9 July 1976 Synthesis Of Nonlinear Non-Monotonic Functions In Optical Image Processing
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When halftone screens are used to realize monotonic or non-monotonic nonlinear point transfer functions in a coherent optical system, the screens are usually composed of periodically repeated cells which are themselves monotonic in density. This is not necessary, and an algorithm for generating non-monotonic cells yielding a desired transfer function in the first diffraction order is described. In practice, the photographic operations are non-ideal and change the nonlinear characteristics from input to output. The effects of low film gamma and low film saturation density can be calculated, and, to some extent, compensated a priori.
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S. R. Dashiell, S. R. Dashiell, A. A. Sawchuk, A. A. Sawchuk, } "Synthesis Of Nonlinear Non-Monotonic Functions In Optical Image Processing", Proc. SPIE 0074, Image Processing, (9 July 1976); doi: 10.1117/12.954704; https://doi.org/10.1117/12.954704


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