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algorithm ambiguity function amplitude aperture applications array autocorrelation azimuth bandwidth bandwidth compression beam bits buffer camera charge coupled devices coefficients coherent optical complex components compression convolution correlation cross-correlation data compression detection detector developed devices diffraction digital image digital image processing display Doppler DPCM electron element encoding equation error film focal Fourier transform Hadamard Hadamard transform hardware hologram holographic optical hybrid IEEE image processing imagery implementation incoherent input lens linear matrix memory microprocessor modulation multiplier noise object operation optical computing optical correlator optical processing optical signal processing optical system output plane parameters pattern performed phase photographs pixel problem processor pulse quantization radar raster ratio real-time reconstruction recorded reference resolution samples scan sensor shown in Figure simulation spatial filtering spatial frequency spectral spectrum subtraction techniques threshold tion two-dimensional vector waveform