Watermarked Movie Soundtrack Finds the Position of the Camcorder in a Theater

In recent years, the problem of camcorder piracy in theaters has become more serious due to technical advances in camcorders. In this paper, as a new deterrent to camcorder piracy, we propose a system for estimating the recording position from which a camcorder recording is made. The system is based...

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Bibliographic Details
Published in:IEEE transactions on multimedia 2009-04, Vol.11 (3), p.443-454
Main Authors: Nakashima, Y., Tachibana, R., Babaguchi, N.
Format: Article
Language:English
Subjects:
Acoustic signal detection
Acoustic testing
Acoustics
Architectural acoustics
Audio watermarking
Camcorders
Estimates
Estimation error
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Internet
Mathematical models
Motion pictures
movie soundtrack
Multichannel
Multimedia
Physics
prevention of movie piracy
Recording
recording position estimation
Spread spectrum communication
Stochastic processes
Transduction
acoustical devices for the generation and reproduction of sound
Video equipment
Watermarking
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Summary:In recent years, the problem of camcorder piracy in theaters has become more serious due to technical advances in camcorders. In this paper, as a new deterrent to camcorder piracy, we propose a system for estimating the recording position from which a camcorder recording is made. The system is based on spread-spectrum audio watermarking for the multichannel movie soundtrack. It utilizes a stochastic model of the detection strength, which is calculated in the watermark detection process. Our experimental results show that the system estimates recording positions in an actual theater with a mean estimation error of 0.44 m. The results of our MUSHRA subjective listening tests show the method does not significantly spoil the subjective acoustic quality of the soundtrack. These results indicate that the proposed system is applicable for practical uses.
ISSN:1520-9210
1941-0077
DOI:10.1109/TMM.2009.2012938