Gasch Cristina, Remolar Inmaculada, Chover Miguel, Rebollo Cristina
Institute of New Image Technologies, Universitat Jaume I, Castellón E-12071, Spain.
Entropy (Basel). 2018 Mar 21;20(4):213. doi: 10.3390/e20040213.
Plants and trees are an essential part of outdoor scenes. They are represented by such a vast number of polygons that performing real-time visualization is still a problem in spite of the advantages of the hardware. Some methods have appeared to solve this drawback based on point- or image-based rendering. However, geometry representation is required in some interactive applications. This work presents a simplification method that deals with the geometry of the foliage, reducing the number of primitives that represent these objects and making their interactive visualization possible. It is based on an image-based simplification that establishes an order of leaf pruning and reduces the complexity of the canopies of trees and plants. The proposed simplification method is viewpoint-driven and uses the mutual information in order to choose the leaf to prune. Moreover, this simplification method avoids the pruned appearance of the tree that is usually produced when a foliage representation is formed by a reduced number of leaves. The error introduced every time a leaf is pruned is compensated for if the size of the nearest leaf is altered to preserve the leafy appearance of the foliage. Results demonstrate the good quality and time performance of the presented work.
植物是户外场景的重要组成部分。它们由大量多边形表示，尽管硬件有优势，但进行实时可视化仍然是个问题。基于点渲染或基于图像渲染的一些方法已出现来解决这一缺点。然而，在某些交互式应用中仍需要几何表示。这项工作提出了一种简化方法，用于处理树叶的几何形状，减少表示这些物体的图元数量，并使其交互式可视化成为可能。它基于一种基于图像的简化方法，该方法确定了叶子修剪的顺序，并降低了树木和植物树冠的复杂性。所提出的简化方法是视点驱动的，并利用互信息来选择要修剪的叶子。此外，这种简化方法避免了通常在由较少数量叶子形成树叶表示时产生的树木修剪外观。如果通过改变最近叶子的大小来保持树叶的繁茂外观，那么每次修剪叶子时引入的误差都会得到补偿。结果证明了所呈现工作的良好质量和时间性能。
