Scanning photoelectric autocollimator
Optical surface topography mapping system
Non-contact digital contour generator
ApplicationNo. 312635 filed on 02/17/1989
US Classes:356/3.06, With a single photodetector having multiple elements356/2, CONTOUR PLOTTING434/4Optical means (e.g., image projector, etc.) or light or sound sensor (e.g., television camera, microphone, etc.) included in a simulator
ExaminersPrimary: Jordan, Charles T.
Assistant: Lieberman, Rochelle
Attorney, Agent or Firm
International ClassesG01C 003/00
AbstractA 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.