变形测量系统中激光光斑中心精确定位算法
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摘要
针对变形测量系统中激光光斑中心精确定位的要求,在重心法的基础上,提出了基于重心法的曲线拟合亚像素定位算法。该算法首先用变结构元多尺度广义形态滤波算法滤除图像噪声,然后用重心法计算出激光光斑的亚像素位置,最后用曲线拟合对激光光斑的中心位置进行精确定位。根据变形测量原理,搭建了实验平台,通过多次实验,变形角的标准差均小于20″。实验结果表明,该算法能有效地提高变形测量系统的测量精度。
The barycentric sub-pixel location algorithm of curve fitting is proposed to meet the requirements of pre-cise laser spot center positioning in distortion measurement system.First,the multi-scale generalized morphological fil-tering algorithm of variable structure element is used to filter image noise.Then,the sub-pixel position of laser spot is calculated in barycenter algorithm.Finally,curve fitting is used to locate the laser spot center precisely.The experimental platform is set up according to the distortion measurement principle.With many experiments,standard deviation of distor-tion angle is less than 20".The experiment results show that the location algorithm can improve distortion measurement accuracy effectively.
The barycentric sub-pixel location algorithm of curve fitting is proposed to meet the requirements of pre-cise laser spot center positioning in distortion measurement system.First,the multi-scale generalized morphological fil-tering algorithm of variable structure element is used to filter image noise.Then,the sub-pixel position of laser spot is calculated in barycenter algorithm.Finally,curve fitting is used to locate the laser spot center precisely.The experimental platform is set up according to the distortion measurement principle.With many experiments,standard deviation of distor-tion angle is less than 20".The experiment results show that the location algorithm can improve distortion measurement accuracy effectively.
引文
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[12]秦然.基于神经网络的CT脑血管图像边缘检测算法[J].电子测量与仪器学报,2010,24(4):346-352.QIN R.Edge information extraction algorithm for CT cerebrovascular medical image based on neural net-work[J].Journal of Electronic Measurement and In-strument,2010,24(4):346-352.
[13]赵爱明.基于二次曲线拟合的图像亚像素边缘定位算法[J].哈尔滨理工大学学报,2006,11(3):68-70.ZHAO AI M.Sub pixel edge detection algorithm based on guadrativ curve fitting[J].Journal of Harbin Univer-sity of Science and Technology,2006,11(3):68-70.
[14]刘金华,佘堃.双树复小波域图像非线性扩散滤波[J].电子测量与仪器学报,2010,24(3):268-273.LIU J H,SHE K.Image nonlinear diffusion filtering in dual tree complex wavelet domain[J].Journal of Elec-tronic Measurement and Instrument,2010,24(3):268-273.
[15]郑月英,钱唯德,罗俊,等.基于曲线拟合的亚像素边缘定位方法的研究[J].光学技术,2007,32(3):386-394.ZHENG Y Y,QIAN W D,LUO J,et al.Study on sub-pixel edge location method based on curve fitting[J].Optical Technique,2007,32(3):386-394.
[16]鲁昌华,付能.基于数字形态学的医用管制瓶边缘检测[J].电子测量与仪器学报,2008,22(6):87-90.LU CH H,FU N.Edge detection of tube-type bottle based on mathematical morphology[J].Journal of Elec-tronic Measurement and Instrument,2008,22(6):87-90.
[17]黄桂平,钦桂勤.大尺寸三坐标测量方法与系统[J].宇航计测技术,2007,27(4):15-19.HUANG G P,QIN G Q.Measurement methods of the large scale 3D coordinate and its system[J].Journal of Astronautic Metrology and Measurement,2007,27(4):15-19.
[2]张丽群.基于相关法的多重成像亚像素定位算法的研究与实现[D].哈尔滨:哈尔滨工程大学,2005.ZHANG L Q.Study on multiple-camera sub-pixel locat-ing algorithm based on correlation[D].Harbin:Harbin Engineering University,2005.
[3]杨博雄.CCD细分技术及其应用研究[D].北京:中国地震局地球物理研究所,2005.YANG B X.CCD subdivision technology and its appli-cation research[D].Beijing:Institute of Geophysics CEA,2005.
[4]张毅刚,曹阳,项学智.静态背景差分运动目标检测研究[J].电子测量与仪器学报,2010,24(5):494-499.ZHANG Y G,CAO Y,XIANG X ZH.Moving targets detection of static background subtraction[J].Journal of Electronic Measurement and Instrument,2010,24(5):494-499.
