Binary Phase-Only Filter Watermarking with Quantized Embedding

The binary phase-only filter digital watermarking embeds the phase information of the discrete Fourier transform of the image into the corresponding magnitudes for better image authentication. The paper proposed an approach of how to implement watermark embedding by quantizing the magnitude, with discussing how to regulate the quantization steps based on the frequencies of the magnitude coefficients of the embedded watermark, and how to embed the watermark at low frequency quantization. The theoretical analysis and simulation results show that algorithm flexibility, security, watermark imperceptibility and detection performance of the binary phase-only filter digital watermarking can be effectively improved with quantization based watermark embedding, and the robustness against JPEG compression will also be increased to some extent.

Authors:

• Hu Haibo
• Liu Yi
• He Ming

Keywords:

• binary phase-only filter
• discrete Fourier transform
• digital watermarking
• image authentication
• quantization.

References:

[1] F. Ahmed and I. S. Moskowitz, "Correlation-based Watermarking Method
for Image Authentication Applications," Optical Engineering, 2004,
vol.43, no.8, pp.1833-1838.
[2] F. Ahmed and I. S. Moskowitz, "The Binary Phase Only Filter as An
Image Watermark", http://www.stormingmedia.us/82/8245/A824564.
html, last viewed on April 4, 2010.
[3] J. Sang and M.S. Alam, "Binary Phase-only Filter based Image
Self-authentication," In Proceedings of SPIE´╝î International Society for
Optical Engineering, vol. 5908, Optical Information Systems III, San
Diego, CA, USA, July 2005, pp.1G-1-1G-8.
[4] Li Xudong, "Blocked DCT and Quantization Based Blind Image Watermark
Algorithm," Computer Engineering, 2006, vol. 32, no.21,
pp.139-140 (in Chinese).
[5] B. Kumar and L. Hassebrook, "Performance Measures for Correlation
Filters," Applied Optics, 1990, vol. 29, no.20, pp.2997-3006.
[6] J. F. Delaigle, C. De Vleeschouwer, B. Macq, "Watermarking Algorithm
based on a Human Visual Model," Signal Processing, 1998, vol.66, no.3,
pp.319-335.