NDLI: Camera geolocation from mountain images

Content Provider	IEEE Xplore Digital Library
Author	Yi Chen Gang Qian Gunda, K. Gupta, H. Shafique, K.
Copyright Year	2015
Description	Author affiliation: ObjectVideo, Inc., Reston, VA, USA (Yi Chen; Gang Qian; Gunda, K.; Gupta, H.; Shafique, K.)
Abstract	This paper presents a novel approach to camera geolocation from mountain images. Existing mountain view-based geolocation techniques use only mountain skylines and assume that such skylines are available and can be reliably extracted from query images. However, in real-life scenarios the skyline in a query image may be blurred or invisible, due to occlusions, adverse weather conditions and atmospheric effects, and poor image quality. Geolocating mountain view images with poor skylines is a challenge. In addition, when geolocating a query image, existing techniques do not estimate the camera roll angle, assuming that the roll angle is always small and its impact to the geolocation accuracy is negligible. However, in our research we have observed that even a small camera roll angle of only a few degrees can significantly alter the skyline features extracted from the query image and thus cause geolocation failure due to feature mismatching between the query and feature database. It is another challenge to reliably handle query images with non-negligible camera roll angles. In this paper, we propose a novel solution to these challenges by exploiting additional visual features extracted from mountain ridges beyond skylines and performing search-based camera roll angle estimation. Our proposed approach has been extensively tested on real-world challenging query images from five different regions in three continents. The experimental results from our proposed approach is significantly superior to those obtained from state-of-the-art skyline-based image geolocation approaches.
Starting Page	1587
Ending Page	1596
File Size	1852328
Page Count	10
File Format	PDF
e-ISBN	9780982443866
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	ISIF
Subject Keyword	Cameras Feature extraction Geology Estimation Geospatial analysis Indexes bag-of-words Image geolocation digital elevation model terrain matching
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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