A stereo imaging system for measuring structural parameters of plant canopies

Biskup B; Scharr H; Schurr U; Rascher U

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A stereo imaging system for measuring structural parameters of plant canopies

机译：用于测量植物冠层结构参数的立体成像系统

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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.

机译：植物可以根据环境的波动不断调整叶片的方向，以在面对强度和日光入射方向变化的情况下保持辐射的利用效率。存在多种用于测量结构冠层参数（例如叶角分布）的方法。但是，直接方法往往需要大量劳动，而间接方法通常会在林分级别而不是在单个叶子上提供统计信息。我们提出了一种由市售组件组成的基于区域的双目立体系统，该系统允许在野外条件下在单叶水平上对中小型机盖进行三维重建。单叶的空间方向是使用现代的，成熟的立体匹配和分割技术通过自动化过程进行计算的，这些技术适用于植物冠层的特性，提供了高的空间和时间分辨率（角度测量精度约为+/- 5度，最大采样率为每秒三帧）。我们的方法的适用性在三个案例研究中得到了证明：（1）跟踪单个大豆的二面角小叶角度，以监测夜间和白天叶片运动的频率和振幅，并显示不同的运动; （2）通过量化天顶小叶角度分布的变化诊断出大豆的干旱胁迫; （3）测量封闭的大豆冠层的天顶叶角分布的日变化过程。

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《Plant, Cell & Environment》 |2007年第10期|共10页
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Biskup B; Scharr H; Schurr U; Rascher U;
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中图分类植物生态学和植物地理学;
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1. A stereo imaging system for measuring structural parameters of plant canopies [J] . Biskup B, Scharr H, Schurr U, Plant, Cell & Environment . 2007,第10期

机译：用于测量植物冠层结构参数的立体成像系统
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4. A real-time measuring system for tree canopy parameters [C] . Yu Long, Zhao Zuoxi, Hong Tiansheng Proceedings of joint international agricultural conference (JIAC 2009) . 2009

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机译：煤炭地下系统设计优化：第1节煤系岩石结构参数。第2节。长壁采矿系统地层模拟器。第3节地下屋架 - 桁架支撑系统的设计标准。中期报告，1977年4月至6月。

A stereo imaging system for measuring structural parameters of plant canopies

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