RollingLight: Enabling line-of-sight light-to-camera communications

Hui Yu Lee, Hao Min Lin, Yu Lin Wei, Hsin I. Wu, Hsin Mu Tsai, Ching-Ju Lin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

71 Scopus citations

Abstract

Recent literatures have demonstrated the feasibility and applicability of light-to-camera communications. They either use this new technology to realize specific applications, e.g., localization, by sending repetitive signal patterns, or consider non-line-of-sight scenarios. We however notice that line-of-sight light-to-camera communications has a great potential because it provides a natural way to enable visual association, i.e., visually associating the received information with the transmitter's identity. Such capability benefits broader applications, such as augmented reality, advertising, and driver assistance systems. Hence, this paper designs, implements, and evaluates RollingLight, a line-of-sight light-to-camera communication system that enables a light to talk to diverse off-the-shelf rolling shutter cameras. To boost the data rate and enhance reliability, RollingLight addresses the following practical challenges. First, its demodulation algorithm allows cameras with heterogeneous sampling rates to accurately decode high-order frequency modulation in real-time. Second, it incorporates a number of designs to resolve the issues caused by inherently unsynchronized light-to-camera channels. We have built a prototype of Rolling- Light with USRP-N200, and also implemented a real system with Arduino Mega 2560, both tested with a range of different camera receivers. We also implement a real iOS application to examine our real-time decoding capability. The experimental results show that, even to serve commodity cameras with a large variety of frame rates, RollingLight can still deliver a throughput of 11.32 bytes per second. Copyright is held by the owner/author(s).

Original languageEnglish
Title of host publicationMobiSys 2015 - Proceedings of the 13th Annual International Conference on Mobile Systems, Applications, and Services
PublisherAssociation for Computing Machinery, Inc
Pages167-180
Number of pages14
ISBN (Electronic)9781450334945
DOIs
StatePublished - 18 May 2015
Event13th Annual International Conference on Mobile Systems, Applications, and Services, MobiSys 2015 - Florence, Italy
Duration: 18 May 201522 May 2015

Publication series

NameMobiSys 2015 - Proceedings of the 13th Annual International Conference on Mobile Systems, Applications, and Services

Conference

Conference13th Annual International Conference on Mobile Systems, Applications, and Services, MobiSys 2015
CountryItaly
CityFlorence
Period18/05/1522/05/15

Keywords

  • Camera Communications
  • Frequency Shift Keying
  • Rolling Shutter
  • Smartphones
  • Visible Light Communications

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  • Cite this

    Lee, H. Y., Lin, H. M., Wei, Y. L., Wu, H. I., Tsai, H. M., & Lin, C-J. (2015). RollingLight: Enabling line-of-sight light-to-camera communications. In MobiSys 2015 - Proceedings of the 13th Annual International Conference on Mobile Systems, Applications, and Services (pp. 167-180). (MobiSys 2015 - Proceedings of the 13th Annual International Conference on Mobile Systems, Applications, and Services). Association for Computing Machinery, Inc. https://doi.org/10.1145/2742647.2742651