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Automatically characterizing places with opportunistic crowdsensing using smartphones

Published: 05 September 2012 Publication History

Abstract

Automated and scalable approaches for understanding the semantics of places are critical to improving both existing and emerging mobile services. In this paper, we present CrowdSense@Place (CSP), a framework that exploits a previously untapped resource -- opportunistically captured images and audio clips from smartphones -- to link place visits with place categories (e.g., store, restaurant). CSP combines signals based on location and user trajectories (using WiFi/GPS) along with various visual and audio place "hints" mined from opportunistic sensor data. Place hints include words spoken by people, text written on signs or objects recognized in the environment. We evaluate CSP with a seven-week, 36-user experiment involving 1,241 places in five locations around the world. Our results show that CSP can classify places into a variety of categories with an overall accuracy of 69%, outperforming currently available alternative solutions.

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      cover image ACM Conferences
      UbiComp '12: Proceedings of the 2012 ACM Conference on Ubiquitous Computing
      September 2012
      1268 pages
      ISBN:9781450312240
      DOI:10.1145/2370216
      Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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      Published: 05 September 2012

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      Author Tags

      1. crowdsourcing
      2. location-based services
      3. semantic location
      4. smartphone sensing

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      Ubicomp '12
      Ubicomp '12: The 2012 ACM Conference on Ubiquitous Computing
      September 5 - 8, 2012
      Pennsylvania, Pittsburgh

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      UbiComp '12 Paper Acceptance Rate 58 of 301 submissions, 19%;
      Overall Acceptance Rate 764 of 2,912 submissions, 26%

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