NDLI: Mosaicing of medical video-endoscopic images: data quality improvement and algorithm testing

Content Provider	IEEE Xplore Digital Library
Author	Miranda-Luna, R. Hernandez-Mier, Y. Daul, Ch. Blondel, W.C.P.M. Wolf, D.
Copyright Year	2004
Abstract	This conlribution deals with the construction of a cartography of the internal surface of organs based on image sequences acquired during clinical video-endoscopic exams. This paper describes a metrological approach to adapt the images acquisition conditions and the pre-processing tools to the evaluation of our specifically developed registration and mosaicing algorithm. A 3D-micrometric positioning system and an endoscope's tip holding structure was used to acquire sequences of images following a specific protocol. Forty images of a test scene (bladder planar photography) were acquired along a determined displacement looped path. An algorithm for correcting non-linear radial distortion caused by the endoscope was implemented. This algorithm computes projective (camera) and polynomial (distortion) transformations. The optimization process regislers the corrected distorted pattern image with the non-distorted one. Mutual information was used as a measure of similarity and stochastic gradient descent method for optimization. The visual quality of the images was then improved by a shading correction and by removing the optical fibers pattern from the images (specific low-pass filtering). A low-pass filter was used for obtaining the background that is subtracted from every image. The registration algorithm based on mutual inrormation as similarity measure and stochastic gradient descent as optimization method was used to obtain the transformation parameters that were applied to the images for building a mosaic (cartography). Finally, these parameters were applied to a similar sequence of images of a dots pattern (in place of the photography) allowing us to compute significant error parameters for the quality of the mosaicing. The results of the various processes are presented and the evaluation of the performancc of the cartography is discussed.
Starting Page	530
Ending Page	535
File Size	1107681
Page Count	6
File Format	PDF
ISBN	0780385314
DOI	10.1109/ICEEE.2004.1433942
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-08
Publisher Place	Mexico
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Endoscopes Nonlinear distortion Optical distortion Medical tests Fiber nonlinear optics Geometrical optics Optical sensors Nonlinear optics Biomedical imaging Testing
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