Simplified calibration for a distance information obtaining devi

Details Simplified calibration for a distance information obtaining devi Simplified calibration for a distance information obtaining devi

1988-08-08

1989-09-05

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

356 4, 364561, H04N 718

Patent

active

048643955

ABSTRACT:
In a distance information obtaining device comprising an image pickup device (10) for picking up an optical image of an object to produce a picture signal, and a signal processing unit (18) for processing the picture signal to produce a processed signal representative of distance information between the image pickup device and each point of the object, the signal processing unit produces a reference signal by using a reference picture signal derived from the image pickup device on a preliminary process. Responsive to the reference signal, a preliminary processing unit (26) preliminarily processes the reference signal to produce a preliminary processed signal as a calibration signal. In a measuring process, the signal processing unit processes the picture signal with reference to the preliminary processed signal. Preferably, the reference picture signal should be given in the form of first and second reference picture signals derived from first and second reference optical images of first and second reference plates (16) and (16') located at first and second distances (Z.sub.a) and (Z.sub.b) from the image pickup device.

REFERENCES:
patent: 4601053 (1986-07-01), Grumet
patent: 4746790 (1988-05-01), Sorimachi
patent: 4761546 (1988-08-01), Ikari
patent: 4786815 (1988-11-01), Walker
Tajima, "Rainbow Range Finder Principle for Range Data Acquisition", International Workshop on Industrial Application of Machine Vision and Machine Intelligence, pp. 381-386, held by IEEE 1987.

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