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Nonlinear local image preprocessing using coherent optical techniques

opg.optica.org · 103 words · saved by 1 readers

The authors are with Carnegie-Mellon University, Department of Electrical Engineering, Pittsburgh, Pennsylvania 15213. USA Jiabi Chen is a visiting scholar from Huazhong Institute of Technology, Wuhan, China. Full-text access provided by University of Toronto Two coherent optical systems are described that can realize local nonlinear preprocessing operators such as the Sobel edge-enhancement function in parallel on a 2-D input image. By local, we refer to the size of the image region rather than a nonstationary process. Realization of such operators using a multiple-exposure matched spatial filter and a computer-generated hologram is discussed. Experimental results using these techniques for 3 × 3 and 5 × 5 Sobel operators, respectively, are presented. Our techniques can be extended to larger window sizes and other edge-enhancement operators. These new operators are achieved by novel coherent systems using complex arithmetic with magnitude evaluation of the output pattern. © 1983 Opti

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