Zoom lens calibration with zoom- and focus-related intrinsic parameters applied to bundle adjustment

A Flexible, Generic Photogrammetric Approach to Zoom Lens Calibration

“…The new approach presented herein is more generally applicable than that of Zheng et al [16] and the achieved accuracy using EXIF is significantly higher than the relative accuracy of less than 1:1000 that was previously reported. This manuscript explains the new developments and analyzes the reasons for the improved performance over Zheng et al [16]. Moreover, a successful application of the approach is presented whereby the calibrated zoom lens camera is used to render a point cloud of a building façade, thereby demonstrating the feasibility and applicability of the proposed method.…”

“…Photogrammetric accuracies achieved through both mono-focal and multi-focal triangulations were evaluated after calibration. The relative accuracies for mono-focal triangulations ranged from 1: 6300 to 1: 18,400 for the two cameras studied, whereas the multi-focal triangulation accuracies ranged from 1: 11,300 to 1: 16,200. In order to demonstrate the applicability of the approach, calibrated zoom lens imagery was used to render a laser-scanned point cloud of a building façade.…”

“…Among these methods, the self-calibrating bundle adjustment [4,12,13] is widely considered to achieve superior accuracy [8] and has been extensively adopted by the photogrammetry community. However, the intrinsic parameters of a zoom lens camera change dramatically with zooming and focusing operations [14][15][16] and the camera model for a prime lens therefore cannot simply be transferred and applied directly to a zoom lens. Under such a scenario this study proposes an enhanced method, developed further to research previously reported in Zheng et al [16], which aims to develop a suitable zoom lens camera model for photogrammetry.…”

“…However, the intrinsic parameters of a zoom lens camera change dramatically with zooming and focusing operations [14][15][16] and the camera model for a prime lens therefore cannot simply be transferred and applied directly to a zoom lens. Under such a scenario this study proposes an enhanced method, developed further to research previously reported in Zheng et al [16], which aims to develop a suitable zoom lens camera model for photogrammetry. The new approach presented herein is more generally applicable than that of Zheng et al [16] and the achieved accuracy using EXIF is significantly higher than the relative accuracy of less than 1:1000 that was previously reported.…”

“…Under such a scenario this study proposes an enhanced method, developed further to research previously reported in Zheng et al [16], which aims to develop a suitable zoom lens camera model for photogrammetry. The new approach presented herein is more generally applicable than that of Zheng et al [16] and the achieved accuracy using EXIF is significantly higher than the relative accuracy of less than 1:1000 that was previously reported. This manuscript explains the new developments and analyzes the reasons for the improved performance over Zheng et al [16].…”