| Citation: |
HUANG Wei, JIANG San, LIU Xianzheng, JIANG Wanshou. GNSS Constrained Self‑Calibration for Long Corridor UAV Image[J]. Geomatics and Information Science of Wuhan University, 2024, 49(2): 197-207. DOI: 10.13203/j.whugis20210436
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Camera self-calibration determines the precision of UAV (unmanned aerial vehicle) image AT (aerial triangulation). The UAV images collected from long transmission line corridors are critical configurations, which may lead to the “bowl effect” with camera self-calibration. To solve such problems, traditional methods rely on more than three GCPs (ground control points), while this study designs a new self-calibration method with only one GCP.
First, two categories camera distortion models, i.e., physical and mathematical model, are studies in details. Second, within an incremental SfM (structure from motion) framework, a camera self-calibration method is designed, which combines the strategies for initializing camera distortion parameters and fusing high-precision GNSS (global navigation satellite system) observations.
The proposed algorithm is verified by using four UAV datasets collected from two sites based on two data acquisition modes. The experimental results show that the proposed method can dramatically alleviate the “bowl effect” and improve the accuracy of AT, and the horizontal and vertical accuracies reach 0.06 m, respectively, when using one GCP.
compared with open-source and commercial software, the proposed method achieves competitive or better performance.
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