23 March 1998 Pre-detector processing of three-dimensional incoherent image fields
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Abstract
This paper describes a method to modify the point spread characteristics of an imaging system to perform convolution filtering of incoherent image fields prior to detection. The technique utilizes an aperture plane phase only optical element (kinoform) which is computer generated to optimize efficiency and is fabricated as a bleached hologram. In addition to providing a high speed alternative to digital enhancement of images, optical processing using this approach has several interesting properties. The most significant of these is the ability of the phase element to retain and process high spatial frequency image information from parts of the image which would otherwise be out of focus. As a result this technique allows an optical implementation of three- dimensional convolution filtering, a practical demonstration of which is given in this paper.
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Robin D. Alcock, Robin D. Alcock, Neil A. Halliwell, Neil A. Halliwell, Jeremy M. Coupland, Jeremy M. Coupland, Phillip Sutton, Phillip Sutton, John Savage, John Savage, "Pre-detector processing of three-dimensional incoherent image fields", Proc. SPIE 3386, Optical Pattern Recognition IX, (23 March 1998); doi: 10.1117/12.304753; https://doi.org/10.1117/12.304753
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