Two coherent optical systems are described that can realize local 3 × 3 preprocessing operators such as the Sobel edge-enhancement function in parallel on a 2-D input image. Realization using a multiple exposure matched spatial filter and a computer-generated hologram are discussed and experimental results using both techniques are presented. The basic technique can be directly extended to allow realization of most nonlinear local preprocessing operators.
Topics
Holography
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© 1982 Laser Institute of America.
1982
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