Camera Calibration for Water-Biota Research: The Projected Area of Vegetation.
Camera Calibration for Water-Biota Research: The Projected Area of Vegetation.
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DOI：
10.3390/s151229798
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发表时间：
2015-12-03
期刊：
影响因子：
--
通讯作者：
Shiono K
中科院分区：
文献类型：
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作者：
Wackrow R;Ferreira E;Chandler J;Shiono K
成像系统在揭示不同水流条件下的植被姿态方面具有无可争议的作用，图像序列是由现成的数字相机生成的。这种传感器价格便宜，但引入了一系列失真效应，这一特性在侧重于水-植被依赖性的水力研究中仅得到少量处理。本文旨在通过提出一种简单的校准方法来消除摄像机透镜畸变和水的折射效应来弥补这一差距。该方法的有效性说明使用可变的投影面积，计算简单和复杂形状的物体。结果表明，在确定投影面积和进一步的数据分析之前，使用组合的透镜畸变和折射模型校正图像的意义。使用这种技术，预计将增加数据的可靠性，为今后的工作植被渠道。
Imaging systems have an indisputable role in revealing vegetation posture under diverse flow conditions, image sequences being generated with off the shelf digital cameras. Such sensors are cheap but introduce a range of distortion effects, a trait only marginally tackled in hydraulic studies focusing on water-vegetation dependencies. This paper aims to bridge this gap by presenting a simple calibration method to remove both camera lens distortion and refractive effects of water. The effectiveness of the method is illustrated using the variable projected area, computed for both simple and complex shaped objects. Results demonstrate the significance of correcting images using a combined lens distortion and refraction model, prior to determining projected areas and further data analysis. Use of this technique is expected to increase data reliability for future work on vegetated channels.