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首页> 外文期刊>Marine ecology progress series >Affordable and accurate stereo-video system for measuring dimensions underwater: a case study using oceanic whitetip sharks Carcharhinus longimanus
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Affordable and accurate stereo-video system for measuring dimensions underwater: a case study using oceanic whitetip sharks Carcharhinus longimanus

机译：经济实惠且精确的立体视频系统，可用于测量水下尺寸：使用海洋白鳍鲨Carcharhinus longimanus的案例研究

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Non-intrusive and non-destructive acquisition of length measurements for marine megafauna is increasingly valuable given growing threats to many species' long-term survival. Stereo videography provides a means of obtaining length data with minimal impact on the organism and minimal observer bias. However, for many researchers, there are still significant financial barriers to employing stereo videography. Small-action cameras have reduced costs, but camera calibration still requires significant investment in software and equipment. Here, we trial open source calibration procedures using the R package StereoMorph and a simple 2D checkerboard as a calibration object to test if this approach yields accurate length data. We used a stereo-video system comprising 2 GoPro (TM) cameras to estimate the lengths of known targets in a pool and the lengths of oceanic whitetip sharks Carcharhinus longimanus in situ. Sharks were restrained in water alongside a boat and measured with a tape measure for comparison with the stereo-video lengths. Both pool and field trials yielded accurate results comparable to previous studies using 3D calibration cubes. Stereo-video measurements of lengths > 1 m had proportional errors of < 1% in the pool and < 3.0% (64.2 mm) in comparison with tape-measured lengths of sharks in the field. Our open source calibration methods and affordable GoPro (TM)-based stereo-video system yielded measurements that are comparable to other systems that use 3D calibration techniques and more expensive cameras. Additionally, we improve on previous attempts of 2D calibration approaches.
机译：鉴于对许多物种长期生存的威胁越来越大，对海洋大型动物进行长度测量的非侵入式和非破坏性采集越来越有价值。立体摄影术提供了一种获取长度数据的方法，该数据对有机体的影响最小，观察者的偏差也最小。但是，对于许多研究人员而言，使用立体影像摄影仍然存在重大的财务障碍。小型相机降低了成本，但相机校准仍需要在软件和设备上进行大量投资。在这里，我们尝试使用R包StereoMorph和简单的2D棋盘格作为校准对象来测试开源校准程序，以测试这种方法是否产生准确的长度数据。我们使用了包括2个GoPro（TM）摄像机的立体视频系统来估计池中已知目标的长度和原位海洋白鳍鲨Carcharhinus longimanus的长度。鲨鱼被束缚在小船旁边的水中，并用卷尺测量，以与立体声视频长度进行比较。合并试验和现场试验均获得了与以前使用3D校准立方体进行的研究相当的准确结果。与实地卷尺测量的鲨鱼长度相比，长度> 1 m的立体声视频测量在池中的比例误差为<1％，在鲨鱼中的比例误差为<3.0％（64.2 mm）。我们的开源校准方法和价格合理的基于GoPro（TM）的立体声视频系统所产生的测量结果可与使用3D校准技术和更昂贵的相机的其他系统相媲美。此外，我们改进了先前的2D校准方法尝试。

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