Correlation methods in systems for photoelectric recording of holographic information

A theoretical analysis is made of the correlation methods for the search and separation of a signal from the background of noise. The initial information in the form of a Fourier transform is imaged onto the sensitive surface of a detector. Information reaches a photoelectric detector with a large sensitive area and use is made of a transient reference wave such that each element of the detector area is acted upon by a reference wave of definite frequency. Spatial optical information is processed by matched filters placed in the reference wave channel. Spatial pattern of the output current from the detector can be used to extract a signal and find its position in the input plane.