Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-07-24
1992-07-28
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
250332, 250334, 358227, H04N 718
Patent
active
051344742
ABSTRACT:
In the method of the present invention for compensating scattered characteristics of infrared detector elements, a scene to be monitored is input through a focusing lens onto the infrared detector elements and the scene on the infrared detector elements is defocused or placed out of focus by adjusting the focusing lens. In addition, in the method a first signal level output from each detector element is then measured, the scene is focused, and a second signal level output from each detector element is compensated according to thus obtained measured signal having an average level. In the case where the scene is optically scanned on the linearly arranged detector elements, the first signal level may be averaged for a predetermined number of scans to obtain an average level of each detector element, and may be further averaged on a plurality of the scan directions slanted or rotated with respect to the scene. The scan direction is rotated by rotating a prism placed in the light path around the light path, to predetermined angular positions between 0 to 90 degrees so that the light input to the detector element is more properly averaged, to provide an improved average level. Temperature data of the central portion of the scene may be deleted omitted from the averaging operation because the central portion includes noises caused from a narcissus effect. In addition, temperature data is excluded because in the case where the scan directions are slanted by the prism rotation the central portion always detects the same object, the averaging of the scene is deteriorated.
REFERENCES:
patent: 4734583 (1988-03-01), Wang
patent: 4821337 (1989-04-01), Alm
patent: 4835606 (1989-05-01), Peck
Hanafusa Tsutomu
Shiraishi Kikuo
Britton Howard W.
Fujitsu Limited
LandOfFree
Method of compensating scattered characteristics of outputs of a does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of compensating scattered characteristics of outputs of a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of compensating scattered characteristics of outputs of a will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1690207