A seed point placement method for generating streamlines in context regions

IF 1.7 4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Journal of Visualization Pub Date : 2024-07-30 DOI:10.1007/s12650-024-01019-4
Qian Zhang, Zeyao Mo, HuaWei Wang, Li Xiao
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Abstract

Streamline is one of the main methods for flow field visualization, which describes the distribution pattern of the flow field through the flow trajectory of seed points. Currently, most of the work focuses on seed point placement and streamline generation in feature regions. For context regions (blank areas), i.e., context regions without features, however, there is little research conducted. In fact, the context regions carry some flow field information, which can assist researcher in deeply understanding the entire spatial distribution of the flow field as well as the continuous transition between different feature regions. However, it is a challenging problem to generate suitable streamlines in context regions. If the streamlines are not positioned properly or have a too large number, they may severely occlude the feature regions, while too few streamlines may be difficult to fill in the entire information of the flow field. To address the problem, this article proposes a new method for seed point placement that mainly focuses on context regions. The method is divided into two steps: finding context regions and then placing seed points in context regions. Firstly, use 3D to 2D projection transformation and region connectivity algorithm to find context regions, where no feature streamlines pass through. The streamlines in a context region often have similar directions due to being away from critical points. Then, according to the direction of the streamlines, evenly place seed points in the 3D space. As a result, spatially uniform streamlines are generated to fill the context regions, which makes the flow field information more complete. Qualitative and quantitative evaluations show that the method proposed in this article can generate visually uniform streamlines in context regions, together with feature streamlines, which can help researchers to coherently understand the overall characteristics of the flow field.

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在背景区域生成流线的种子点放置方法
摘要 流线是流场可视化的主要方法之一,它通过种子点的流动轨迹描述流场的分布模式。目前,大多数工作都集中在特征区域的种子点放置和流线生成上。然而,对于上下文区域(空白区域),即没有特征的上下文区域,却鲜有研究。事实上,上下文区域包含一些流场信息,可以帮助研究人员深入了解流场的整体空间分布以及不同特征区域之间的连续过渡。然而,在上下文区域生成合适的流线是一个具有挑战性的问题。如果流线位置不当或数量过多,可能会严重遮挡特征区域,而流线数量过少又难以填满流场的全部信息。针对这一问题,本文提出了一种主要针对背景区域的种子点放置新方法。该方法分为两个步骤:寻找上下文区域,然后在上下文区域中放置种子点。首先,利用三维到二维的投影变换和区域连通性算法找到没有特征流线经过的上下文区域。由于远离临界点,上下文区域中的流线往往方向相似。然后,根据流线的方向,在三维空间中均匀放置种子点。这样,就会生成空间上均匀的流线来填充上下文区域,从而使流场信息更加完整。定性和定量评估结果表明,本文提出的方法可以在上下文区域生成视觉上均匀的流线以及特征流线,有助于研究人员连贯地理解流场的整体特征。
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来源期刊
Journal of Visualization
Journal of Visualization COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS-IMAGING SCIENCE & PHOTOGRAPHIC TECHNOLOGY
CiteScore
3.40
自引率
5.90%
发文量
79
审稿时长
>12 weeks
期刊介绍: Visualization is an interdisciplinary imaging science devoted to making the invisible visible through the techniques of experimental visualization and computer-aided visualization. The scope of the Journal is to provide a place to exchange information on the latest visualization technology and its application by the presentation of latest papers of both researchers and technicians.
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