Synchronization of multiple video recordings based on still camera flashes

Authors:
Prarthana Shrestha;Hans Weda;Mauro Barbieri;Dragan Sekulovski
Affiliations:
Philips Research Europe, Eindhoven, The Netherlands;Philips Research Europe, Eindhoven, The Netherlands;Philips Research Europe, Eindhoven, The Netherlands;Philips Research Europe, Eindhoven, The Netherlands
Venue:
MULTIMEDIA '06 Proceedings of the 14th annual ACM international conference on Multimedia
Year:
2006

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Abstract

Combining audiovisual sequences from different cameras requires precise alignment in time. Current synchronization techniques involve using geometrical properties such as camera positions and object features. In this paper, we present a synchronization method based on detecting flashes present in the video content. Such flashes, generated by still cameras, cause a sharp bright frame in the videos. They are detected using an adaptive threshold on luminance variation across the frames. The resulting flash sequences are searched for matches. The matching flashes indicate overlapping content, and allow determining the offset time between cameras. The experimental results from flash detection and flash sequence matching show perfect synchronization in all examined cases.