Synthesis Of Nonlinear Non-Monotonic Functions In Optical Image Processing

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Abstract
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.© (1976) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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