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《Opto-electronic Engineering》 2004-10
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An auto-focusing system used for digital imaging

FENG Hua-jun , MAO Bang-fu , LI Qi , XU Zhi-hai (State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China)  
An auto-focusing system used for digital imaging is proposed. The system, for the purpose of accurate auto-focusing, make use of CMOS as image sensor, Digital Signal Processor (DSP) for data processing and controlling driving circuit for lens position adjustment. The auto-focusing is achieved by means of Depth From Focus (DFF), through which, a series of images with different fuzzy degrees are obtained through changing lens positions and a focusing evaluation curve is formed through calculating the definition evaluation for each image. The image definition is evaluated through using gradient function as evaluation standard. The interested focusing range is controlled by window selection. This measure reduces the load for data processing. Test for the experimental camera shows that the system has good automatic focusing behavior and can solve the problem of blind window. In this way targets behind glass window can still be focused correctly.
【Fund】: 国家教委高等学校骨干教师资助计划项目
【CateGory Index】: TB852
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【References】
Chinese Journal Full-text Database 6 Hits
1 LIANG Cui-ping~(1,2),LI Qing-an~(1,2),QIAO Yanfeng~1,ZHU Wei~1(1.Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Science,Changchun 130033,China; 2.Graduate School of Chinese Academy Science,Beijing 100039,China);On auto-focusing technology of optical system[J];Electronics Optics & Control;2006-06
2 HOU Wen-jun,LI Yang,DU Si-dan ( Department of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China );Auto-focusing Algorithm for Iris Imaging System[J];Opto-Electronic Engineering;2008-06
3 XU Jia-jun~1,CHEN Yan-ping~ 2,YU Fei-hong ~2(1.Zhejiang Sunny Group Co.Ltd.,Yuyao 315400,China;2.State Key Laboratorn of Moderh Optical Instrumentation,Zhejiang University,Hangzhou 310027,China);Auto-focusing technique used for camera module production line[J];Optical Instruments;2006-03
4 LIANG Min-hua1,2,WU Zhi-yong1, CHEN Tao1(1.Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130022,China;2.Graduate University of Chinese Academy of Sciences, Beijing 10039,China);Auto-focusing adjustment of theodolites by largest the gradient method[J];Optics and Precision Engineering;2009-12
5 Ni Jun1 Yuan Jiahu2 Wu Qinzhang21College of Optical and Electronic Technology,China Jiliang University,Hangzhou,Zhejiang 310018,China2Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu,Sichuan 610209,China;Identification for Optical Image Definition Based on Edge Feature[J];Chinese Journal of Lasers;2009-01
6 GUO Tong-jian,LIN Zhao-hua,DU Bi-xiu(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China);Design of Touch-LCD Interface in Image Focusing System Based on OMAP Processor[J];Chinese Journal of Liquid Crystals and Displays;2010-01
【Citations】
Chinese Journal Full-text Database 4 Hits
1 TIAN Yibin1,2, XU Zhihai1, FENG Huajun1, WANG Lin1, LI Qi1, DAI Shunlin1027, China)(2. Hangzhou Sunyard System Engineering Co. Ltd, Hangzhou310012, China);Pupil-controlled auto-focusing technique used in digital cameras[J];Optical Technology;2003-01
2 Li Qi,Feng Huajun,Xu Zhihai,Bian Meijuan,Shen Su,Dai Ruichun * State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,Hangzhou,China 310027 Shanghai No.1 Research Institute of Zhongxing Telecommunication Corp,Shanghai,China 200231;DIGITAL IMAGE SHARPNESS EVALUATION FUNCTION[J];Acta Photonica Sinica;2002-06
