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ASUNAM
2009
IEEE
13 years 8 months ago
Automatically Detecting Points of Interest and Social Networks from Tracking Positions of Avatars in a Virtual World
With hundreds of millions of users already today, virtual worlds will become an important factor in tomorrow's media landscape. In a virtual world, users are represented by s...
Frank Kappe, Bilal Zaka, Michael Steurer
UIST
1991
ACM
14 years 2 months ago
On temporal-spatial realism in the virtual reality environment
The Polhemus Isotrak is often used as an orientation and position tracking device in virtual reality environments. When it is used to dynamically determine the user's viewpoi...
Jiandong Liang, Christopher D. Shaw, Mark Green
ICDE
2005
IEEE
183views Database» more  ICDE 2005»
14 years 4 months ago
Protection of Location Privacy using Dummies for Location-based Services
Recently, highly accurate positioning devices enable us to provide various types of location-based services. On the other hand, because position data obtained by such devices incl...
Hidetoshi Kido, Yutaka Yanagisawa, Tetsuji Satoh
ACCV
2006
Springer
14 years 4 months ago
Extrinsic Camera Parameter Estimation Based-on Feature Tracking and GPS Data
Abstract. This paper describes a novel method for estimating extrinsic camera parameters using both feature points on an image sequence and sparse position data acquired by GPS. Ou...
Yuji Yokochi, Sei Ikeda, Tomokazu Sato, Naokazu Yo...
LOCA
2007
Springer
14 years 5 months ago
Inferring Position Knowledge from Location Predicates
Many context- and location-aware applications request high accuracy and availability of positioning systems. In reality however, knowledge about the current position may be incompl...
Jörg Roth
SIGIR
2009
ACM
14 years 5 months ago
Compressing term positions in web indexes
Large search engines process thousands of queries per second on billions of pages, making query processing a major factor in their operating costs. This has led to a lot of resear...
Hao Yan, Shuai Ding, Torsten Suel
ICDE
2007
IEEE
109views Database» more  ICDE 2007»
15 years 7 days ago
Evaluating Proximity Relations Under Uncertainty
For location-based services it is often essential to efficiently process proximity relations among mobile objects, such as to establish whether a group of friends or family member...
Zhengdao Xu, Hans-Arno Jacobsen