle turns blue. An arrow guides you. This gives the phone the shots from multiple angles and lets it stitch together. And lets it work around the glare. Which is why keeping distance and the phone parallel to the photo gives better results. Otherwise you get fuzzy centers or a washed out area on one side or the other.
Now I can imagine having seen it work, one could watch glare, take 4 snaps of a photo with glare in different areas and a program could do all the rest just the same. It is also true with care you usually can get around glare with most photos unless they are large 8x10 size.
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