Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Opto-electronic Engineering》 2005-12
Add to Favorite Get Latest Update

Focusing algorithm for image measurement of object with linear edge

LIU Wen-yao,WANG Bing-zhen ( Key Laboratory of Opto-Electronics Information Science and Technology, Ministry of Education, College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China )  
In view of the focusing-problems in the measurement of images with linear edge, a focusing algorithm based on the gradient information of image edge to be measured is presented. In the evaluating area including the edge to be measured, the algorithm calculates the gray-level gradient of edges for every row or column. According to the property that edge-gradient is maximal in focus, the algorithm takes the average of the gotten gradients as the evaluating criteria of focusing degree. Two common-used focusing algorithms, gray-difference algorithm and gray-variance algorithm, are compared with this algorithm. The test result shows that in the case of same smoothness, the peak value increases by a factor of ten compared with gray-difference algorithm, which overcomes the shortcoming of gray-difference algorithm depending on threshold and makes the smoothness of focusing curve better. The average of local fluctuating range is about tenth of that of gray-difference algorithm.
【CateGory Index】: TP274.4
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
Chinese Journal Full-text Database 1 Hits
1 SHENG Yun,QIN Ya-jie,HONG Zhi-liang ( State Key Lab of ASIC and System, Fudan University, Shanghai 201203, China );Real-time Auto-focusing Algorithm for Digital Video Camera[J];Opto-Electronic Engineering;2008-08
Chinese Journal Full-text Database 3 Hits
1 WANG Ren hua, SHEN Mang zuo (Institute of Optics & Electronics, Chinese Academy of Sciences,Chengdu 610209,China);An Algorithm Study for Automatic Focusing[J];Opto-electronic Engineering;2000-04
2 REN Si-gang, LI Jian-wei, XIE Li-li (Institute of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China);Automatic focusing technique based on gray scale difference method[J];Opto-electronic Engineering;2003-02
3 Wu Zhenfeng Zuo Hongfu Qiu Genliang Liu Hongxing Department of Mechanical Engineering,Nanjing Univ ersity of Aeronautics & Astronautics Nanjing,210016;New Autofocus Algorithm of Microscope[J];JOURNAL OF DATA ACQUISITION & PROCESSING;2000-03
Chinese Journal Full-text Database 10 Hits
1 ZHAO Li,xin,HU Song,WANG Zhao,zhi,LUO Zheng,quan,YAN Wei,HU Xiang,yu(Institute of Optic and Electronics,Chinese Academy of Sciences,Chengdu 610209,China);Auto,Focus of Laser Confocal Biochip Scanning[J];Micronanoelectronic Technology;2006-11
2 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
3 Dong Dai Liu Rong Sun Minglei Zong Guanghua(School of Mechanical Engineering and Automation,Beijing University of Aeronautics and Astronautics,Beijing 100083,China);Auto-focusing algorithm based on cross correlation[J];Journal of Beijing University of Aeronautics and Astronautics;2006-03
4 LIU Huan-yu1,2,XIONG Wen-zhuo1,WAN Qiu-hua1,ZHAO Chang-hai1,2,MU Zhi-guo1,2 (1.Changchun Institute of Optics,Fine Mechanics and Physics,the Chinese Academy of Sciences,Changchun 130033,China;2.Graduate School of the Chinese Academy of Sciences,Beijing 100039,China);Development of Automatic Focusing System Based on Image Processing Method[J];Journal of Test and Measurement Technology;2007-01
5 Zhang Qigui et al;A Design of High Resolution Camera for Video Presenter[J];Computer Development & Applications;2009-04
6 CHENG Yong Qiang,HUANG Ying Nan,XIE Ke Ming (College of Information Engineering, Taiyuan University of Technology, Taiyuan 030024 ,China);A method and hardware implementation of auto-focusing system for the camera[J];Application of Electronic Technique;2009-01
7 TONG Qing-hua, YING Gen-yu, WANG Jian-ru (dept. of Electronics, Tsinghua University, Beijing 1000084, China);Development of Intelligent Measuring System for C PT Purity[J];Journal of Electron Devices;2005-01
8 CAI Chang-jin~ 1,2 ,ZHU Ming~1 1.Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; 2.Graduate School of the Chinese Academy of Sciences, Beijing 100039,China;Auto-Focusing System Based on DSP[J];Chinese Journal of Electron Devices;2007-01
9 PEI Xi-yu, FENG Hua-jun, LI Qi, XU Zhi-hai (State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China);A Depth from Defocus Auto-Focusing Method Based on Frequency Analysis[J];Opto-electronic Engineering;2003-05
10 CUI Ji-wen, TAN Jiu-bin, AO Lei, KANG Wen-jing (Institute of Ultra-precision Optoelectronic Instrument Engineering Harbin Institute of Technology, Harbin 150001,China);Automatic focusing method based on fuzzy control and image processing technique[J];Opto-electronic Engineering;2005-06
