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首页> 外文会议>2016 IEEE International Conference on Functional-Structural Plant Growth Modeling, Simulation, Visualization and Applications >Automated characterization of the mature root system form by a double-quadrangle-shaped polygon
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Automated characterization of the mature root system form by a double-quadrangle-shaped polygon

机译：通过双四边形多边形自动表征成熟的根系

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摘要

We describe in this paper a new global approach to characterize the geometry of the root system area from black-and-white silhouettes. We introduce a covering polygon composed of two superimposed quadrangles to evaluate geometry features or to classify the growth strategy of root systems: the convex hull of the root system is progressively reduced to a double-quadrangle-shaped polygon by iterative suppression of least significant vertices to only keep the major geometry features. The root system density is addressed by the analysis of the hole distribution. The root system porosity is estimated from the decomposition of background regions in circular elements. An automated repartition of circular elements by 2-means clustering is introduced for a best appreciation of macro- and micro-holes, respectively associated to the anchorage and nutrient recovery potentials. The global parameters of the root system are evaluated from the geometry and density properties of the double-quadrangle-shaped polygon. The experimental studies address the sensitivity of the double-quadrangle-shaped polygon, especially the evaluation of the geometrical stability of the polygon according to slight variations of the root system segmentation. Several experiments, performed using a representative set composed of 100 root system silhouettes of several species - arabidopsis, chick pea, palm tree, rice, sorghum, and wheat - at different stages of growth, underline the robustness of the shape parameters, especially the upper and lower penetration angles.
机译：我们在本文中描述了一种新的全局方法，该方法可以从黑白轮廓中描绘出根系区域的几何形状。我们引入了一个由两个重叠的四边形组成的覆盖多边形，以评估几何特征或对根系统的生长策略进行分类：通过迭代地将最小有效顶点抑制为，根系统的凸包逐渐减少为双四边形多边形。仅保留主要的几何特征。通过分析孔的分布来解决根系密度。根系孔隙度是根据圆形元素中背景区域的分解估算的。引入了通过2均值聚类对圆形元素进行自动重新分配的方法，以最佳地理解分别与锚固和养分回收潜力相关的大孔和微孔。从双四边形多边形的几何形状和密度属性评估根系统的全局参数。实验研究解决了双四边形多边形的敏感性问题，特别是根据根系分割的细微变化对多边形的几何稳定性进行了评估。使用具有代表性的一组进行的数个实验，由不同种类的100种根系轮廓组成-拟南芥，鹰嘴豆，棕榈树，水稻，高粱和小麦-在不同的生长阶段，强调了形状参数（尤其是上部）的稳健性和较低的穿透角。

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