基于图像处理技术的指针仪表刻度提取算法  

Scale Extraction Algorithm for Point Ermeters Based on Image Processing Technology

作　　者：徐龙 刘文波[1,2,3] 戴宇庆 陈泉钢 魏佳宝 XU Long;LIU Wen-bo;DAI Yu-qing;CHENG Quan-gang;WEI Jia-bao(Nanjing University of Aeronautics and Astronautics,Nanjing 211000,China;Jiangsu Provincial Key Laboratory of Culture and Tourism for Non destructive Testing and Safety Traceability of Cultural Relics,Nanjing 211000,China;Key Laboratory of Nondestructive Testing and Monitoring Technology for High Speed Transport Facilities,Ministry of Industry and Information Technology,Nanjing 211000,China)

机构地区：[1]南京航空航天大学,江苏南京211000 [2]文物无损检测与安全溯源江苏省文化和旅游重点实验室,江苏南京211000 [3]高速载运设施的无损检测监控技术工业和信息化部重点实验室,江苏南京211000

出　　处：《航空计算技术》2024年第3期81-86,共6页Aeronautical Computing Technique

基　　金：国家自然科学基金项目资助(61871218);国家重点研发计划项目资助(2018YFB2003304);中央高校基本科研业务费项目资助(NJ2019007,NJ2020014);金属类文物无损检测及其虚拟呈现研究项目资助(NJ2023047)。

摘　　要：目前指针仪表读数方案大多只针对刻度分布均匀的仪表,只提取某些关键点,并不提取出每条刻度线,这种方案不适用于刻度线不均匀仪表。提出了一种可适用于非均匀刻度线指针仪表的刻度线提取算法,首先使用不同阈值的Canny边缘检测算法对图像进行边缘提取,从而得到多张边缘图像,并提取出边缘图像中所有满足设定条件的轮廓,然后使用类似NMS的方法去除重叠冗余的轮廓,最后使用刻度筛选与排序算法找出真实刻度线框。算法省去了深度学习方案中繁琐的步骤,只需要设定合适的参数即可达到良好的刻度线提取效果,速度快、易移植,非常适合工程实际需求。Most of the current pointer meter reading schemes are only for meters with uniform scale distribution,only extracting certain key points and not extracting each scale line,and this scheme is not applicable to meters with non-uniform scale lines.In this paper,we propose a scale line extraction algorithm that can be applied to non-uniform scale line pointer meters,this algorithm firstly uses Canny edge detection algorithm with different thresholds to extract edges from the image,so as to obtain multiple edge images,and extract all the contours that satisfy the set conditions in the edge image,and then removes overlapping and redundant contours by using a method similar to the NMS,and finally finds out the real scale line frame by using the scale filtering and sorting algorithm to find the true scale wireframe.This algorithm eliminates the cumbersome steps in the deep learning program,and only needs to set the appropriate parameters to achieve good scale line extraction,fast,easy to port,and very suitable for the actual needs of engineering.

关 键 词：指针仪表 刻度提取 图像处理 Canny边缘提取 外接矩形框 

分 类 号：V24[航空宇航科学与技术—飞行器设计] TP317[自动化与计算机技术—计算机软件与理论]