非量测相机制约迭代检校法及水下测量应用

传统的非量测相机检校方法大多依赖于高精度的室内或室外控制场,并对检校环境有较严格的要求。故提出了一种完全抛开控制点的新的相机检校方法,即线面角制约的相机迭代检校法。将该方法分别应用于陆地和水下环境,并与有控制点的相机迭代检校法进行对比分析,试验结果表明新方法的检校精度均小于1个像素,在陆地环境下,新方法的检校精度优于有控制点的相机迭代检校法。同时利用新方法进行了水下三维重建和量测,量测精度达到亚毫米级。试验结果表明新方法具有较好的灵活性和适应性,在多个环境下具有实际应用的价值。

A Method of Camera Constraint Iterative Calibration and its Underwater Meansurement Applications

Most camera calibration methods rely on highly accurate control points and well-controlled imaging environments (the control-point method). In this paper, a new calibration method (line-plane-angle constrained iterative calibration method) is proposed. Experiments (including land and underwater environments) are designed to compare the proposed method to the control-point method. The experimental results show that sub-pixel calibration accuracy can be achieved using the new method, and the new method is superior to the control-point method in the terrestrial environment. Finally, the new method is applied during a underwater 3D reconstruction and measurement application, and the results indicate that sub-millimeter measurement accuracy can be reached when a non-metric camera is used. Given that the new method has the advantages of flexibility and adaptability, it is believed that it has potentials in many practical applications.