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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 22, Iss. 6 — Mar. 15, 1983
  • pp: 808–814

Nonlinear local image preprocessing using coherent optical techniques

David Casasent and Jiabi Chen  »View Author Affiliations


Applied Optics, Vol. 22, Issue 6, pp. 808-814 (1983)
http://dx.doi.org/10.1364/AO.22.000808


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Abstract

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 Optical Society of America

History
Original Manuscript: September 22, 1982
Published: March 15, 1983

Citation
David Casasent and Jiabi Chen, "Nonlinear local image preprocessing using coherent optical techniques," Appl. Opt. 22, 808-814 (1983)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-22-6-808


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