The Secret Of Google's Book Scanning Machine Revealed - As A Matter Of Fact Blog : NPR - 28 views
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Google created some seriously nifty infrared camera technology that detects the three-dimensional shape and angle of book pages when the book is placed in the scanner
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Now anyone who's ever opened a book knows it's next to impossible for a book to lie flat without some sort of device. One solution to the problem was to use glass plates that individually flattened each page, but this method wasn't very efficient. The other solution was to chop off the book's binding, but that method destroyed the book.