[5]邢德奎,达飞鹏,张虎.圆形目标精密定位方法的研究与应用[J].仪器仪表学报,2009,30(12):2593-2598.XING D K,DA F P,ZHANG H.Research and applica-tion of locating of circular target with high accuracy[J].Chinese Journal of Scientific Instrument,2009,30(12):2593-2598.
[6]刘绍锦,王志乾.基于DSP的高精度变形角测量系统[J].测控技术,2009,28(9):14-16.LIU SH J,WANG Z Q.Design of high precision meas-uring system for angle distortion[J].Measurement&control technology,2009,28(9):14-16.
[7]敖磊,谭久彬,崔继文,等.激光CCD二维自准直仪中圆目标中心精确定位算法[J].光学精密工程,2005,13(6):668-673.AO L,TAN J B,CUI J W,et al.Precise center location algorithm for circle target in CCD laser dual axis auto-collimator[J].Optics and Precision Engineering,2005,13(6):668-673.
[8]胡学龙,程茜,杨莉.基于形态滤波和梯度模糊GHMT的组合边缘检测[J].电子测量与仪器学报,2008,22(3):55-58.HU X L,CHENG X,YANG L.Combined edge detec-tion method based on morphology filtering and gradient fuzzy GHMT[J].Journal of Electronic Measurement and Instrument,2008,22(3):55-58.
[9]魏本征,赵志敏,华晋.基于改进形态学梯度和Zernike矩的亚像素边缘检测方法[J].仪器仪表学报,2010,31(4):838-844.WEI B ZH,ZHAO ZH M,HUA J.Sub-pixel edge detec-tion method based on improved morphological gradient and Zernike moment[J].Chinese Journal of Scientific Instrument,2010,31(4):838-844.
[10]潘波,杨根庆,刘勇.星点质心定位算法最优门限研究[J].光学精密工程,2008,16(9):1787-1792.PAN B,YANG G Q,LIU Y.Study on optimization threshold of centroid algorithm[J].Optics and Precision Engineering,2008,16(9):1787-1792.
[11]陈晓东,李为民,李静,等.利用重心法求光斑信号位置的误差分析[J].光学技术,2000,26(1):5-8.CHEN X D,LI W M,LI J,et al.Error analysis of the center of gravity method when used to get the position of a facula[J].Optical Technique,2000,26(1):5-8.
[12]秦然.基于神经网络的CT脑血管图像边缘检测算法[J].电子测量与仪器学报,2010,24(4):346-352.QIN R.Edge information extraction algorithm for CT cerebrovascular medical image based on neural net-work[J].Journal of Electronic Measurement and In-strument,2010,24(4):346-352.
[13]赵爱明.基于二次曲线拟合的图像亚像素边缘定位算法[J].哈尔滨理工大学学报,2006,11(3):68-70.ZHAO AI M.Sub pixel edge detection algorithm based on guadrativ curve fitting[J].Journal of Harbin Univer-sity of Science and Technology,2006,11(3):68-70.
[14]刘金华,佘堃.双树复小波域图像非线性扩散滤波[J].电子测量与仪器学报,2010,24(3):268-273.LIU J H,SHE K.Image nonlinear diffusion filtering in dual tree complex wavelet domain[J].Journal of Elec-tronic Measurement and Instrument,2010,24(3):268-273.
[15]郑月英,钱唯德,罗俊,等.基于曲线拟合的亚像素边缘定位方法的研究[J].光学技术,2007,32(3):386-394.ZHENG Y Y,QIAN W D,LUO J,et al.Study on sub-pixel edge location method based on curve fitting[J].Optical Technique,2007,32(3):386-394.
[16]鲁昌华,付能.基于数字形态学的医用管制瓶边缘检测[J].电子测量与仪器学报,2008,22(6):87-90.LU CH H,FU N.Edge detection of tube-type bottle based on mathematical morphology[J].Journal of Elec-tronic Measurement and Instrument,2008,22(6):87-90.
[17]黄桂平,钦桂勤.大尺寸三坐标测量方法与系统[J].宇航计测技术,2007,27(4):15-19.HUANG G P,QIN G Q.Measurement methods of the large scale 3D coordinate and its system[J].Journal of Astronautic Metrology and Measurement,2007,27(4):15-19.
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