This paper describes a method for detecting any particularcharacter from a variety of different other objects by complexmatched filter using auto-correlation technique. The complex matchedfilter is a Fourier transform hologram of an object to be recognizedwhich is able to record both amplitude and phase of the opticalinformation of the object. A matched filter of a chess board havingone minister was used to recognize the minister from a transparencyof a chess board having one minister and a variety of differentobjects.
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