基于亚像素边缘检测的液位测量系统研究
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摘要
针对化工、医药等领域中透明试剂的液位测量存在精度低、智能化水平达不到要求的问题。文中在线阵CCD测量技术基础上提出一种非接触透射式的高精度液位检测系统,采用一维图像亚像素边缘检测算法确定液位边缘,再进行阈值比较与直线拟合分析,确定液位像素点坐标,实现液位快速高精度测量。经过多次实验验证,测量范围为5～25 mm时,误差低于10μm,分辨率优于5μm。
The liquid level measurement of the transparent reagents in the chemical and medical fields has a low precision,and the level of intelligence can't reach the requirement.A measurement technique based on linear CCD was proposed with high precision liquid level detection system for non-contact transmission,using sub-pixel edge detection algorithm to determine the level of one dimension image edge,compared with the linear fitting to determine the coordinates of the pixel threshold level,realizing fast and high precision measurement of liquid level.After several experiments,the measuring device range is 5～25 mm,the error is better than 10 μm,and the resolution is better than 5 μm.
The liquid level measurement of the transparent reagents in the chemical and medical fields has a low precision,and the level of intelligence can't reach the requirement.A measurement technique based on linear CCD was proposed with high precision liquid level detection system for non-contact transmission,using sub-pixel edge detection algorithm to determine the level of one dimension image edge,compared with the linear fitting to determine the coordinates of the pixel threshold level,realizing fast and high precision measurement of liquid level.After several experiments,the measuring device range is 5～25 mm,the error is better than 10 μm,and the resolution is better than 5 μm.
引文
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[3] 张永宏,胡德金,张凯,等.基于灰度矩的CCD图像亚像素边缘检测算法研究[J].光学技术,2004,30(6):693-695.
[4] 毕继耀,张大伟,杨海马,等.线阵CCD光谱分辨率检测系统设计[J].电子测量与仪器学报,2015,29(7):1086-1092.
[5] 俞巧云,邢晓正,胡红专等.直线拟合方法在一维图像边缘检测中的应用[J].光电工程,2001,28(6):56-58,65.
[6] ZHAGN W J,LI D,YE F.Sub-pixel edge detection method based on sigmoid function fitting[J].Journal of South China University of Technology,2009,37(10):39-43.
[7] 高润,牛春晖,李晓英,等.632nm激光对CCD干扰效果仿真与实验研究[J].激光与红外,2016,46(5):552-557.
[8] HAGARA M,STOJANOVI,et al.Localization of moving edge with sub-pixel accuracy in 1-D images and its FPGA implementation[J].Microprocessors & Microsystems,2017,51:1-7.
[9] 杜冬,尹学峰,吉小军.基于FPGA的脉冲信号发生/测试仪一体化设计[J].电子测量技术,2015,38(1):64-68.
[10] 彭宏,赵鹏博.边缘检测中的改进型均值滤波算法[J].计算机工程,2017,43(10):172-178.
[11] KALRA A,CHHOKAR R L.A hybrid approach using sobel and canny operator for digital image edge detection[C].International Conference on Micro-Electronics and Telecommunication Engineering.IEEE,2017:305-310.
[12] 徐鸿,郭鹏,田振华,等.非浸入式超声导波液位测量方法研究[J].仪器仪表学报,2017,38(5):1150-1158.
[13] 刘奋飞,赵辉,陶卫.改进的直线拟合线阵CCD图像边缘检测方法[J].光电工程,2005(03):40-43
[14] XU G S.Linear array CCD image sub-pixel edge detection based on wavelet transform[C].Second International Conference on Information and Computing Science.IEEE Computer Society,2009:204-206.
[15] HAO Y J,LIU X B.Driving circuit design for high frame rate CCD image senor[C].IEEE 15th International Conference on Advanced Computational Intelligence,2012:1013-1016.
[16] HAGARA M,STOJANOVIE R,KUBINEC P,et al.Localization of moving edge with sub-pixel accuracy in 1-D images and its FPGA implementation[J].Microprocessors & Microsystems,2017,51:1-7.
[17] WEI Z,ZHAO M,TONG Y.Sub-pixel edge detection algorithm based on the fitting of gray gradient and hyperbolic tangent function[J].Lecture Notes in Electrical Engineering,2014,246:287-294.
[18] 迟涵文,朱礼尧,吴涛,等.基于单片机的线阵CCD驱动模块硬件设计与实现[J].国外电子测量技术,2015(11):76-79.