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1.苏州科技大学 电子信息工程学院,江苏 苏州 215009
2.中国科学院长春光学精密机械与物理研究所,吉林 长春 130033
[ "李娜(1995-),女,安徽阜阳人,硕士生,2018年于滁州学院获得学士学位,主要研究数字图像处理和光电信息检测。E-mail: 2421689534@qq.com" ]
[ "董兴法(1963‒)男,江苏苏州人,博士,教授,2005于南开大学光电子专业获得博士学位,主要从事光电信息技术与仪器的研究。E-mail: dongxfa@mail.usts.edu.cn" ]
收稿日期:2020-07-17,
修回日期:2020-12-27,
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李娜, 王军, 董兴法, 等. 基于改进Hough变换的指针式仪表识别方法[J/OL]. 液晶与显示, 2021,1-8.
Na LI, Jun WANG, Xing-fa DONG, et al. Pointer meter recognition method based on improved hough transform[J/OL]. Chinese journal of liquid crystals and displays, 2021, 1-8.
李娜, 王军, 董兴法, 等. 基于改进Hough变换的指针式仪表识别方法[J/OL]. 液晶与显示, 2021,1-8. DOI: 10.37188/CJLCD.2020-179.
Na LI, Jun WANG, Xing-fa DONG, et al. Pointer meter recognition method based on improved hough transform[J/OL]. Chinese journal of liquid crystals and displays, 2021, 1-8. DOI: 10.37188/CJLCD.2020-179.
为解决指针式仪表自动识别系统中,不均匀光照,精确度不高等问题,提出一种Otsu算法和改进的Hough算法对仪表图像进行处理,首先预处理仪表图像,增强仪表指针区域特征,Otsu算法进行图像二值化,分割出仅属于指针的像素,在进行改进的Hough变换检测指针,通过快速提取表盘指针连通区域的中心像素点,结合表盘圆心约束,对提取过的像素点进行双阈值Hough变换直线检测,实验表明,提出的算法识别仪表读数最大相对误差在4.76%左右,满足系统精确度要求。
In order to solve the problems of uneven illumination and low accuracy in the automatic recognition system of pointer instruments, an Otsu algorithm and an improved Hough algorithm are proposed to process the instrument image. Firstly, the instrument image is preprocessed to enhance the characteristics of the instrument pointer area, Otsu algorithm perform image binarization to segment pixels that only belong to the pointer, and perform improved Hough transform to detect the pointer. By quickly extracting the center pixel point of the dial pointer's connected area, combined with the dial center constraint, double threshold Hough is performed on the extracted pixel point Transform straight line detection. Experiments show that the proposed algorithm detects the meter reading error at about 4.76%, which meets the system accuracy requirements.
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