STRUCTURED-LIGHTING SURFACE SENSOR AND ITS CALIBRATION

A new kind of structured-lighting surface sensor based on computer vis ion is presented. The sensor can be used to complete dimensional measu rements in an industrial environment with the help of smart calibratio n processes and image algorithms. The mathematical model and calibrati on techniques for the sensor are described in detail. In the local cal ibration, termed the differential method, structured parameters and th e local coordinate system of the sensor are determined. Subsequently, a global calibration process is introduced briefly, As an application, a sample vision inspection system is built for checking dimensions on the left sideframe of a body-in-white (BIW). An automotive BIW is an assembled body before insertion of door, windshield, hood, decklid, an d fender.