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可见光相机辅助的热红外相机几何定标

Geometric Calibration of Thermal Cameras Assisted by RGB Cameras
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摘要 为提升热红外相机的几何定位精度,针对热红外相机空间分辨率低、影像对比度差、边缘特征模糊等问题,提出了可见光相机辅助的热红外相机几何定标方法。在近景摄影测量环境下,设计了一种兼顾可见光相机与热红外相机的新型三维几何定标场,采用“先内定向、再外定向”的方法分步实现几何定标与应用测量。在倾斜航空摄影测量环境下,将几何定标与应用测量融为一体,在三维重建中考虑相机畸变对影像定位精度的影响,同时实现高精度的几何定标和三维重建。实验结果表明,该方法能大幅提升热红外相机的几何定标精度与稳定性,为高精度三维重建等应用提供支撑。 Due to the fact that thermal cameras suffer from the problems of low spatial resolution,bad image contrast and blurred image edge,we proposed a novel geometric calibration method of thermal cameras assisted by RGB cameras to improve the geometric positioning accuracy.In the close-range photogrammetry environment,we designed a new 3D geometric calibration field,which took RGB camera and thermal camera into consideration,and adopted interior orientation followed by exterior orientation to sequentially conduct geometric calibration and application measurement.In the oblique airborne photogrammetry environment,we integrated geometric calibration with application measurement,and considered the influence of camera distortion on image positioning accuracy during 3D reconstruction,which could achieve high-precision geometric calibration and 3D reconstruction at the same time.Experimental results show that the proposed method significantly improves the accuracy and robustness of thermal cameras,and provides supports for applications such as high-precision 3D reconstruction.
作者 林栋 杨保平 田鹏义 崔晓杰 祝若鑫 LIN Dong;YANG Baoping;TIAN Pengyi;CUI Xiaojie;ZHU Ruoxin(Space Engineering University,Beijing 102200,China;Beijing Institute of Remote Sensing Information,Beijing 100011,China;Xi’an Research Institute of Surveying and Mapping,Xi’an 710054,China)
出处 《地理空间信息》 2024年第3期7-10,15,共5页 Geospatial Information
基金 国家自然科学基金资助项目(62301606) 地理信息工程国家重点实验室基金资助项目(SKLGIE2019-Z-3-3)。
关键词 热红外相机 可见光相机 几何定标 近景摄影测量 倾斜航空摄影测量 thermal camera RGB camera geometric calibration close-range photogrammetry oblique airborne photogrammetry
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