Image analysis – Histogram processing – For setting a threshold
Patent
1988-05-31
1990-12-25
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 42, 350 382, 35016213, 250396R, G06K 900
Patent
active
049809229
ABSTRACT:
A system for calibrating the output correlation plane of an optical correlator for positional and nonlinearity information to determine the position of an input image in an input image plane of the optical correlator. The optical correlator operates on the principle of projecting the Fourier transform of an input image onto at least one matched filter having recorded thereon the Fourier transform hologram of an image of interest. The inverse Fourier transform of the correlated optical signal is then projected onto a detector to determine the correlation of the input image with the image of interest. A calibration image is positioned in the input image plane of the optical correlator, and includes a two dimensional array of substantially identical targets, with the precise location of each identical target in the input image plane being known. At least one matched filter is placed in the optical correlator, and has recorded thereon the Fourier transform hologram of the identical target. The positions of the resultant optical signals in the output correlation plane are then correlated with the position of the two dimensional array of identical targets in the input image plane to calibrate the output correlation plane of the optical correlator for positional information and nonlinearity. The calibration system of the present invention enables an optical correlator system to be precisely calibrated in a way that the system can continue to operate using the same optical computing array. The calibration system can be used with any prescribed input format, e.g. 35 mm, 70 mm, 5", etc.
REFERENCES:
patent: 4174179 (1979-11-01), Tschudi et al.
patent: 4371264 (1983-02-01), Lacombat et al.
patent: 4462046 (1984-07-01), Spight
patent: 4490849 (1984-12-01), Grumet et al.
patent: 4637056 (1987-01-01), Sherman et al.
patent: 4655542 (1987-04-01), Dube
patent: 4763004 (1988-08-01), Yasuda et al.
patent: 4772101 (1988-09-01), Liu
patent: 4809340 (1989-02-01), Mersereau
"Accurate Position Detection of Targets in Noise Image", Optics Communications vol. 54, No. 6, pp. 323-326, 1985.
"Robotic Vision, Tray-Picking System Design Using Multiple, Optical Matched Filters," SPIE vol. 638, Hybrid Image Processing (1986), pp. 2-8.
Investigation and Implementation of optical Memory for a Correlator Seeker Re-670, 1983, Grumman Research and Development Center Report.
Investigation of Large Capacity Optical Memories for Correlator Applications Re-634, 1981, Air Force Office of Scientific Research.
Aperture Tapering in a Coherent Optical Correlator, RM-976, 1984 Research and Development Center.
Boudreau Leo H.
Grumman Aerospace Corporation
Jung Yon
LandOfFree
System for output plane calibration of an optical correlator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for output plane calibration of an optical correlator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for output plane calibration of an optical correlator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1169223