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Who's Time Is It Anyway?: Investigating the Accuracy of Camera Timestamps

Published: 03 November 2014 Publication History

Abstract

People take photos all over the world at all times of day; each photo depicting a place and a moment worth capturing. In the context of multimedia analysis and social computing, accurate location and time information about where and when these photos were taken is of importance for understanding event semantics, image content and many other purposes. While location information associated with photos is known to be relatively accurate, time is not. From a sample of 10 million public Flickr photos, we observe that 37% of the photos differ more than an hour between their camera timestamps and GPS timestamps with respect to local time at the locations where the photos were taken. Erroneous time information may adversely influence the correctness of any kind of temporal analysis that relies on camera timestamps, as well as research and real-world applications that require accurate knowledge of when and where photos were captured. In light of our observations we propose a simple yet effective metadata-only technique for improving the accuracy of camera timestamps.

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Cited By

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  • (2020)Social Media and Open Data to Quantify the Effects of Noise on HealthFrontiers in Sustainable Cities10.3389/frsc.2020.000412Online publication date: 2-Sep-2020
  • (2016)The 32 Days of ChristmasProceedings of the 2016 CHI Conference on Human Factors in Computing Systems10.1145/2858036.2858255(5710-5714)Online publication date: 7-May-2016
  • (2015)Real-time Analysis and Visualization of the YFCC100m DatasetProceedings of the 2015 Workshop on Community-Organized Multimodal Mining: Opportunities for Novel Solutions10.1145/2814815.2814820(25-30)Online publication date: 30-Oct-2015
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    cover image ACM Conferences
    MM '14: Proceedings of the 22nd ACM international conference on Multimedia
    November 2014
    1310 pages
    ISBN:9781450330633
    DOI:10.1145/2647868
    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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    New York, NY, United States

    Publication History

    Published: 03 November 2014

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    Author Tags

    1. georeferenced photos
    2. gps information
    3. time accuracy

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    MM '14
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    MM '14: 2014 ACM Multimedia Conference
    November 3 - 7, 2014
    Florida, Orlando, USA

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    MM '14 Paper Acceptance Rate 55 of 286 submissions, 19%;
    Overall Acceptance Rate 2,145 of 8,556 submissions, 25%

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    Cited By

    View all
    • (2020)Social Media and Open Data to Quantify the Effects of Noise on HealthFrontiers in Sustainable Cities10.3389/frsc.2020.000412Online publication date: 2-Sep-2020
    • (2016)The 32 Days of ChristmasProceedings of the 2016 CHI Conference on Human Factors in Computing Systems10.1145/2858036.2858255(5710-5714)Online publication date: 7-May-2016
    • (2015)Real-time Analysis and Visualization of the YFCC100m DatasetProceedings of the 2015 Workshop on Community-Organized Multimodal Mining: Opportunities for Novel Solutions10.1145/2814815.2814820(25-30)Online publication date: 30-Oct-2015
    • (2015)The Digital Life of Walkable StreetsProceedings of the 24th International Conference on World Wide Web10.1145/2736277.2741631(875-884)Online publication date: 18-May-2015
    • (2015)On the Accuracy of Hyper-local Geotagging of Social Media ContentProceedings of the Eighth ACM International Conference on Web Search and Data Mining10.1145/2684822.2685296(127-136)Online publication date: 2-Feb-2015

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