Optimization of parameters in matched spatial filter synthesis

Criteria are provided for the selection of various matched spatial filter (MSF) synthesis parameters: the bias exposure (E(B)); beam balance ratio (K); and spatial frequency band (f*) in which K is set. The signal-to-noise ratio (SNR) and peak intensity (I(p)) of the output correlation are used as measures of optimum correlation and a diffraction pattern sampling unit is used to insure reliable and reproducible data.

Position, rotation, and scale invariant optical correlation

A new optical transformation that combines geometrical coordinate transformations with the conventional optical Fourier transform is described. The resultant transformations are invariant to both scale and rotational changes in the input object or function. Extensions of these operations to optical pattern recognition and initial experimental demonstrations are also presented.

Photodichroic recording and storage material

Three techniques for recording information on NaF are reviewed. H-D exposure curves for several samples are used to record, store, and reconstruct imagery.

Optical processing of pulsed Doppler and FM stepped radar signals

A real-time radar processor with an electron beam addressed KD(2)PO(4) light valve as the input electrical-to-optical transducer is described. The input format, output plane pattern, and the required optical processing of pulsed Doppler and FM stepped radar data on this system are discussed. Experimental output plane patterns with actual radar data are presented. Although these data are processed off-line, the processing is performed at real-time data rates.

Novel hybrid optical correlator: theory and optical simulation

The inverse transform of the product of two Fourier transform holograms is analyzed and shown to contain the correlation of the two images from which the holograms were formed. The theory, analysis, and initial experimental demonstration of the feasibility of a novel correlation scheme using this multiplied Fourier transform hologram system are presented.

Television based fourier holographic system

A system for recording Fourier transform holograms on a television camera for use with an existing realtime reconstruction device is described. Measurements of the system's visibility, associated efficiency measurements, and a general procedure for determining the system's optimum operating point are presented. Initial off-line reconstructions and a comparison of various optical synthesis systems for television based Fourier transform holograms are included.