Zhang Gaopeng, Zhao Hong, Yang Hongtao, Hong Yang, Ma Yueyang, Gu Feifei
Appl Opt. 2019 Feb 20;58(6):1467-1474. doi: 10.1364/AO.58.001467.
For the on-orbit space zoom camera, the camera focal length is in a constant process of change; accordingly, compared with calibrating other camera intrinsic parameters, calibrating the focal length has a practical significance for the space zoom camera. With the vanishing points obtained from the solar panel of human-made space satellites, this paper introduces a focal length self-calibration method for the on-orbit space zoom camera. First, the geometrical relationship and infinite homography of vanishing points at various camera positions are used to derive the method. To improve the accuracy and robustness performance of this approach, an optimization method is then proposed to nonlinearly optimize the camera focal length. Finally, simulation and real physical experiments demonstrate that the proposed method is flexible and accurate with good anti-noise interference and real-time capacity. The method proposed in this paper makes more realistic sense for a number of important space tasks.
对于在轨空间变焦相机，相机焦距处于不断变化的过程中；因此，与校准其他相机内参相比，校准焦距对空间变焦相机具有实际意义。利用人造卫星太阳能板获得的灭点，本文介绍了一种在轨空间变焦相机的焦距自校准方法。首先，利用不同相机位置灭点的几何关系和无穷单应性来推导该方法。为提高该方法的精度和鲁棒性，随后提出一种优化方法对相机焦距进行非线性优化。最后，仿真和实际物理实验表明，所提方法灵活、准确，具有良好的抗噪声干扰能力和实时性。本文提出的方法对一些重要的空间任务具有更现实的意义。
