Abstract
Vision-based inspection techniques have improved the efficiency of tunnel inspection. This paper presents a rail transit tunnel multi-line-scan camera inspection system that requires global calibration to obtain the spatial relationships among all line-scan cameras, which is crucial for tunnel panoramic image mosaicking and 3D reconstruction. A flexible global calibration method is proposed, a hybrid calibration target is designed that includes triangular patterns based on the cross-ratio(CR) invariance principle and target holes. Establishing a virtual target field and using coplanarity as a constraint to refit a new view plane and globally optimizing the initial coordinates, which would ensure the calibration accuracy. In addition, an accuracy evaluation method based on CR triangles is proposed to assess the calibration results. The experimental results demonstrate the feasibility and reliability of the proposed calibration method and that the developed accuracy evaluation method is feasible compared with the traditional reprojection error method.
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