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Open AccessArticle

Camera Calibration for Water-Biota Research: The Projected Area of Vegetation

School of Civil and Building Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
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Author to whom correspondence should be addressed.
Academic Editor: Fabio Menna
Sensors 2015, 15(12), 30261-30269; https://doi.org/10.3390/s151229798
Received: 8 October 2015 / Revised: 27 November 2015 / Accepted: 30 November 2015 / Published: 3 December 2015
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. View Full-Text
Keywords: photogrammetry; underwater imaging; eco-hydraulics; flow visualization and imaging; laboratory studies; plants reconfiguration; vegetated flows photogrammetry; underwater imaging; eco-hydraulics; flow visualization and imaging; laboratory studies; plants reconfiguration; vegetated flows
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Wackrow, R.; Ferreira, E.; Chandler, J.; Shiono, K. Camera Calibration for Water-Biota Research: The Projected Area of Vegetation. Sensors 2015, 15, 30261-30269.

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