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A binary-encoded nonlinear matched filter for optical correlation is described. The gray-scale matchedfilter function, transformed by a general type of nonlinearity, is represented in a binary format by a threshold function that changes as a function of the spatial frequency. The output correlation term of the binary-encoded filter is equivalent to the output correlation term of the gray-scale nonlinear matched filter.
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Javidi et al. (1992) studied this question.
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