Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1992-10-15
1994-08-16
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
G01B 1124
Patent
active
053391543
ABSTRACT:
The invention relates to a method for optical measurement of objects, in particular teeth, with a projector, with beam path diverging from a projector central point, imaging on the object a pattern of different ranges of brightness, which pattern is imaged on the sensor surface of a camera, arranged in a certain disposition in space at a parallax angle to the projector, with a beam path converging in the direction of a camera central point, and is split up into image points, the light intensities of which are measured and stored, and from the light intensities of the image points the phase position of the latter is determined and stored. For the purpose of error-free measurement it is proposed that the position in space of the projector central point, of the camera central point and also of sensor elements of the sensor surface be calculated and stored, the pattern in the plane of projection be split up into image points, the position in space of the latter be calculated and stored, image points of equal phase position be correlated with each other and the position in space of straight lines through image points of equal phase position and the projector and camera central point and also the space coordinates of the points of intersection of these straight lines be calculated. The storage, correlation and calculation occur in a computer.
REFERENCES:
patent: 4648717 (1987-03-01), Ross et al.
patent: 4668094 (1987-05-01), Matsumoto et al.
patent: 4802759 (1989-02-01), Matsumoto et al.
patent: 5175601 (1992-12-01), Fitts
Gassler Joachim
Massen Robert
Evans F. L.
Kaltenbach & Voigt Gmb & Co.
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