基于全景成像的膛线自动跟踪缠角测量方法  

Twist Rate Measurement Method Based on Panoramic Imaging for Automatic Tracking Barrel Rifling

作　　者：景文博[1] 张俊豪 冯萱 熊泽宇 刘桐伯 夏璇 吴雪妮 王彩霞[2] Jing Wenbo;Zhang Junhao;Feng Xuan;Xiong Zeyu;Liu Tongbo;Xia Xuan;Wu Xueni;Wang Caixia(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China;College of Electronical and Information Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]长春理工大学电子信息工程学院,吉林长春130022

出　　处：《光学学报》2023年第22期170-179,共10页Acta Optica Sinica

基　　金：高等学校学科创新引智计划(D21009);科技部项目(2018YFB1107600);吉林省科技发展计划(20210201021GX)。

摘　　要：火炮整体性能评价体系中,身管缠角是至关重要的指标之一,现有缠角测量方法存在系统复杂、测量精度不高的问题,本文提出一种基于全景成像的膛线自动跟踪身管缠角测量方法。利用全景成像技术获取身管内膛全景图像,在极坐标系下推导内膛全景环形图像增强映射函数;通过建立环形模板匹配模型跟踪沿身管方向预设的阴阳膛线的边缘,完成膛线旋转角的粗定位;根据周期阴阳膛线图像对比度设计目标函数,优化目标函数完成膛线旋转角的精定位,结合身管轴向距离解算身管缠角。真实身管缠角测量实验结果表明,所提方法测量精度优于1’,能够满足实际缠角测量中的应用需求。Objective In the overall performance evaluation system of artillery,the twist rate of the barrel is a crucial indicator.Existing methods for measuring twist rate feature complexity and limited measurement accuracy.With the continuous development of optoelectronic technology,panoramic imaging devices with large field of view and high resolution have emerged to enable seamless 360°panoramic imaging in a single shot without blind spots,thus capturing comprehensive information of the measured object.However,research on measuring the twist rate of barrels based on panoramic imaging technology is limited,and existing methods mostly rely on conical refractive panoramic imaging systems.Due to the shape and material properties of the conical refractive mirror,such systems may introduce image distortion,affecting image quality and posing challenges to image stitching and unwrapping.Thus,we propose a panoramic imaging-based automatic tracking and measurement method for the twist rate of barrels using refractive panoramic imaging technology,which achieves twist rate calculation without the image unwrapping algorithms.Methods We put forward a panoramic imaging-based automatic tracking and measurement method for the twist rate of barrels.Refractive panoramic imaging technology is utilized to obtain a panoramic image inside the barrel.After obtaining the image,a detailed analysis of the characteristics of the wide-angle panoramic image is conducted,and the image is transformed from Cartesian coordinates to polar coordinates.In the polar coordinate system,the image enhancement mapping function for the panoramic ring-shaped bore image is derived to enhance the features of the twist rate.To achieve automatic tracking and measurement of the twist rate,we build an annular template matching model to track the edges of the pre-set positive and negative rifling twists along the direction of the barrel,thereby accomplishing coarse positioning of the twist rate.Next,an objective function is designed based on the contrast differences bet

关 键 词：缠角测量 全景成像 火炮身管 膛线跟踪 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]