Abstract
In a nonlinear joint transform correlator, the joint power spec- trum (JPS) is detected by a CCD camera before nonlinear processing. Since the JPS is a high-dynamic-range image, it cannot be recorded by a CCD camera of narrow response range. The multi-intensity imagery technique is proposed to cope with the detection of the JPS by a CCD camera by multiple recordings at different intensities. With the multi- intensity imagery an effective nonlinearity by interframe processing of data block ''cut and paste'' can be performed easily to build a high- contrast JPS. The technique can improve the correlation performance significantly by transferring a part of dc energy to harmonic terms of interest. The involved theoretical explanation and experimental demon- stration are given. © 1996 Society of Photo-Optical Instrumentation Engineers. Subject terms: nonlinear joint transform correlators; high-dynamic-range images; multi-intensity imagery; oversaturation/cutoff effects; interframe processing.
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