NDLI: Experiments with an automated visual inspection system

Content Provider	IEEE Xplore Digital Library
Author	Chalfont, E.C. Bon, B. Kim, W.S.
Copyright Year	1997
Description	Author affiliation: Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA (Chalfont, E.C.)
Abstract	Experiments were performed with the JPL automated visual inspection system that detects potential flaws in the exterior of the Space Station by comparing reference and comparison images. The imaging system consists of cameras, strobe lights, an image processor, and a simulated sunlight source. Two color CCD cameras with electronic shuttering (Toshiba IK-M41A) and two strobe lights (EG&G MVS5000) are mounted on the end of a seven DOF Robotics Research Corporation arm as part of an integrated multi-sensor end effector. The entire robot arm is mounted on a l DOF mobile rail platform. Three main components evaluated are: 1) image-differencing-based ambient light compensation, 2) electronic-shuttering-based ambient light rejection, and 3) image registration. The results indicate that the ambient light compensation algorithm yields 0.01% to 0.4% false flaws with lab-simulated sunlight changing front 25%; to 100% intensity. Electronic shuttering with synchronized strobe lighting reduces false flaws considerably. As exposure shortens from 1/60 (fully open) to 1/1000 second, false flaws decrease 100-fold from 0.4% to 0.004%. The current registration algorithm corrects a very limited range of misregistration, correcting approximately 4 pixels of pure translational shifts over the inspection surface. A more robust image registration algorithm that can correct both translational and rotational shifts over 10 pixels misregistration would be highly desirable.
Starting Page	965
Ending Page	970
File Size	1294638
Page Count	6
File Format	PDF
ISBN	0780341600
DOI	10.1109/ICAR.1997.620298
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-07-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inspection Robot vision systems Cameras Image registration Space stations Charge coupled devices Charge-coupled image sensors Orbital robotics End effectors Mobile robots
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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