光学精密工程2025，Vol.33Issue(18)：2914-2928,15.DOI:10.37188/OPE.20253318.2914
基于交比不变性的十字形标定靶标及其识别方法
A cross-shaped calibration target based on cross-ratio invariance and its identification method
摘要
Abstract
To address the challenges of manufacturing,portability,and deformation associated with tradi-tional large-scale calibration targets in large field-of-view(FOV)measurements,a cross-shaped calibra-tion target based on cross-ratio invariance and its recognition method was proposed.First,a cross-struc-tured target was designed by vertically connecting two equal-length rulers.The target featured four arms of equal length,with circular uncoded markers arranged along each arm such that the cross-ratio among any four adjacent points remained constant at 4/3.The main structure was made of aluminum alloy or car-bon fiber composite material,ensuring both lightweight and high strength.Second,a marker encoding rule was developed based on the principle of cross-ratio invariance,and a recognition algorithm was de-signed to enable automatic detection and decoding of target points in calibration images.Finally,a physi-cal prototype of the target was fabricated and tested.Experimental results demonstrate that the proposed target can be accurately recognized even at a large tilt angle of up to 80°,and its simple structure makes it easy to manufacture,assemble,disassemble,and carry,making it well-suited for rapid calibration of wide FOV cameras in complex industrial environments.关键词
相机标定/交比不变性/十字形靶标/大视场Key words
camera calibration/cross-ratio invariance/cross-shaped calibration target/large fields of view分类
计算机与自动化引用本文复制引用
史宝全,侯轩哲,贺谦,陈先民,张文东,杨林..基于交比不变性的十字形标定靶标及其识别方法[J].光学精密工程,2025,33(18):2914-2928,15.基金项目
国家重点研发计划项目(No.2023YFF0720400) （No.2023YFF0720400）
强度与结构完整性全国重点实验室开放基金(No.LSSIKFJJ202402005) （No.LSSIKFJJ202402005）
天津市科技计划项目(No.22YFYSHZ00110) （No.22YFYSHZ00110）
陕西省技术创新引导专项(No.2024ZC-YYDP-28) （No.2024ZC-YYDP-28）
