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@ARTICLE{Biskup:52406,
      author       = {Biskup, B. and Scharr, H. and Schurr, U. and Rascher, U.},
      title        = {{A} stereo imaging system for measuring structural
                      parameters of plant canopies},
      journal      = {Plant, cell $\&$ environment},
      volume       = {30},
      issn         = {0140-7791},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {PreJuSER-52406},
      pages        = {1299 - 1308},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Plants constantly adapt their leaf orientation in response
                      to fluctuations in the environment, to maintain radiation
                      use efficiency in the face of varying intensity and
                      incidence direction of sunlight. Various methods exist for
                      measuring structural canopy parameters such as leaf angle
                      distribution. However, direct methods tend to be
                      labour-intensive, while indirect methods usually give
                      statistical information on stand level rather than on
                      individual leaves. We present an area-based, binocular
                      stereo system composed of commercially available components
                      that allows three-dimensional reconstruction of small- to
                      medium-sized canopies on the level of single leaves under
                      field conditions. Spatial orientation of single leaves is
                      computed with automated processes using modern,
                      well-established stereo matching and segmentation
                      techniques, which were adapted for the properties of plant
                      canopies, providing high spatial and temporal resolution
                      (angle measurements with an accuracy of approx. +/-5 degrees
                      and a maximum sampling rate of three frames per second). The
                      applicability of our approach is demonstrated in three case
                      studies: (1) the dihedral leaflet angle of an individual
                      soybean was tracked to monitor nocturnal and daytime leaf
                      movement showing different frequencies and amplitudes; (2)
                      drought stress was diagnosed in soybean by quantifying
                      changes in the zenith leaflet angle distribution; and (3)
                      the diurnal course of the zenith leaf angle distribution of
                      a closed soybean canopy was measured.},
      keywords     = {Circadian Rhythm / Disasters / Image Processing,
                      Computer-Assisted: methods / Imaging, Three-Dimensional /
                      Plant Leaves: anatomy $\&$ histology / Soybeans: anatomy
                      $\&$ histology / Time Factors / J (WoSType)},
      cin          = {ICG-3},
      ddc          = {570},
      cid          = {I:(DE-Juel1)ICG-3-20090406},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Plant Sciences},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:17727419},
      UT           = {WOS:000249423300008},
      doi          = {10.1111/j.1365-3040.2007.01702.x},
      url          = {https://juser.fz-juelich.de/record/52406},
}