Virginia TechCao, D. Q.Banerjee, P. P.Poon, Ting-Chung2014-04-042014-04-041998-02-01Dongqing Cao, Partha P. Banerjee, and Ting-Chung Poon, "Image Edge Enhancement with Two Cascaded Acousto-Optic Cells with Contrapropagating Sound," Appl. Opt. 37, 3007-3014 (1998). doi: 10.1364/ao.37.0030070003-6935http://hdl.handle.net/10919/46914Basic real-time programmable image-processing operations are accomplished by use of acousto-optic (AO) cells. Instead of frequency-plane filters, the AO cells are placed directly behind the object. The one-dimensional edge-enhancement results with one AO cell can be improved by use of two AO cells that are placed in tandem with contrapropagating sound. The dominant second-derivative operation obtained from the transfer function of the undiffracted order works like a one-dimensional Laplacian operator that enables improved edge enhancement. (C) 1998 Optical Society of America.application/pdfenIn CopyrightBragg-diffractionArticle - Refereedhttp://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-14-3007https://doi.org/10.1364/ao.37.003007