非量测相机制约迭代检校法及水下测量应用

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

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。

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 controlpoint 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.