本文選題：氣液兩相流 + 小波去噪��； 參考：《天津大學》2016年碩士論文

【摘要】：最近幾十年,隨著科學技術不斷推動,氣液兩相流廣泛應用于石油、醫(yī)學、制造、航天、生物等多方面領域。氣液兩相流測量技術得到了廣泛重視,從二維測量逐漸發(fā)展為三維測量,為氣液兩相流研究提供了更廣闊的研究平臺。圖像處理與重建,以及可視化測量成為主要的研究手段之一,并不斷取得理論及技術成果。本文基于高速攝影法,通過實驗所得圖像測量氣液兩相流參數,搭建了基于OpenGL的軟件平臺,針對氣液兩相流特征提出了三維重建算法。同時設計三維重建結果的評估方法,通過對圖像處理結果深入研究和比較,實現算法優(yōu)化和誤差補償。其中本課題相關研究工作總結如下:1、設計和優(yōu)化了圖像處理算法。圖像處理算法設計,包括圖像灰度、差影、反色、中值濾波、閾值分割等。針對課題中圖像去噪難點進行深入分析。對幾種去噪算法特性比較,基于小波變換理論分析,通過小波去噪對中值濾波以及閾值分割進行算法優(yōu)化。2、研究和分析圖像匹配技術國內外現狀,實現快速、精確的圖像匹配算法。結合課題實驗研究,針對匹配算法的高精度需求,采用基于輪廓和對數極坐標變換的匹配算法�；跉馀葺喞卣�,使匹配速度大幅提高。對數極坐標變換適用于實驗課題下高密度氣泡的基于輪廓特征匹配,通過設計實現圖像匹配評價方法,表明對數極坐標匹配精準度更高、匹配成功率更高。3、基于圖像預處理和圖像匹配算法,設計圖像插值算法。通過對高密度多相流氣泡特性分析,實驗驗證多項式插值可滿足精度要求,并取得較好的可視化效果。設計了圖像插值評價方法,通過結果數據分析,多項式插值精度高、程序運行時間短。4、基于OpenGL三維重建平臺設計。通過對實驗課題深入研究,OpenGL軟件平臺適用于氣液兩相流三維重建算法研究以及可視化實現。根據實驗參數精度和可視化需求,平臺實現了圖像窗口大小、旋轉變換、背景渲染、多視角視圖、硬件控制等軟件設計。
[Abstract]:In recent decades, with the development of science and technology, gas-liquid two-phase flow has been widely used in many fields such as petroleum, medicine, manufacture, spaceflight, biology and so on.The technology of gas-liquid two-phase flow measurement has been paid more and more attention, from two-dimensional measurement to three-dimensional measurement, which provides a broader research platform for gas-liquid two-phase flow research.Image processing and reconstruction, as well as visual measurement, have become one of the main research methods, and continue to achieve theoretical and technical results.In this paper, based on high-speed photography, the parameters of gas-liquid two-phase flow are measured by experimental images, a software platform based on OpenGL is built, and a three-dimensional reconstruction algorithm for gas-liquid two-phase flow characteristics is proposed.At the same time, the evaluation method of 3D reconstruction results is designed, and the algorithm optimization and error compensation are realized through the in-depth study and comparison of image processing results.The related research work is summarized as follows: 1. The image processing algorithm is designed and optimized.Image processing algorithm design, including image grayscale, differential image, inverse color, median filter, threshold segmentation and so on.The difficulty of image denoising is analyzed deeply.The characteristics of several denoising algorithms are compared. Based on the wavelet transform theory, the median filtering and threshold segmentation are optimized by wavelet denoising. The present situation of image matching technology is studied and analyzed.Accurate image matching algorithm.The matching algorithm based on contour and logarithmic polar transformation is adopted to meet the high precision requirement of the matching algorithm.Based on the bubble profile feature, the matching speed is greatly improved.Logarithmic polar coordinate transformation is suitable for contour feature matching of high-density bubbles under experimental project. The method of image matching evaluation is designed and realized, which shows that logarithmic polar coordinate matching is more accurate.The success rate of matching is higher. 3. Based on image preprocessing and image matching algorithm, image interpolation algorithm is designed.By analyzing the bubble characteristics of high density multiphase flow, the experimental results show that polynomial interpolation can meet the precision requirements and achieve a good visualization effect.The image interpolation evaluation method is designed. Through the analysis of the result data, the polynomial interpolation accuracy is high, the program running time is short. 4. The program is designed based on OpenGL 3D reconstruction platform.The OpenGL software platform is suitable for 3D reconstruction and visualization of gas-liquid two-phase flow.According to the precision of experimental parameters and the requirement of visualization, the platform realizes the software design of image window size, rotation transformation, background rendering, multi-view view, hardware control and so on.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TP391.41

【相似文獻】

相關期刊論文 前10條

1 方立德;張濤;徐英;;基于狹縫文丘里管的氣液兩相流測量[J];傳感技術學報;2008年08期

2 王磊;傅三富;冀海峰;王保良;黃志堯;李海青;;基于非接觸電導的氣液兩相流參數檢測系統[J];工程熱物理學報;2011年08期

3 姜俊澤;張偉明;李正陽;;管道充氣排液工況下氣液兩相流數值模擬研究[J];系統仿真學報;2013年02期

4 周文興;鄧一兵;周抗寒;王偉榮;尹永利;;氣液兩相流空隙率測量方法微重力環(huán)境應用研究[J];傳感器與微系統;2009年10期

5 薛婷;孟欣東;張濤;;氣液兩相流中氣泡形態(tài)及運動特征參數提取[J];光電子.激光;2010年08期

6 方立德;梁玉嬌;李小亭;高靜哲;張琛;張W，

本文編號：1761379