An optical watermarking solution for color personal identification pictures

Yi-zhou Tan; Hai-bo Liu; Shui-hua Huang; Ben-jian Sheng

doi:10.1117/12.839630

18 November 2009 An optical watermarking solution for color personal identification pictures

Yi-zhou Tan, Hai-bo Liu, Shui-hua Huang, Ben-jian Sheng

Proceedings Volume 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security; 75120A (2009) https://doi.org/10.1117/12.839630
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

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.

Citation Download Citation

Yi-zhou Tan, Hai-bo Liu, Shui-hua Huang, and Ben-jian Sheng "An optical watermarking solution for color personal identification pictures", Proc. SPIE 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security, 75120A (18 November 2009); https://doi.org/10.1117/12.839630

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