A Real-Time Optical Correlating System produces holograms that contain both amplitude
and phase information and have none of the time constraints of the traditional
holographic methods. It has been demonstrated to operate at television field rates
(60 Hz) employing currently available devices of moderate resolution. Using the
System, the holographic matched filter of an input scene is calculated optically
as an analog sum, captured by a charge-coupled device (CCD) camera and transmitted
directly or through a computer to and displayed on a commercially available liquid
crystal display (LCD) device. The correlation plane may be viewed immediately on
a suitable screen because there is no film to process or computer calculations
to be performed. Concurrently with the creation of the holographic matched filter
of the input scene, a Fourier transform of a test scene is produced and both are
imaged on another charge-coupled device camera for any correlation between the
input and test scenes.