A frequency-multiplexed coherent optical processor is described that can compute the intensity moments of a gray-scale input image. The space-bandwidth product and dynamic range of the system's components are discussed. A major feature of the system is the ability to operate easily on its outputs to obtain bipolar moments and to correct for various component errors, nonlinearities, and nonuniformities.
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Casasent et al. (1982) studied this question.
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