1400×900壁纸13张纯色,自然,护眼-课件（PPT·精·选）.ppt

CALIBRATION EVALUATION AND CALIBRATION STABILITY MONITORING OF FRINGE PROJECTION BASED 3D SCANNERS C. Br?uer-Burchardt, A. Breitbarth, C. Munkelt, M. Heinze, P. Kühmstedt, G. Notni Fraunhofer IOF Jena, Albert-Einstein-Str. 7, D-07745 Jena, Germany -******@ Commission III, WG III/1 KEY WORDS: Fringe Projection, Calibration Evaluation, Epipolar Geometry, Optical 3D Measurement ABSTRACT: In this work a simple new method for calibration evaluation and calibration stability monitoring offringe projection based 3D scannersis introduced. This method is based on high precision point correspondence finding of fringe projection sensors using phase values in two perpendicular directions and epipolar geometry concerning calibration data of stereo sensors. The calibration evaluation method can be applied in the measurement process and does not require any additional effort or equipment. It allows the evaluation of the current set of calibration parameters and consideration ofthe stability of the current calibration over certain temporal , the quality of distortion correction can be scored. The behavior of three fringe projection based 3D stereo scannertypes was analyzed by experimental of the different types of scanners show that calibration may be stable over a long time period. On the other hand, suddenly occurringdisturbances may be detectedwell. Additionally, the calibration error usually showsa significant drift in the warm-up phase untilthe operating temperature isachieved. Contactless scanning of the surface of different measuring objects is increasingly required in industry and technique, scientific research, cultural heritage preservation and documentation, and in medicine. Fringe projection is the basic principle of a family of such 3D scanners. Flexibility, measuring accuracy, me