Semi-automatic metric reconstruction of buildings fromself-calibration: preliminary results on the evaluation of a linearcamera self-calibration method

摘要

We investigate the linear self-calibration method proposed byNewsam et al. (1996) for our project on 3D reconstruction ofarchitectural buildings. This self-calibration method assumes that theprincipal point is known, the camera has square pixels and has no skew.It allows 3D shape to be reconstructed from two images while giving thecamera the freedom to vary its focal length. In this paper, we evaluatethe focal lengths obtained from their method with both synthetic dataand real data. In real data where known 3D data are available, Tsai's(1987) calibration method is used for comparison. Our experimentalresults show that the focal lengths from the two methods differed byless than 5% and the reconstructed 3D shape was very good in that angleswere well preserved