Error Compensation by Sensor Re-calibration in Fringe Projection Based Optical 3D Stereo Scanners

A new methodology for the determination and correction of calibration errors in optical 3D scanners is introduced. The accuracy of optical 3D scanners is reduced when calibration parameters are no longer valid caused by e.g. changes of temperature or mechanic influences. Whereas complete new calibration of a system may be impossible or too expensive, a compensation of the parameter errors can lead to acceptable results. The new method is based on measurement of a simple grid pattern or arbitrary measuring objects. Results show that the method provides acceptable results concerning point correspondence and scaling error compensation. It takes low effort and is easy to handle.