Software To Interpret a pattern within an Image

FROM : Frederick C. Lee
DATE : Sat Nov 13 20:29:15 2004

Greetings:
   Does anyone know of a software than can find a string pattern within
an Image (GIF, JPEG, etc.)?

Example scenario: Find 'Ann Arbor' in map of Michigan.

I need to know the coordinates and preferably the length (pixels) of
the found (NSString) pattern within the image.

Ric.