A technique for improving webcam precision in biological plant measurement
Article
Article Title | A technique for improving webcam precision in biological plant measurement |
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ERA Journal ID | 4654 |
Article Category | Article |
Authors | Chong, Albert K. (Author) and Brownstein, Gretchen (Author) |
Journal Title | The Photogrammetric Record |
Journal Citation | 25 (130), pp. 180-196 |
Number of Pages | 17 |
Year | 2010 |
Place of Publication | United Kingdom |
ISSN | 0031-868X |
1477-9730 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/j.1477-9730.2010.00578.x |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/full/10.1111/j.1477-9730.2010.00578.x |
Abstract | In an attempt to harness webcam technology for the biological monitoring of grassland plants, a Microsoft LifeCam-based photogrammetric system was developed for the remote capture of 3D measurements of plants. Research was necessary to determine the metric quality of this webcam imagery for photogrammetric 3D measurement. This paper presents the details of a qualitative evaluation of a LifeCam VX-3000 for indoor and outdoor photogrammetric measurement together with the results of a case study involving two common small grassland plants. In the evaluation, laboratory and in-situ principal distance (PD) determination techniques were performed, thus evaluating the significance of the latter for improving measurement accuracy in an uncontrolled environment despite the ineffective focusing of this imaging sensor. The effect of outdoor ambient temperature on the PD was investigated. Results show that sharp focusing is a problem with this webcam, as shown by the disparity of the laboratory-determined PD of various object distances. However, the determination of the PD using field images improves the measurement accuracy. Using this approach, 3D measurement accuracy of between 0Æ3±0Æ2 and 1Æ7±0Æ4mm was achieved, depending on the type of grass observed and the digitising technique used. |
Keywords | ambient temperature; biological plant; camera self-calibration; in-situ principal distance determination; webcam |
ANZSRC Field of Research 2020 | 300199. Agricultural biotechnology not elsewhere classified |
460306. Image processing | |
410404. Environmental management | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Department of Surveying and Land Information |
University of Otago, New Zealand | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q07v3/a-technique-for-improving-webcam-precision-in-biological-plant-measurement
2029
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