PROTECTION OF 3D OBJECTS AGAINST ILLEGAL PHOTOGRAPHY USING OPTICAL WATERMARKING TECHNIQUE WITH SPATIALLY MODULATED ILLUMINATION

Yasunori Ishikawa, Kazutake Uehira, Kazuhisa Yanaka

Abstract

We present a new technique that protects the copyrights or portrait rights of 3D objects such as sculptures, merchandise, and even human bodies, with optical watermarking, which is produced by spatially modulated illumination. Although the previous study revealed that the optical watermarking technique could prevent objects from being illegally photographed without protection, the technique could only be applied to 2D objects. The largest problem to be solved in extending this technique to the case of 3D objects is to compensate for geometrical distortion. We solved this problem by introducing rectangular mesh fitting and a technique of "bi-linear interpolation" based on the four nearest points. We conducted experiments in which we projected optical watermarking onto the surface of a globe and a model of the human face, and evaluated the accuracy of extracted data. The results were almost 100% in both cases when a Discrete Cosine Transform (DCT) and a Walsh-Hadamard Transform (WHT) were used as methods of embedding watermarks.

References

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  2. Uehira, K. and Suzuki, K. 2008. Digital watermarking technique using brightness-modulated light. Proc. ICME2008, 257-260.
  3. Ishikawa, Y., Uehira, K. and Yanaka, K. 2009. Illumination watermarking technique using orthogonal transforms. Proc. IAS2009, 257-260.
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Paper Citation


in Harvard Style

Ishikawa Y., Uehira K. and Yanaka K. (2011). PROTECTION OF 3D OBJECTS AGAINST ILLEGAL PHOTOGRAPHY USING OPTICAL WATERMARKING TECHNIQUE WITH SPATIALLY MODULATED ILLUMINATION . In Proceedings of the International Conference on Imaging Theory and Applications and International Conference on Information Visualization Theory and Applications - Volume 1: IMAGAPP, (VISIGRAPP 2011) ISBN 978-989-8425-46-1, pages 49-52. DOI: 10.5220/0003314400490052


in Bibtex Style

@conference{imagapp11,
author={Yasunori Ishikawa and Kazutake Uehira and Kazuhisa Yanaka},
title={PROTECTION OF 3D OBJECTS AGAINST ILLEGAL PHOTOGRAPHY USING OPTICAL WATERMARKING TECHNIQUE WITH SPATIALLY MODULATED ILLUMINATION},
booktitle={Proceedings of the International Conference on Imaging Theory and Applications and International Conference on Information Visualization Theory and Applications - Volume 1: IMAGAPP, (VISIGRAPP 2011)},
year={2011},
pages={49-52},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0003314400490052},
isbn={978-989-8425-46-1},
}


in EndNote Style

TY - CONF
JO - Proceedings of the International Conference on Imaging Theory and Applications and International Conference on Information Visualization Theory and Applications - Volume 1: IMAGAPP, (VISIGRAPP 2011)
TI - PROTECTION OF 3D OBJECTS AGAINST ILLEGAL PHOTOGRAPHY USING OPTICAL WATERMARKING TECHNIQUE WITH SPATIALLY MODULATED ILLUMINATION
SN - 978-989-8425-46-1
AU - Ishikawa Y.
AU - Uehira K.
AU - Yanaka K.
PY - 2011
SP - 49
EP - 52
DO - 10.5220/0003314400490052