Apparatus for stabilizing the scanning direction in an image fie

Details Apparatus for stabilizing the scanning direction in an image fie Apparatus for stabilizing the scanning direction in an image fie

1983-10-27

1986-06-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250578, 244 316, G01J 120

Patent

active

045945039

ABSTRACT:
In scanning an image field, for example an image field radiating infrared diation sensed by an infrared sensor, at least one, preferably two, electronically controlled scanners are used. The respective scanning directions extend perpendicularly relative to each other. Changes in these scanning directions are determined with the aid of a reference signal generator providing horizontal and vertical deviation signals with reference to a central or mean view direction. The central or mean view direction of at least one of the scanners, preferably of both scanners is then varied or corrected in a closed loop feedback circuit in response to the deviation signals so that the central or mean view direction is restored and maintained. Preferably, any horizontal or azimuth scanning deviation from the central or mean viewing direction is corrected by shifting the respective image points stored in a memory in a correction direction in response to the respective horizontal or azimuth deviation signal. The vertical or elevational scanning direction is corrected by correcting the drive signal for the vertical scanner in response to a respective vertical or elevational deviation signal.

REFERENCES:
patent: 4108400 (1978-08-01), Groutage et al.
patent: 4133004 (1979-06-01), Fitts
patent: 4224507 (1980-09-01), Gendreu
patent: 4439788 (1984-05-01), Frame
patent: 4500051 (1985-02-01), Cottle, Jr. et al.

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