MODELLING ERRORS IN X-RAY FLUOROSCOPIC IMAGING SYSTEMS USING PHOTOGRAMMETRIC BUNDLE ADJUSTMENT WITH A DATA-DRIVEN SELF-CALIBRATION APPROACH - Chow, J. C. K.; Lichti, D. D.; Ang, K. D.; Al-Durgham, K.; Kuntze, G.; Sharma, G.; Ronsky, J. (Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., 2018)