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Seek help for single lowercase letter detection!

We am working on an AR project which requires to detect single lowercase alphabetic letters like a, b, c.....x, y and z. However, we don't want to put markers on top of those letters. We'd like to try if we could directly detect the letters by their shapes and provide digital overlay on a tablet. Currently Vuforia has done well with word detection but not single letters. Does anyone how to make it? Thank yo so much in advance!!!