Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-01-10
1979-12-04
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358166, 250333, H04N 533
Patent
active
041774833
ABSTRACT:
Process and arrangement for reconstituting the signal representing the thermal flux absorbed by a pyroelectric target, the arrangement being used in infrared camera tubes. It comprises means for correcting the signal Sn for reading a point of co-ordinates x, y of the target, during a frame of order n, comprising means for calculating a first component representing the Laplacian of the signal Sn and means for summating the signal Sn with the first component. The correcting means deliver a corrected signal. Means for generating a complementary signal are connected to the output of the calculating means and comprise means for generating a signal representing the temperature .theta..sub.n-1 of the point of co-ordinates x, y during the reading of that point in the course of a frame of order n-1 and a second component representing the Laplacian of that temperature. Means for summating the complementary signal with the corrected signal deliver the reconstituted signal.
REFERENCES:
patent: 3971886 (1976-07-01), Chow
patent: 4121248 (1978-10-01), Coale, Jr.
"Thomson-CSF"
Coles Edward L.
Griffin Robert L.
Plottel Roland
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