基于Bresenham算法的仪表示值自动读取方法
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摘要
指针式仪表所处光源环境变化会在仪表盘上产生阴影,致使仪表指针读数产生误差。为此,设计了一种对光源要求较低、抗干扰性能较强的仪表示值读取系统。系统基于直线最小灰度值原理确定指针位置,并使用Bresenham画直线算法绘制指针位置直线,采用比例法和角度法自动读取仪表示值。实验结果表明:该方法能够实现指针位置的提取和仪表示值的自动读取。
Under the lighting, the change of the light in the environment where the instrument works can result in great inconvenience to the reading of the instrument pointer and incurs its reading errors. In this paper, a pointer instrument reading system which asks for lower light source and has strong anti-disturbance performance was designed. This reading system has the straight line minimum gray value and the principle based to determine the pointer position and the Bresenham drawing algorithm used to determine the pointer's straight line as well as the proportional method and the angle method adopted to read the instrument numbers automatically. The experimental results show that this method can realize both the pointer position extraction and auto-reading of the instrument value.
Under the lighting, the change of the light in the environment where the instrument works can result in great inconvenience to the reading of the instrument pointer and incurs its reading errors. In this paper, a pointer instrument reading system which asks for lower light source and has strong anti-disturbance performance was designed. This reading system has the straight line minimum gray value and the principle based to determine the pointer position and the Bresenham drawing algorithm used to determine the pointer's straight line as well as the proportional method and the angle method adopted to read the instrument numbers automatically. The experimental results show that this method can realize both the pointer position extraction and auto-reading of the instrument value.
引文
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[2] 冯养杰,林小竹.基于改进Hough变换的指针式仪表自动识别方法研究[J].北京印刷学院学报,2015,23(4):62～66.
[3] 宋伟,张文杰,张家齐,等.基于指针区域特征的仪表读数识别算法[J].仪器仪表学报,2014,35(z2):50～58.
[4] 万杰.一种基于图像识别的快速指针读数方法[J].计算机光盘软件与应用,2013,16(18):307～309.
[5] Alegria E C,Serra A C.Automatic Calibration of Analog and Digital Measuring Instruments Using Computer Vision[J].IEEE Transactions on Instrumentation and Measurement,2000,49(1):94～99.
[6] Zhang T Y,Suen C Y.A Fast Parallel Algorithm for Thinning Digital Patterns[J].ACM,1984,27(3):236～239.
[7] 陈彬,金连文.一种仪表指针位置检测的中心投影法[J].计算机应用研究,2005,22(1):246～248.
[8] 张刘胜,隋成华,童建平.基于图像处理的模拟指针表的自动识别[J].浙江工业大学学报,2008,36(3):242～245.
[9] 贺洪江,王国杰,王淑欣.基于等分像素点的直线生成算法[J].计算机应用与软件,2007,24(6):147～148.
[10] 庄建东,曾勇进.基于中点画圆法快速生成圆的方法研究及实现[J].教育教学论坛,2011,(29):160～162.