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Proceedings Paper

An optical watermarking solution for color personal identification pictures
Author(s): Yi-zhou Tan; Hai-bo Liu; Shui-hua Huang; Ben-jian Sheng
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Paper Abstract

This paper presents a new approach for embedding authentication information into image on printed materials based on optical projection technique. Our experimental setup consists of two parts, one is a common camera, and the other is a LCD projector, which project a pattern on personnel's body (especially on the face). The pattern, generated by a computer, act as the illumination light source with sinusoidal distribution and it is also the watermark signal. For a color image, the watermark is embedded into the blue channel. While we take pictures (256×256 and 512×512, 567×390 pixels, respectively), an invisible mark is embedded directly into magnitude coefficients of Discrete Fourier transform (DFT) at exposure moment. Both optical and digital correlation is suitable for detection of this type of watermark. The decoded watermark is a set of concentric circles or sectors in the DFT domain (middle frequencies region) which is robust to photographing, printing and scanning. The unlawful people modify or replace the original photograph, and make fake passport (drivers' license and so on). Experiments show, it is difficult to forge certificates in which a watermark was embedded by our projector-camera combination based on analogue watermark method rather than classical digital method.

Paper Details

Date Published: 19 November 2009
PDF: 6 pages
Proc. SPIE 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security, 75120A (19 November 2009); doi: 10.1117/12.839630
Show Author Affiliations
Yi-zhou Tan, National Univ. of Defense Technology (China)
Hai-bo Liu, National Univ. of Defense Technology (China)
Shui-hua Huang, National Univ. of Defense Technology (China)
Ben-jian Sheng, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 7512:
2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security
Cunlin Zhang; Tiegen Liu, Editor(s)

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