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Proceedings Paper

Optical contour enhancement using a modified gradient filter
Author(s): K. Yao; Pascal Galerne; J. Michel; B. Fracasso
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Paper Abstract

Although considered as low level processing, edge detection is a crucial step in object and image recognition. Such an operation can be implemented in real time by use of an appropriate transmittance in the Fourier plane of a so-called VanderLugt optical correlator. The performance of this scheme depends on both the contour enhancement operator chosen and the spatial filter design. For the latter point, great flexibility can be obtained by using computer generated holography techniques. In this framework, we propose to implement a particular contour extraction primitive, namely the summation of the partial derivatives of an input function, using a direct binary search (DBS) procedure for the design of the spatial filter. This first approach leads, however, to a non-detection of the contours oriented at 45 degrees to the abcissa axis. To solve this problem we propose a modified gradient holographic filter. A theoretical analysis and simulation results are presented.

Paper Details

Date Published: 15 September 1995
PDF: 9 pages
Proc. SPIE 2540, Current Developments in Optical Design and Engineering V, (15 September 1995); doi: 10.1117/12.219515
Show Author Affiliations
K. Yao, GTS Ecole Navale (France)
Pascal Galerne, GTS Ecole Navale (France)
J. Michel, GTS Ecole Navale (France)
B. Fracasso, URA/CNRS (France)

Published in SPIE Proceedings Vol. 2540:
Current Developments in Optical Design and Engineering V
Robert E. Fischer; Warren J. Smith, Editor(s)

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