Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-12-05
1978-11-07
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
250203CT, 350110, H04N 718
Patent
active
041248651
ABSTRACT:
A reticle superimposed upon an observation scene is detected by electronically discriminating the reticle from the rest of the observation scene to thereby define a coordinate system. The reticle is identified in an observation scene by recognizing that all reticle signal return elements fall on a straight line, that each reticle return will have a substantially uniform amplitude or pulse height, and that each reticle will have a predetermined predictable line thickness or pulse width. The discriminating system and method utilized first gates the video to detect returns within only selected portions of the observation scene. The "blackest" level within each video gate is then determined and a reference level close to it is established. All signals below the reference level are then purged. Finally, the pulse width of each resultant signal and its associated location within each sensor sweep is determined and tested for correlation with the resultant signals of a plurality of sequential sensor sweeps. Azimuth and elevation reticle locations are defined when such correlation exists.
REFERENCES:
patent: 3175089 (1965-03-01), Talley
patent: 3699380 (1972-10-01), Alpers
patent: 3725576 (1973-04-01), Crawford
patent: 3988534 (1976-10-01), Sacks
Britton Howard W.
Hughes Aircraft Company
Link, Jr. Lawrence V.
MacAllister W. H.
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