Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1989-02-17
1990-12-25
Jordan, Charles T.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 2, 434 4, G01C 300, G01C 1112, G09D 900
Patent
active
049798154
ABSTRACT:
A range imaging system, and a method for calibrating such a system are based on the principles of projective geometry. The system comprises four subsystems: (1) a laser and a cylindrical lens or vibrating mirror for producing a planar beam of light; (2) an electronic camera equipped with a lens and an appropriate interference filter; (3) an electronic circuit for height (depth) measurements and video image generation; and (4) a scanning mechanism for moving the object with respect to the light beam and the camera so as to scan an area of the object surface. The system is calibrated by determining the position in the electronic image of the object surface at three different heights. The range image is generated from these three known heights from either a previously determined look-up table, or from a calculation based on the invariance of the cross-ratio, a well known ratio from projective geometry.
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Jordan Charles T.
Lieberman Rochelle
Milde Jr. Karl F.
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