本文關(guān)鍵詞： 表面流場(chǎng) 復(fù)雜流場(chǎng) 金字塔光流法 匹配幾率法 PTV　出處：《水利學(xué)報(bào)》2017年03期 　論文類(lèi)型：期刊論文

【摘要】：粒子匹配方法是準(zhǔn)確獲取表面流場(chǎng)的關(guān)鍵。本文詳細(xì)闡述了新近提出的基于光流算法PyrLK"角點(diǎn)-質(zhì)心"法的基本原理及具體實(shí)現(xiàn)過(guò)程,采用該方法對(duì)彎道水槽中較復(fù)雜的表面流場(chǎng)進(jìn)行計(jì)算,并與目前較為先進(jìn)的匹配幾率法進(jìn)行了對(duì)比。結(jié)果表明,對(duì)于本文所示的復(fù)雜流場(chǎng),匹配幾率法計(jì)算結(jié)果很大程度上依賴(lài)于對(duì)運(yùn)動(dòng)矢量允許偏差等參數(shù)的選取,且還會(huì)出現(xiàn)由于提取到非示蹤粒子的質(zhì)心并使其參與計(jì)算而產(chǎn)生的誤匹配;而PyrLK"角點(diǎn)-質(zhì)心"法只與運(yùn)動(dòng)圖像特征信息相關(guān),無(wú)示蹤粒子特定匹配規(guī)則的假定,在復(fù)雜流場(chǎng)中能較好地實(shí)現(xiàn)粒子的跟蹤與匹配。與匹配幾率法相比,PyrLK"角點(diǎn)-質(zhì)心"法對(duì)于復(fù)雜表面流場(chǎng)計(jì)算具有更好的適應(yīng)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.
【作者單位】： 中國(guó)水利水電科學(xué)研究院流域水循環(huán)模擬與調(diào)控國(guó)家重點(diǎn)實(shí)驗(yàn)室;水利部水沙科學(xué)與江河治理重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(11472310) 國(guó)家科技支撐計(jì)劃課題(2013BAB12B01) 國(guó)家國(guó)際科技合作專(zhuān)項(xiàng)(2015DFR70980)
【分類(lèi)號(hào)】：TV131;TP391.41

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