表面流场的PyrLK“角点-质心”法在复杂流场中的应用

发布时间：2018-02-27 14:13

本文关键词： 表面流场复杂流场金字塔光流法匹配几率法 PTV　出处：《水利学报》2017年03期 　论文类型：期刊论文

【摘要】：粒子匹配方法是准确获取表面流场的关键。本文详细阐述了新近提出的基于光流算法PyrLK"角点-质心"法的基本原理及具体实现过程,采用该方法对弯道水槽中较复杂的表面流场进行计算,并与目前较为先进的匹配几率法进行了对比。结果表明,对于本文所示的复杂流场,匹配几率法计算结果很大程度上依赖于对运动矢量允许偏差等参数的选取,且还会出现由于提取到非示踪粒子的质心并使其参与计算而产生的误匹配;而PyrLK"角点-质心"法只与运动图像特征信息相关,无示踪粒子特定匹配规则的假定,在复杂流场中能较好地实现粒子的跟踪与匹配。与匹配几率法相比,PyrLK"角点-质心"法对于复杂表面流场计算具有更好的适应性。
[Abstract]:Particle matching method is the key to accurately obtain the surface flow field. In this paper, the basic principle and implementation process of the recently proposed optical flow algorithm PyrLK "corner-centroid" method are described in detail. The method is used to calculate the complex surface flow field in the bend flume, and is compared with the more advanced matching probability method. The results show that, for the complex flow field shown in this paper, The results of matching probability method depend largely on the selection of parameters such as the allowable deviation of motion vector, and there will be mismatch caused by extracting the centroid of non-tracer particles and making them participate in the calculation. However, the PyrLK "corner centroid" method is only related to the feature information of the moving image and has no assumption of specific matching rules for tracer particles. Compared with the matching probability method, PyrLK "corner centroid" method is more suitable for the calculation of complex surface flow field.
【作者单位】：中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;水利部水沙科学与江河治理重点实验室;
【基金】：国家自然科学基金项目(11472310) 国家科技支撑计划课题(2013BAB12B01) 国家国际科技合作专项(2015DFR70980)
【分类号】：TV131;TP391.41

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