A Sequential Aerial Triangulation Algorithm for Real-time Georeferencing of Image Sequences Acquired by an Airborne Multi-Sensor System
A Sequential Aerial Triangulation Algorithm for Real-time Georeferencing of Image Sequences Acquired by an Airborne Multi-Sensor System
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DOI：
10.3390/rs5010057
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发表时间：
2012-12
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影响因子：
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通讯作者：
Kyoungah Choi;Impyeong Lee
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文献类型：
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作者：
Kyoungah Choi;Impyeong Lee
实时图像地理配准是从机载多传感器系统采集的图像序列中快速生成正射图像等空间信息的关键。它主要基于使用GPS/INS系统的直接地理参考，但其精度受到GPS/INS数据质量的限制。使用传统的空中三角测量(AT)结合GPS/INS数据可以获得更精确的结果，但由于计算要求很高，只能作为后处理方法进行。在这项研究中，我们提出了一种连续的AT算法，它可以实时地产生与同时AT算法相当的准确结果。每当添加新的图像时，该算法在当前阶段利用前一阶段的计算结果以最小的计算量快速地执行AT。实验结果表明，在任意阶段对图像序列进行地理参考所花费的时间小于0.1S，其精度在估计的地面点上小于±5 cm，与同步AT的结果相当。该算法可用于需要实时图像地理配准的应用，如灾害监测和基于图像的导航。
Real-time image georeferencing is essential to the prompt generation of spatial information such as orthoimages from the image sequence acquired by an airborne multi-sensor system. It is mostly based on direct georeferencing using a GPS/INS system, but its accuracy is limited by the quality of the GPS/INS data. More accurate results can be acquired using traditional aerial triangulation (AT) combined with GPS/INS data, which can be performed only as a post-processing method due to intense computational requirements. In this study, we propose a sequential AT algorithm that can produce accurate results comparable to those from the simultaneous AT algorithm in real time. Whenever a new image is added, the proposed algorithm rapidly performs AT with minimal computation at the current stage using the computational results from the previous stage. The experimental results show that the georeferencing of an image sequence at any stage took less than 0.1 s and its accuracy was determined within ± 5 cm on the estimated ground points, which is comparable to the results of simultaneous AT. This algorithm may be used for applications requiring real-time image georeferencing such as disaster monitoring and image-based navigation.