Camera Calibration for Water-Biota Research: The Projected Area of Vegetation
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 focusi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2015-12-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | http://www.mdpi.com/1424-8220/15/12/29798 |
| _version_ | 1798039496679227392 |
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| author | Rene Wackrow Edgar Ferreira Jim Chandler Koji Shiono |
| author_facet | Rene Wackrow Edgar Ferreira Jim Chandler Koji Shiono |
| author_sort | Rene Wackrow |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T21:54:41Z |
| format | Article |
| id | doaj.art-25a1a99c7fd348988b438480af263885 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T21:54:41Z |
| publishDate | 2015-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-25a1a99c7fd348988b438480af2638852022-12-22T04:01:08ZengMDPI AGSensors1424-82202015-12-011512302613026910.3390/s151229798s151229798Camera Calibration for Water-Biota Research: The Projected Area of VegetationRene Wackrow0Edgar Ferreira1Jim Chandler2Koji Shiono3School of Civil and Building Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UKSchool of Civil and Building Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UKSchool of Civil and Building Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UKSchool of Civil and Building Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UKImaging 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.http://www.mdpi.com/1424-8220/15/12/29798photogrammetryunderwater imagingeco-hydraulicsflow visualization and imaginglaboratory studiesplants reconfigurationvegetated flows |
| spellingShingle | Rene Wackrow Edgar Ferreira Jim Chandler Koji Shiono Camera Calibration for Water-Biota Research: The Projected Area of Vegetation Sensors photogrammetry underwater imaging eco-hydraulics flow visualization and imaging laboratory studies plants reconfiguration vegetated flows |
| title | Camera Calibration for Water-Biota Research: The Projected Area of Vegetation |
| title_full | Camera Calibration for Water-Biota Research: The Projected Area of Vegetation |
| title_fullStr | Camera Calibration for Water-Biota Research: The Projected Area of Vegetation |
| title_full_unstemmed | Camera Calibration for Water-Biota Research: The Projected Area of Vegetation |
| title_short | Camera Calibration for Water-Biota Research: The Projected Area of Vegetation |
| title_sort | camera calibration for water biota research the projected area of vegetation |
| topic | photogrammetry underwater imaging eco-hydraulics flow visualization and imaging laboratory studies plants reconfiguration vegetated flows |
| url | http://www.mdpi.com/1424-8220/15/12/29798 |
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