Abstract
The application of light-weight cameras in UAV photogrammetry is required due to restrictions in payload. In general, consumer cameras with normal lens type are applied to a UAV system. The availability of action cameras, like the GoPro Hero4 Black, including a wide-angle lens (fish-eye lens) offers new perspectives in UAV projects. With these investigations, different calibration procedures for fish-eye lenses are evaluated in order to quantify their accuracy potential in UAV photogrammetry. Herewith the GoPro Hero4 is evaluated using different acquisition modes. It is investigated to which extent the standard calibration approaches in OpenCV or Agisoft PhotoScan/Lens can be applied to the evaluation processes in UAV photogrammetry. Therefore different calibration setups and processing procedures are assessed and discussed. Additionally a pre-correction of the initial distortion by GoPro Studio and its application to the photogrammetric purposes will be evaluated. An experimental setup with a set of control points and a prospective flight scenario is chosen to evaluate the processing results using Agisoft PhotoScan. Herewith it is analysed to which extent a pre-calibration and pre-correction of a GoPro Hero4 will reinforce the reliability and accuracy of a flight scenario.
Highlights
The availability of action cameras and their easy-to-use capabilities are of high interest for UAV photogrammetry
In HD mode the results show high differences especially between the approaches in photogrammetry and computer vision
Different calibration procedures and processing steps are used in order to provide comprehensive information on the behavior of the camera with an ultra-wide FOV
Summary
The availability of action cameras and their easy-to-use capabilities are of high interest for UAV photogrammetry. Due to their light weight, their robustness, their high resolution in video and still-image capture and their wide field of view, action cameras provide different advantages for photogrammetric purposes, especially in UAV photogrammetry. The wide field of view caused by a fish-eye lens yields some difficulties in camera calibration. Typical fish-eye lenses are characterized by a short principal distance and a high radialsymmetric lens distortion. As on-the-job camera calibration in UAV photogrammetry using standard consumer cameras is of low quality due to the flight characteristics, the estimation of the interior orientation parameters of action cameras with wideangle lenses is expected to be even more unreliable. A precalibration is recommended in order to provide best interior orientation parameters and to allow for precise photogrammetric reconstructions
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