A Comparison of Three Geometric Self-Calibration Methods for Range Cameras

Remote Sensing

Derek D. Lichti¹ 

[1] Department of Geomatics Engineering, The University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada

关键词: range camera;    geometric self-calibration;    error modeling;    correlation;   

DOI  :  10.3390/rs3051014

来源: mdpi

【 摘 要 】

Significant instrumental systematic errors are known to exist in data captured with range cameras using lock-in pixel technology. Because they are independent of the imaged object scene structure, these errors can be rigorously estimated in a self-calibrating bundle adjustment procedure. This paper presents a review and a quantitative comparison of three methods for range camera self-calibration in order to determine which, if any, is superior. Two different SwissRanger range cameras have been calibrated using each method. Though differences of up to 2 mm (in object space) in both the observation precision and accuracy measures exist between the methods, they are of little practical consequence when compared to the magnitude of these measures (12 mm to 18 mm). One of the methods was found to underestimate the principal distance but overestimate the rangefinder offset in comparison to the other two methods whose estimates agreed more closely. Strong correlations among the rangefinder offset, periodic error terms and the camera position co-ordinates are indentified and their cause explained in terms of network geometry and observation range.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.