Image sharpness function based on edge feature

Image sharpness function based on edge feature
Image sharpness function based on edge feature

Image sharpness function based on edge feature
Accession number:20100212632964
Title:Image sharpness function based on edge feature
Authors:Jun,Ni.1
Author affiliation:1 College of Optical and Electronic Technology,China Jiliang University Hangzhou,Zhejiang 310018,China
Corresponding author:Jun,N.(njun11642@126.com)
Source title:Proceedings of SPIE - The International Society for Optical Engineering
Abbreviated source title:Proc SPIE Int Soc Opt Eng
Volume:7513
Monograph title:2009 International Conference on Optical Instruments and Technology - Optoelectronic Imaging and Process Technology,OIT 2009
Issue date:2009
Publication year:2009
Article number:75131A
Language:English
ISSN:0277786X
CODEN:PSISDG
ISBN-13:9780819478993
Document type:Conference article (CA)
Conference name:2009 International Conference on Optical Instruments and Technology,OIT 2009
Conference date:October 19,2009 - October 21,2009
Conference location:Shanghai,China
Conference code:79094
Sponsor:China Instrument and Control Society (CIS); Chinese Optical Society (COS); The International Society for Optical Engineering (SPIE)
Publisher:SPIE,P.O.Box 10,Bellingham WA,WA 98227-0010,United States
Abstract:Autofocus technique has been widely used in optical tracking and measure system,but it has problem that when the autofocus device should to work.So,no-reference image sharpness assessment has become an important issue.A new Sharpness Function that can estimate current frame image be in focus or not is proposed in this paper.According to current image whether in focus or not and choose the time of auto focus automatism.The algorithm measures object typical edge and edge direction,and then get image local kurtosis information to determine the degree of image sharpness.It firstly select several grads points cross the edge line,secondly calculates edge sharpness value and get the cure of the kurtosis,according the measure precision of optical-equipment,a threshold value will be set beforehand.If edge kurtosis value is more than threshold,it can conclude current frame image is in focus.Otherwise,it is out of focus.If image is out of focus,optics system then takes autofocus program.This algorithm test several thousands of digital images captured from optical tracking and measure system.The results show high correlation with subjective sharpness assessment for s images of sky object.© 2009 SPIE.
Number of references:8
Main heading:Edge detection
Controlled terms:Image quality - Imaging systems - Optical data processing - Optical instruments
Uncontrolled terms:Auto-focus - Autofocus techniques - Automatic focusing - Current frame - Current image - Digital image - Edge direction - Edge feature - Edge features - Edge lines - Edge sharpness - Image sharpness - Measure precision - No references - Optical tracking - Optics systems - Out-of-focus - Sharpness function
Classification code:941.3 Optical Instruments - 751.1 Acoustic Waves - 746 Imaging Techniques - 741.3 Optical Devices and Systems - 741.1 Light/Optics - 741 Light,Optics and Optical Devices - 723.5 Computer Applications - 723.2 Data Processing and Image Processing - 716 Telecommunication; Radar,Radio and Television
DOI:10.1117/12.837678
Database:Compendex
Compilation and indexing terms,© 2010 Elsevier Inc.