本文選題：單目視覺 + 平面測量��； 參考：《儀器儀表學報》2017年09期

【摘要】：河流水面成像測速是一種非接觸式測流技術(shù),其中流場的定標主要基于直接線性變換法(DLT)。由于嚴重依賴于河流兩岸控制點的數(shù)量、分布及坐標勘測精度,現(xiàn)有測量系統(tǒng)受到野外復雜施測條件的制約而難以快速安全布設(shè)。對此提出了一種基于物像尺度變換(OIS)的流場定標方法。在考慮相機傾角及水位變化的基礎(chǔ)上,通過建立傾斜視角下變高平面的成像模型,推導出像平面和河流水面間"點-距離"的變換關(guān)系。進而設(shè)計一種激光測距儀輔助的測量裝置及其檢校方法用于模型參數(shù)的獲取。實驗結(jié)果表明,OIS法在精度方面與DLT法相當,但無需在現(xiàn)場采用全站儀布設(shè)控制點,顯著提高了野外作業(yè)的效率和安全性。研究有望為新型集成一體化光學測流儀器的設(shè)計提供理論和技術(shù)方法上的支撐。
[Abstract]:River surface imaging velocimetry is a non-contact flow measurement technique in which the calibration of flow field is mainly based on direct linear transformation (DLT). Due to the heavy dependence on the number, distribution and coordinate survey accuracy of the control points on both sides of the river, the existing survey systems are restricted by the complex field survey conditions and are difficult to be quickly and safely arranged. In this paper, a flow field calibration method based on object scale transformation (OIS) is proposed. On the basis of considering the variation of camera inclination and water level, the transformation relationship of "point-distance" between the image plane and the river surface is derived by establishing the imaging model of the elevation plane under the inclined angle. Then a laser rangefinder auxiliary measuring device and its calibration method are designed to obtain the model parameters. The experimental results show that the precision of the OIS method is comparable to that of the DLT method, but it is not necessary to use the total station to set up the control points in the field, which improves the efficiency and safety of the field work. The research is expected to provide theoretical and technical support for the design of a new integrated optical current measuring instrument.
【作者單位】： 江西省水信息協(xié)同感知與智能處理重點實驗室;河海大學計算機與信息學院;
【基金】：江西省水信息協(xié)同感知與智能處理重點實驗室開放基金(2016WICSIP006) 江蘇省自然科學基金青年基金(BK20170891) 國家自然科學基金青年科學基金(51709083) 中央高�；究蒲袠I(yè)務(wù)費專項資金(2017B16914)項目資助
【分類號】：P332;TP391.41
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本文編號：2073146