光学精密工程2025，Vol.33Issue(16)：2578-2591,14.DOI:10.37188/OPE.20253316.2578
基于亚像素边缘检测融合光照补偿的远心成像标定方法
Telecentric imaging calibration via integrated sub-pixel edge detection and illumination compensation
摘要
Abstract
To address the high-precision calibration demands of telecentric imaging systems and the inade-quacy of traditional pinhole models,this paper proposed a high-accuracy camera calibration method that in-tegrated subpixel edge detection with illumination error compensation.First,an improved Gaussian inte-gral curve fitting algorithm extracted subpixel edges of circular calibration targets,with center coordinates precisely determined via weighted iterative least squares.Second,a system magnification equation was de-rived based on the telecentric model and rotation matrix orthogonality to resolve extrinsic parameter sign ambiguities,accompanied by a disambiguation strategy.Subsequently,radial,tangential,and composite distortion models were constructed and evaluated for characterizing telecentric lens distortion.Distortion parameters were accurately estimated through Levenberg-Marquardt nonlinear optimization.An illumina-tion error compensation model dynamically updated correction parameters within the calibration pipeline to eliminate edge offset errors.Experimental results show the calibration method achieves an optimal repro-jection error of 0.059 pixels,with measurement errors within 1.6 μm for CMM probe ball diameter under 15-28 light intensity levels after compensation,validating its effectiveness.关键词
远心镜头标定/亚像素边缘检测/加权迭代圆心拟合/光强误差补偿Key words
telecentric lens calibration/subpixel edge detection/weighted iterative circle fitting/compen-sation for light intensity errors分类
信息技术与安全科学引用本文复制引用
袁竟,林虎,石照耀,王宪,杨国梁..基于亚像素边缘检测融合光照补偿的远心成像标定方法[J].光学精密工程,2025,33(16):2578-2591,14.基金项目
国家自然科学基金(No.52227809) （No.52227809）
