The image of a word is taken and the two-dimensional discrete Fourier transform of the image is computed. The transformed image is filtered to the first three harmonics, with both real and imaginary components. These components then make up a total of 49 unique vectors which defines a 49 orthogonal vector...http://www.google.com/patents/US4764973?utm_source=gb-gplus-sharePatent US4764973 - Whole word, phrase or number reading