3 Tian Yibin 1,3,,Xu Zhihai 1,Feng Huajun 1,Dai Ruichun2, Dai Shunlin1,Li Qi1,Bian Meijuan1 1 National Lab of Modern Optical Instrument, Zhejiang University, Hangzhou 310027 2 Shanghai No.1 Research Institute, Zhongxing Telecom, Shanghai 200231,China 3 Department of Vision Science, University of California, Berkeley, CA 94720,USA;Auto-focus Based on Skin Detection[J];Acta Photonica Sinica;2003-01
4 Li Qi,Feng Huajun,Xu Zhihai State Key Lab of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China;Autofocus System Experiment Study Using Variational Image-sampling[J];Acta Photonica Sinica;2003-12
【Co-citations】
Chinese Journal Full-text Database 10 Hits
1 ZHANG Chun-mei1,YU Yong2 (1.The Institute of Optics & Electronics,Chinese Academy of Sciences,Chengdu 610209,China; 2.Huawei Technology Limited Company,Shenzhen 518129,China);Development of Image Measurement System Based on Panel CCD for Cutting Tools[J];Micronanoelectronic Technology;2007-02
2 YU Dong, LI Xiao-ying, Lü Nai-guang, DENG Wen-yi(Department of Electronic Information Engineering,Beijing Institute of Machinery,Beijing 100085,China);The Auto-focus technique for digital MTF measurement system[J];Journal of Beijing Institute of Machinery;2004-04
3 LIU Zhu-hua~1,ZOU Dao-wen~2,DENG Cheng-zhi~1,WANG Sheng-qian~2,XIONG Xiao-hua~1 niversity, 330027,China; 2.Jingxi Science & Technology Normal College, Applied Physics Department, Nanchang, 330013,China);A Non-linear Filter De-noising Algorithm for Images Based on Discrete Fourier Transform[J];Journal of Jiangxi Normal University (Natural Sciences Edition);2004-03
4 WANG Xin,AN Zhiyong,YANG Ruining(Changchun University of Science and Technology,The School of Photo-electronic Engineering,Changchun 130022);The Research of CCD Camera Auto-focusing Technology Based on Image Definition Criterion[J];Journal of Changchun University of Science and Technology(Natural Science Edition);2008-01
5 ZHAI Wenshuai,ZHANG Yunhua (Center for Space Science and Applied Research,Chinese Academy of Sciences,Beijing 100080,China);A New Method for Doppler-Ambiguity-Number Estimation in Spaceborne SAR Imaging[J];Journal of Test and Measurement Technology;2008-03
6 LIANG Cui-ping~(1,2),LI Qing-an~(1,2),QIAO Yanfeng~1,ZHU Wei~1(1.Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Science,Changchun 130033,China; 2.Graduate School of Chinese Academy Science,Beijing 100039,China);On auto-focusing technology of optical system[J];Electronics Optics & Control;2006-06
7 ZHANG Wen Ai,LI Feng Lei,CHENG Yong Qiang (College of Information Engineering of TUT,Taiyuan 030024,China);The implementation of step-motor drive and auto-focus based on FPGA[J];Application of Electronic Technique;2008-05
8 HOU Wen-jun,LI Yang,DU Si-dan ( Department of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China );Auto-focusing Algorithm for Iris Imaging System[J];Opto-Electronic Engineering;2008-06
9 WANG Qian,SONG En-min,XU Xiang-yang,LIU Hong(School of Computer Science and Technology,Huazhong University of Science and Technology,Wuhan 430074,China);Auto-focusing function for microscope image based on weighted neighborhood correlation[J];Optics and Precision Engineering;2008-01
10 ZHU Kong-feng,JIANG Wei,WANG Duan-fang,ZHOU Xian,ZHANG Jin(College of Information Science and Engineering,Shangdong University,Jinan 250100,China);Using Gaussian unequally spaced sampling to make automatic focusing result correct[J];Optical Technique;2005-06
