Image analysis – Image enhancement or restoration – Artifact removal or suppression
Patent
1995-08-16
1998-09-08
Couso, Yon
Image analysis
Image enhancement or restoration
Artifact removal or suppression
382103, 2502036, G06K 940, G06K 900
Patent
active
058057420
ABSTRACT:
A minimum-spanning gradient filter used to suppress clutter in a target detection and tracking system. The minimum-spanning gradient filter uses subspace projection clutter suppression techniques, but does not require eigenanalysis. Model frames of data from a sensor array are stored in a memory in which the model frames do not include targets that are being detected. At start-up, a Gram-Schmidt system generates a series of unit vectors that define a clutter subspace where most of the clutter in the model frames will reside. Current frames of data from the sensor array and unit vectors from the Gram-Schmidt system are applied to a subspace projection system that removes the clutter subspace from the current frames of data. Once the original clutter subspace has been generated, a plane smoothing system updates the clutter subspace as new frames of data are added to the model frames. Current frames of data sent to the subspace projection system are centered. Additionally, a standard deviation for the pixel intensities in each frame of data is applied to a standard deviation threshold to prevent pixels that fall below the threshold from being updated in the clutter subspace. A glint threshold detector is provided to eliminate pixels above a predetermined glint threshold so that they do not contribute to the updated clutter subspace.
REFERENCES:
patent: 3638025 (1972-01-01), Dishington et al.
patent: 4739401 (1988-04-01), Sacks et al.
patent: 4937878 (1990-06-01), Lo et al.
patent: 5061934 (1991-10-01), Brown et al.
patent: 5150426 (1992-09-01), Banh et al.
patent: 5185526 (1993-02-01), Reitman et al.
patent: 5245677 (1993-09-01), Lepore et al.
patent: 5257121 (1993-10-01), Steinberg
patent: 5267329 (1993-11-01), Ulich et al.
patent: 5280289 (1994-01-01), Root
patent: 5291563 (1994-03-01), Maeda
patent: 5300780 (1994-04-01), Denney et al.
patent: 5341439 (1994-08-01), Hsu
patent: 5371542 (1994-12-01), Pauli et al.
patent: 5386480 (1995-01-01), Lo et al.
patent: 5394520 (1995-02-01), Hall
patent: 5430445 (1995-07-01), Peregrim et al.
patent: 5491487 (1996-02-01), Gerlach
patent: 5495257 (1996-02-01), Loomis
patent: 5497435 (1996-03-01), Berger
patent: 5546084 (1996-08-01), Hindman
Hulsmann, J.D. and Barry, P.E., "An Eigenvector Procedure for Eliminating Line-of-Sight Jitter Induced Noise from Staring Mosaic Sensors", 19th Annual Asilomar Conference on Circuits, Systems and Computers, Pacific Grove, CA, Nov. 6-8, 1985.
Couso Yon
Patel Jayanti K.
TRW Inc.
Yatsko Michael S.
LandOfFree
Object detection system with minimum-spanning gradient filter fo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Object detection system with minimum-spanning gradient filter fo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Object detection system with minimum-spanning gradient filter fo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1291841