Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1995-04-14
1995-12-12
Williams, Hezron E.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
348169, 348148, 348135, 340937, G01C 2500
Patent
active
054739314
ABSTRACT:
A calibration apparatus for calibrating three-dimensional space for a machine vision system and a method for using the calibration apparatus for calibrating the machine vision system are disclosed. The calibration apparatus comprises pairs of indicators, such as lights, mounted on a frame, each pair of lights separated by a known horizontal distance. The calibration apparatus may be mounted on the back of a vehicle that moves the apparatus through a roadway scene at a known speed. A machine vision system tracks the calibration apparatus, specifically the pairs of lights mounted on the frame, and maps the pixel space of the machine vision system to three-dimensional space.
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Brady Mark J.
Cerny Darin G.
Rodriguez Alex
Griswold Gary L.
Kirn Walter N.
Larkin Daniel S.
Minnesota Mining and Manufacturing Company
Ouyang Michael K.
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