Chong, Albert K. and Brownstein, Gretchen (2010) A technique for improving webcam precision in biological plant measurement. Photogrammetric Record, 25 (130). pp. 180-196. ISSN 0031-868X
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Official URL: http://dx.doi.org/10.1111/j.1477-9730.2010.00578.x
Identification Number or DOI: doi: 10.1111/j.1477-9730.2010.00578.x
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.
|Item Type:||Article (Commonwealth Reporting Category C)|
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|Uncontrolled Keywords:||ambient temperature; biological plant; camera self-calibration; in-situ principal distance determination; webcam|
|Fields of Research (FOR2008):||10 Technology > 1099 Other Technology > 109999 Technology not elsewhere classified|
08 Information and Computing Sciences > 0801 Artificial Intelligence and Image Processing > 080106 Image Processing
05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
|Socio-Economic Objective (SEO2008):||D Environment > 96 Environment > 9608 Flora, Fauna and Biodiversity > 960803 Documentation of Undescribed Flora and Fauna|
|Deposited On:||13 Feb 2011 19:54|
|Last Modified:||26 Nov 2012 11:42|
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