12 January 1977 Techniques And Applications Of Nonlinear Processing With Halftones
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Abstract
Optical analog systems which are capable of doing nonlinear processing have potential application in several areas including equidensitometry and analog-to-digital conversion. One approach to nonlinear optical processing is derived from the idea of halftone printing. This approach to nonlinear processing requires custommade halftone screens. It is important to be able to produce such screens accurately and reproducibly. This paper describes a technique of making a binary-coded halftone screen. The desired continuous-tone screen is obtained as an aerial image by spatial filtering the binary mask. Techniques of microlithography have been advanced to such a state that it is possible to produce binary masks which cannot be adequately imaged by lenses. This paper discusses a method of circumventing this limitation. This is done by a means of self-imaging which incorporates the equivalent of low-pass spatial filtering.
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T. C. Strand, "Techniques And Applications Of Nonlinear Processing With Halftones", Proc. SPIE 0083, Optical Information Processing: Real Time Devices & Novel Techniques, (12 January 1977); doi: 10.1117/12.954907; https://doi.org/10.1117/12.954907
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