20. The apparatus of claim 14 , wherein comparing the normalized glyph to the plurality of image prototypes further includes: determining a number of rows in at least a second selected one of the plurality of image prototypes; for the lesser of the number of rows in the normalized glyph and the number of rows in the at least second selected one of the plurality of image prototypes, exclusive-or'ing (xor'ing) pixels of the normalized glyph with corresponding pixels of the at least second selected one of the plurality of image prototypes; accumulating at least a second result of the xor'ing of the pixels of the normalized glyph with the corresponding pixels of the at least second selected one of the plurality of image prototypes; for each row of the normalized glyph and the at least second selected one of the plurality of image prototypes that was not xor'ed, adding to the at least second result a number corresponding to the number of pixels ‘on’ in the normalized glyph or the at least second selected one of the plurality of image prototypes; saving the added at least second result; and determining a minimum of the added result and the added at least second result.
20. The apparatus of claim 14 , wherein comparing the normalized glyph to the plurality of image prototypes further includes: determining a number of rows in at least a second selected one of the plurality of image prototypes; for the lesser of the number of rows in the normalized glyph and the number of rows in the at least second selected one of the plurality of image prototypes, exclusive-or'ing (xor'ing) pixels of the normalized glyph with corresponding pixels of the at least second selected one of the plurality of image prototypes; accumulating at least a second result of the xor'ing of the pixels of the normalized glyph with the corresponding pixels of the at least second selected one of the plurality of image prototypes; for each row of the normalized glyph and the at least second selected one of the plurality of image prototypes that was not xor'ed, adding to the at least second result a number corresponding to the number of pixels ‘on’ in the normalized glyph or the at least second selected one of the plurality of image prototypes; saving the added at least second result; and determining a minimum of the added result and the added at least second result. 21. The apparatus of claim 20 , wherein the outputting of the at least one of the plurality of image prototypes comprises outputting an image prototype corresponding to the determined minimum of the added result and the added at least second result.