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Auto-focusing Technology in Perpendicular Length Measurement of Video Measuring Machine |
CHE Yi-feng1,YANG Guo-shun2,CHEN Li-guo1 |
1. School of Mechanical and Electrical Engineering, Soochow University, Suzhou, Jiangsu 215137, China
2. Aerospace Engineering Equipment Suzhou Co. Ltd, Suzhou, Jiangsu 215103, China |
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Abstract The higher the auto-focusing accuracy is, the smaller the perpendicular length measurement error of video measuring machine would be. The improved Tenengrad gradient evaluation function is selected by comparing the performance indexes of definition evaluation function.The full window is selected as the focus window. A search strategy combining rough and fine focus is proposed. In rough focus, mountain climbing search algorithm combined with binary search algorithm is used. And Gaussian curve fitting method combined with global search algorithm is used in fine focus. The experimental results show that the auto-focusing algorithm has good robustness and high accuracy which can reach 5μm (1/20 depth of field), and the average focusing time is 10 seconds which can meet the real-time requirements.
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Received: 09 February 2022
Published: 18 April 2023
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[4] |
周鹏, 胡成海, 毕超, 等. 三轴视觉测量系统自动对焦技术 [J]. 红外与激光工程, 2021, 50 (12): 443-450.
|
[3] |
黄德天, 吴志勇, 刘雪超, 等. 一种适用于任意目标的离焦深度快速自动聚焦技术 [J]. 光电子·激光, 2013, 24 (4): 799-804.
|
[12] |
韩凯歌. 基于全视野扫描成像的自动准焦算法研究 [D]. 哈尔滨: 哈尔滨工业大学, 2020.
|
[7] |
焦萍. 自动聚焦系统中评价函数和窗口构建算法的研究 [D]. 济南: 山东大学, 2018.
|
[15] |
曾海飞. 成像自适应调焦系统研究 [D]. 上海: 中国科学院大学 (中国科学院上海技术物理研究所), 2021.
|
[1] |
高金阳, 高思田, 董明利, 等. 计量型紫外显微镜实时焦点及倾角测量算法的研究 [J]. 计量学报, 2017, 38 (6): 667-670.
|
[16] |
熊锐. 基于数字图像处理的显微自动对焦技术研究 [D]. 成都: 中国科学院大学 (中国科学院光电技术研究所), 2021.
|
[9] |
谯倩. 基于自动聚焦技术的三维测量方法研究 [D]. 天津: 天津理工大学, 2020.
|
|
Gao J Y, Gao S T, Dong M L, et al. The research of real-time focusing and inclination angle measurement on metrological ultraviolet microscope [J]. Acta Metrologica Sinica, 2017, 38 (6): 667-670.
|
[2] |
毕超, 郝雪, 刘孟晨, 等. 气膜孔视觉测量系统的设计与搭建 [J]. 计量学报, 2020, 41 (7): 775-780.
|
[8] |
Guo C Z, Ma Z L, Guo X, et al. Fast auto-focusing search algorithm for a high-speed and high-resolution camera based on the image histogram feature function [J]. Applied optics, 2018, 57 (34): F44-F49.
|
[5] |
于之靖, 马凯, 王志军, 等. 采用加权最小二乘准则的影像仪自动对焦方法 [J]. 半导体光电, 2017, 38 (4): 592-597.
|
[10] |
李春桥. 基于聚焦深度法的显微聚焦算法研究 [D]. 武汉: 湖北工业大学, 2020.
|
[14] |
包丞啸. 基于图像处理的自动聚焦技术研究 [D]. 济南: 山东大学, 2021.
|
|
Huang D T, Wu Z Y, Liu X C, et al. A depth from defocus fast auto-focusing technology for any target [J]. Optoelectronics· Laser, 2013, 24 (4): 799-804.
|
|
Yu Z Y, Ma K, Wang Z J, et al. Auto-focusing method of imaging instrument by using weighted least squares criterion [J]. Semiconductor Optoelectronics, 2017, 38 (4): 592-597.
|
[6] |
Sha X P, Li W C, Lü X Y, et al. Research on auto-focusing technology for micro vision system [J]. Optik, 2017, 142 (1): 226-233.
|
[11] |
李金波. 基于机器学习的自动聚焦算法的研究 [D]. 北京: 北京交通大学, 2020.
|
|
Bi C, Hao X, Liu M C, et al. Design and establishment of the machine vision measuring system for film cooling holes [J]. Acta Metrologica Sinica, 2020, 41 (7): 775-780.
|
|
Zhou P, Hu C H, Bi C, et al. Auto focusing technology of three-axis vision measuring system [J]. Infrared and Laser Engineering, 2021, 50 (12):443-450.
|
[13] |
崔恒滔. 基于单目测距原理的自动聚焦拉曼探头 [D]. 上海: 上海交通大学, 2020.
|
|
|
|