China Proceedings of conference Full-text Database 10 Hits
1 ;The Problem of Depth of Field about 3-D Measurement System for The Contour of Object Surface[A];[C];2005
2 Li Yangchao Xiong Xianming (Eletronic Engineering Department,Guilin University of Electronic Technology,Guilin 541004,China);Design of auto-focusing system based on embedded[A];[C];2007
3 Zhang Hongjian1,2 Tian Weijian1,2 Zhang Wei1,2 Wang Li1,2 (1 Xi’an Institute of Optical and Precision mechanics of CAS Xi’an 710068) (2 Graduate School of the Chinese Academy Sciences Beijing 100039);Auto-focusing Method Based on Operator Fusion in the System for Coupling Optical-taper with CCD[A];[C];2004
4 Feng Huajun, Li Qi, Xu Zhihai State Key Lab of Modern Optical Instrumentation Zhejiang University, Hangzhou, 310027;Auto-Focus technique in digital imaging systems[A];[C];2004
5 LI Yang-chao, XIONG Xian-ming, YI Xi-peng Guilin University of Electronic Technology, Eletronic Engineering Department, Guilin, Guangxi 541004;Study on optical auto-focusing system[A];[C];2006
6 Xu Liqun, Ye Zi, Wu Jianping, Yan Xinxin and Yu Feihong* State Key Laboratory of Modern Optical Instrumentation, Optical Engineering Department, Zhejiang University, Hangzhou, P R China;Microscope Auto-focusing System with the Self-adaptive Mountain-climbing Search Method based on PC Control[A];[C];2007
7 CHENG Xiao-gang~1,CHEN Qi-mei~1,LIU Guo-qing~2 (1.Electronic Science and Engineering Department,Nanjing University,Nanjing 210093,China; 2.Science School,Nanjing University of Technology,Nanjing 210009,China);The Relation Between Total Bounded Variation and Image Definition Detection[A];[C];2009
8 WANG Zheng-you~(1,2) XIAO Wen~1 YE Xiao-qin~1 FAN Bing-yu~1 (1.School of Information Technology,Jiangxi University of Finance & Economics,Nanchang,330013) (2.Key Laboratory of High-Performance Computing Technology,Jiangxi Province,Nanchang,330022);No-Reference Evaluation of Digital Image Definition Based On Edge Kurtosis[A];[C];2006
9 Ma Zheng Luo Li (School of Communication and Information Engineering University of Electronic Science and Technology of China Chengdu 610054 China);Research on Real-time Iris Image Quality Evaluation[A];[C];2008
10 Li Yongtao~(1,2) Han Li~1 (1 Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China; 2 Graduate School of Chinese Academy of Sciences Beijing 100039 China);SEM Autofocus Technology Based on Wavelet Transform[A];[C];2008
【Co-references】
Chinese Journal Full-text Database 10 Hits
1 HUO Zhen TANG Shicai (Chongqing Institute of Posts and Telecommunications,Chongqing 400065,CHN);Position sensitive detectors[J];SEMICONDUCTOR OPTOELECTRONICS;1998-01
2 Sun Xianyi\ An Weirong\ Wang Zhixiao\ Ren Hongzhong (Department of Computer Science, Northern Jiaotong University, Beijing 100044);The Fourfold-Frequency Direction-Judgment Circuit for Improving the Grating Measuring Accuracy[J];JOURNAL OF NORTHERN JIAOTONG UNIVERSITY;1996-06
3 Zhu Shiping Fang Jiancheng Zhou Rui (Beijing University of Aeronautics and Astronautics,School of Astronautics);New Kind of Energy Spectrum Entropy Image Focusing Evaluation Function[J];JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS;1999-06
4 Sun Minglei Zong Guanghua Yu Zhiwei Bi Shusheng Yu Jingjun (School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China);Automatic focusing system of micro-vision based on image analysis[J];Journal of Beijing University of Aeronautics and Astronautics;2005-02
5 SUN Hui , ZHAO Hong(Xi'an Jiaotong University, Xi'an 710049, China);Automatic Detection System for Printing Defects on the Medicine Package[J];Packaging Engineering;2004-01
