Parameter Extraction By Holographic Filtering

J. L. Horner; H. J. Caulfield

doi:10.1117/12.932805

7 December 1981 Parameter Extraction By Holographic Filtering

J. L. Horner, H. J. Caulfield

Proceedings Volume 0292, Processing of Images and Data from Optical Sensors; (1981) https://doi.org/10.1117/12.932805
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

Abstract

Holographic pattern recognition has been plague by too much sensitivity to such parameters as rotation and scale. We show here how to use that sensitivity to make rapid, accurate estimations of those parameters. For the particular case studied, we made signal-magnitude independent measurements of three rotation angles from -15° to +15° using three matched filters at -15°, 0°, and 15° multiplexed onto a single hologram. This lead to obtain a worst-case accuracy (standard deviation) of 1.0° for intermediate angles. The composite filter allows a search to be made electronically in the output plane, thus avoiding any moving parts, i.e., object or matched filter.

Citation Download Citation

J. L. Horner and H. J. Caulfield "Parameter Extraction By Holographic Filtering", Proc. SPIE 0292, Processing of Images and Data from Optical Sensors, (7 December 1981); https://doi.org/10.1117/12.932805

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