应用于大变倍监控摄像机的电动变焦跟踪
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摘要
为了保持数字高清监控摄像机在大倍率电动变焦过程中的图像清晰度水平,提出一种新的电动变焦跟踪方法。该方法根据事先采集的若干条变焦曲线,利用几何法构造置信区间。以置信区间为变焦跟踪曲线的中心位置并且自适应地调整置信区间的位置,从而动态地修正变焦跟踪曲线。在18×数字高清摄像机中实现了该方法,实验结果显示:变焦过程中对焦电机的调节位置相对于最佳位置的平均偏离水平不大于0.018 75mm;变焦全程时间平均为4.1s。
In order to ensure the image clarity of the high-definition surveillance cameras in the large-range zooming process,a new zoom tracking method was presented.In this method,confidence interval was constructed by geometric method according to several zoom trace curves which were collected in advance;Zoom tracking curve was determined by the center position of confidence interval,and it's dynamically adjusted with the adaptively adjusted confidence interval.This method was realized in an 18×digital high-definition surveillance camera.Experimental results indicate that the average bias of the focus motor's position relative to its best position is less than 0.018 75 mm and the average time of zooming from wide-angle to tel-angle is 4.1s.
In order to ensure the image clarity of the high-definition surveillance cameras in the large-range zooming process,a new zoom tracking method was presented.In this method,confidence interval was constructed by geometric method according to several zoom trace curves which were collected in advance;Zoom tracking curve was determined by the center position of confidence interval,and it's dynamically adjusted with the adaptively adjusted confidence interval.This method was realized in an 18×digital high-definition surveillance camera.Experimental results indicate that the average bias of the focus motor's position relative to its best position is less than 0.018 75 mm and the average time of zooming from wide-angle to tel-angle is 4.1s.
引文
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[15]Lin Zhong,Huang Chenrong,Liu Tianshi.Motorized zoom lens’s motor origin correction method based on zoom tracking curve[J].Opto-Electronic Engineering,2014,41(12):88-94.林忠,黄陈蓉,刘天石.应用变焦曲线校正电动变焦镜头的电机原点[J].光电工程,2014,41(12):88-94.
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[17]He Jie,Zhou Rongzhen,Hong Zhiliang.Modified fast climbing search auto-focus algorithm with adaptive step size searching technique for digital camera[J].Consumer Electronics,IEEE Transactions on,2003,49(2):257-262.
[18]Mclean I S.Electronic imaging in astronomy:detectors and instrumentation[M].Germany:Springer Berlin Heidelberg,2008.
[19]Huang Detian.Study on auto-focusing method using image technology[D].Beijing:University of the Chinese Academy of Sciences,2013.黄德天.基于图像技术的自动调焦方法研究[D].北京:中国科学院大学,2013.
[2]Zhang Laixian,Sun Huayan,Guo Huichao,et al.Auto focusing algorithm based on largest gray gradient summation[J].Acta Photonica Sinica,2013,42(5):605-610.张来线,孙华燕,郭惠超,等.基于图像灰度梯度最大值累加的自动调焦算法[J].光子学报,2013,42(5):605-610.
[3]Zhang Yihui,Zhao Zhiqiang.Curvature radius testing of optical lens based on autofocusing technology[J].Journal of Applied Optics,2012,33(4):931-935.张亦慧,赵志强.基于自动对焦技术的透镜曲率半径检测[J].应用光学,2012,33(4):931-935.
[4]Ma Jianshe,Li Heying,Cheng Xuemin,et al.Control system for embedded auto-focusing camera module[J].Opt.Precision Eng.,2012,20(10):2222-2228.马建设,李合银,程雪岷,等.嵌入式自动聚焦摄像模组控制系统的设计[J].光学精密工程,2012,20(10):2222-2228.
[5]Chen Fang,Zhang Cunji,Han Yanxiang,et al.Fast focus on simple images[J].Optics Precision Enginerring,2014,22(1):220-227.陈芳,张存继,韩延祥,等.简单图像的快速聚焦[J].光学精密工程,2014,22(1):220-227.
[6]Li Huiguang,Wang Shuai,Sha Xiaoou,et al.Study of auto focusing technique of micro-vision system[J].Opto-Electronic Engineering,2014,41(8):1-9.李慧光,王帅,沙晓鹏,等.显微视觉系统中自动聚焦技术的研究[J].光电工程,2014,41(8):1-9.
[7]Luo Jun,Sun Li,Min Zhisheng.Application of zoom tracking curves in focusing[J].Optics Precision Enginerring,2011,19(10):2326-2332.罗钧,孙力,闵志盛.变焦曲线在对焦中的应用[J].光学精密工程,2011,19(10):2326-2332.
[8]Hoad P,Illingworth J.Automatic control of camera pan,zoom and focus for improving object recognition[C].USA:IEEE,1995:291-295.
[9]Peddigari V,Kehtarnavaz N,Lee Sangyong,et al.Real-time implementation of zoom tracking on TI DM processor[C].USA:International Society for Optics and Photonics,2005:8-18.
[10]Lee J S,Ko S J,Yoon K,et al.A video camera system with adaptive zoom tracking[C].USA:IEEE,2002:56-57.
[11]Peddigari V,Kehtarnavaz N.A relational approach to zoom tracking for digital still cameras[J].IEEE Transactions on Consumer Electronics,2005,51(4):1051-1059.
[12]Peddigari V,Kehtarnavaz N.Real-time predictive zoom tracking for digital still cameras[J].Journal of Real-time Image Processing,2007,2(1):45-54.
[13]Zou Tengyue,Tang Xiaoqi,Song Bao,et al.Robust feedback zoom tracking for digital video surveillance[J].Sensors,2012,12(6):8073-8099.
[14]Hu Jixian.38×zoom ratio wideband TV lens optics[J].Journal of Applied Optics,2011,32(5):845-848.胡际先.38×变倍比宽波段电视镜头光学系统设计[J].应用光学,2011,32(5):845-848.
[15]Lin Zhong,Huang Chenrong,Liu Tianshi.Motorized zoom lens’s motor origin correction method based on zoom tracking curve[J].Opto-Electronic Engineering,2014,41(12):88-94.林忠,黄陈蓉,刘天石.应用变焦曲线校正电动变焦镜头的电机原点[J].光电工程,2014,41(12):88-94.
[16]Tenenbaum J M.Accommodation in computer vision[D].Stanford:Stanford University,1970.
[17]He Jie,Zhou Rongzhen,Hong Zhiliang.Modified fast climbing search auto-focus algorithm with adaptive step size searching technique for digital camera[J].Consumer Electronics,IEEE Transactions on,2003,49(2):257-262.
[18]Mclean I S.Electronic imaging in astronomy:detectors and instrumentation[M].Germany:Springer Berlin Heidelberg,2008.
[19]Huang Detian.Study on auto-focusing method using image technology[D].Beijing:University of the Chinese Academy of Sciences,2013.黄德天.基于图像技术的自动调焦方法研究[D].北京:中国科学院大学,2013.