6 Ren Si-gang, Xie Li-li (College of Optoelectronic Engineering of Chongqing University, Chongqing 400044,China);Application of Autofocus in the Measurement of Image[J];Journal of Chongqing University of Posts and Telecommunications;2002-03
7 XIONG Xing-hua (Xi'an Research Institute of Surveying and Mapping, Xi' an 710054, China);Digital image quality assessment[J];Science of Surveying and Mapping;2004-01
8 Shi Jingzhuo Xu Dianguo Wang Zongpei(Harbin Institute of Technology 150001 China);Stepping Motor Position Servo System with Fuzzy Control[J];Transactions of China Electrotechnical Society;2001-03
9 Huang Meizhen 1,2 Tang Jiuyao 1 Chen Yuqing 1 Cao Xiangqun 1 (National Research Center of Engineering & Technology for Optical Instrumentation, Zhejiang University, Hangzhou 310027) 1 (Electronic Science & Applied Physics Department, Fuzho;Analytic Study of the Photoelectric Characteristic for One Dimensional Position Sensitive Detectors (1-D PSDs)[J];Electronics Optics & Control;2000-04
10 LIANG Cui-ping~(1,2),LI Qing-an~(1,2),QIAO Yanfeng~1,ZHU Wei~1(1.Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Science,Changchun 130033,China; 2.Graduate School of Chinese Academy Science,Beijing 100039,China);On auto-focusing technology of optical system[J];Electronics Optics & Control;2006-06
【Secondary References】
Chinese Journal Full-text Database 7 Hits
1 ZHANG Wen Ai,LI Feng Lei,CHENG Yong Qiang (College of Information Engineering of TUT,Taiyuan 030024,China);The implementation of step-motor drive and auto-focus based on FPGA[J];Application of Electronic Technique;2008-05
2 MA Jin-tao,CHEN Rui,LIN Xi-rong(Graduate School at Shenzhen,Tsinghua University,Guangdong Shenzhen 518055,China);Auto Focusing Method Based on Dispersion Circle Used in Iris Image Acquisition[J];Video Engineering;2009-S2
3 WANG Chao-su1,YANG Ming1,2,DING Hai-bo2(1.Faculty of Information Science and Engineering,Ningbo University,Ningbo 315211,China;2.Ningbo Yongxin Optical Co.LTD,Ningbo 315040,China);A Method of Microscope Auto-focus Based on Video Signal Processing[J];Journal of Ningbo University(Natural Science & Engineering Edition);2008-01
4 (Changchun Institude of optics,fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,china) LI Hong-wen;The circuit implementation of the multifunction focus and light adjustment system[J];Microcomputer Information;2009-11
5 Fan Xiang,Lu Dao-hua,Wang Jia(School of Mechanical and Power Eng.,Jiangshu University of Science andTechnology,Zhenjiang 212003,Jiangsu,CHN);Research and application of machine vision in industry[J];Modern Manufacturing Engineering;2007-06
6 ZHUANG Zhen-feng (Department of Mechanical and Automation Engineering,Zhangzhou Institute of Technology,Zhangzhou 363000,China);The lens design of mobile camera phone[J];Journal of Zhangzhou Institute of Technology;2010-01
7 Zhou Yi Wu Guo-Song Dai Wei Li Hong-Bo Wang Ai-Ying(Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China);Accurate determination of optical constants and thickness of absorbing thin films by a combined ellipsometry and spectrophotometry approach[J];Acta Physica Sinica;2010-04
【Secondary Citations】
Chinese Journal Full-text Database 1 Hits
1 HUANG Jian qi, XU Zhi hai, FENG Hua jun DAI Shun lin, LI Qi, BIAN Mei juan (State Key Laboratory of Modern Optical Instrument, Zhejiang University, Hangzhou 310027, China);The Application of Space Variable Resolution to Automatic Focusing[J];Opto-electronic Engineering;2001-01
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