Reversing the WWDC Wall
I took ~50 (rather sloppy) photos of the wall and wrote a program to do image stitching using a cylindrical projection.
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With the flat image and using OpenCV again I detected all the contours (letters) and created a (inverse) mask to remove the blue-ish background and only keep the letters.
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This image was already good enough to run tesseract. In order to get the best results I trained tesseract with the San Francisco Mono font before running it.
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Go find your app phrase here: http://wwdcwall.com you can also get the JSON representation of the wall from here.