China Proceedings of conference Full-text Database 4 Hits
1 YAN Qiuzhen 1,ZHU Shihai 1,ZHANG Weicong 2 1.Department of Computer Science,Zhejiang Water Conservancy and Hydropower College,Hangzhou 310018,China;2.Intelligent Control Technology Institute,Zhejiang Wanli University,Ningbo 315101,China;Research of Auto Focus Technique for Mobile CMOS SoC Image Sensor[A];[C];2007
2 Zong Ya-ning~(1,2) Wang Shan-yuan~2 Wu Xiong-ying~2 1.Zhongyuan University of TechnoLogy,Zhengzhou 450007,China 2.Donghua University,Shanghai 200051,China;The measuring method of animal fibers diameter based on auto-focus technology[A];[C];2006
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 ZHANG Xi-Kun~1 LIU Rui-An~(1,2) HOU Jie~1 LI Wen-Qing~2 (1.Department of Physics and electronic information,Tianjin Normal University,Tianjin 300074,China; 2.University of Science CAUC,Tianjin 300300,China);Automatic Adjusting and Controlling of CCD objective in eye-gaze tracking system[A];[C];2007
Chinese Journal Full-text Database 10 Hits
1 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
2 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
3 LI Qi, FENG Hua-jun, XU Zhi-hai (State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China);Image pre-processing techniques for auto focusing[J];Opto-electronic Engineering;2004-09
4 FU De-gui, WANG Fa-gen, SUN Chao-ming ( The Institute of Mechanics Manufacture Technology, the Academy of Engineering Physics of China, Mianyang 621900, China );Object-oriented automatic focusing of an optical system[J];Opto-electronic Engineering;2005-07
5 YUAN Ke,XU Wei-hong(College of Computer & Communications, Changsha University of Science and Technology, Changsha 410076, China);Assistant camera focusing system based on image definition evaluation[J];Opto-Electronic Engineering;2006-01
6 Feng Huajun (State Key Laboratory of Optical Instruments, Zhejiang University,Hangzhou,310027);The Focusing System with Distance Measuring by the Reflected Energy and Tts Overlapping Design Method[J];OPTO-ELECTRONIC ENGINEERING;1998-02
7 HU Tao~,CHEN Shi-zhe,LIU Guo-dong,PU Zhao-bang(Department of Automatic Measurement and Control,Harbin Institute of Technology,Harbin 150001,China);Algorithm of Rapid Auto-focusing with a Long-range[J];Journal of Optoelectronics.laser;2006-04
8 ZHOU Xian,JIANG Wei(School of Information Science and Engineering,Shandong University,Jinan 250100,China);Auto-focus algorithm based on image edge energy[J];Optical Technique;2006-02
9 Li Qi,Xu Zhihai,Feng Huajun,Dai Shunlin,Bian Meijuan State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,Hangzhou 310027;AUTOFOCUS AREA DESIGN OF DIGITAL IMAGING SYSTEM[J];Acta Photonica Sinica;2002-01
10 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
【Secondary Citations】
Chinese Journal Full-text Database 8 Hits
1 WANG Li-qiang, LIN Bin, XU Xiang-dong, LU Zu-kang (China National Optical Instrument Engineering Research Center, Zhejiang University, Hangzhou 310027, China);An Automatic Focusing System Based on USB Video Camera[J];Opto-electronic Engineering;2001-05
2 WU Xiao Bo (Dept.of Automation of Logistical Engineering University,Chongqing 400041);Analyzing of the Characteristic of Image Edge[J];OPTICS AND PRECISION ENGINEERING;1999-01
3 WANG Jian min 1, PU Zao bang 2, YIN Ji xue 3, YAN Lei 1 (1. Beijing University, Beijing 100871, China; 2. Harbin Institute of Technology, Harbin 150001, China) (3. Beijing Institute of Techndogy, Beijing 10081, China);Study on image autofocusing and aiming of microscopic system[J];OPTICAL TECHNOLOGY;2000-05
4 WU Zhenfeng ZUO Hongfu QIU Genliang (Department of Mechanical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016);Autofocus technique of optical microscope[J];OPTICAL INSTRUMENTS;2000-04
5 Huang Jianqi,Feng Huajun,Xu Zhihai,Dai Shunlin,L i Qi,Bian Meijuan State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,H angzhou,3 1 0 0 2 7;THE APPLICATION OF EDGE-ENHANCE ALGORITHM AND WAVELET ANALYSISIN AUTO-FOCUS[J];ACTA PHOTONICA SINICA;2000-10
6 Gan Minliang(Civil Aviation College, NUAA Nanjing,210016)Liu Yuping(Department of Power Engineering, NUAA Nanjing,210016);Implementation of Automatic ImageAcquisition with a Microscope[J];JOURNAL OF NANJING UNIVERSITY OF AERONAUTICS & ASTRONAUTICS;1998-02
8 Xu Dingjie,Wang Xiaoxi,Wang Wuyi and Yuan Zhejun Harbin University of Industry,Harbin 150001.;The Application of Digital Image Processing in the Measurement of Focal Distance[J];INSTRUMENT TECHNIQUE AND SENSOR;1998-07
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved