Parameter extraction by holographic filtering.
Holographic matched filter pattern recognition has been plagued 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 four rotation angles from -15 to +15 degrees using three matched filters at -15, 0, and 15 degrees multiplexed onto a single hologram. This leads to obtaining a worst case accuracy (95% confidence) of 1.0 degrees 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.
Horner
J L
JL
Rome Air Development Center, Deputy for Electronic Technology, Hanscom Air Force Base, Massachusetts 01731, USA.
Caulfield
H J
HJ