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1 June 2007 Computer-generated hologram watermarking resilient to rotation and scaling
Min Liu, Guanglin Yang, Haiyan Xie, Mingyao Xia, Jianbin Hu, Hongbin Zha
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Optical Engineering, Vol. 46, Issue 6, 060501 (June 2007). https://doi.org/10.1117/1.2744330
Abstract
We propose a new scheme of computer-generated hologram (CGH) watermarking to resist rotation and scaling. To embed the inverse log-polar mapping of a mark pattern's CGH into a cover image, the twin image of the mark pattern can be directly reconstructed by fast Fourier transformation from the log-polar mapping of the watermarked image after rotation and scaling, not requiring a registration step in the extracting procedure. In an experiment, the information position of the twin image is located in the high-frequency domain and the redundant information of the low-frequency component is properly eliminated, so the contrast of the twin image is appropriately enhanced and the basic information of the mark pattern is effectively preserved to be recognized. The experimental results show that the mark-pattern's information can be effectively reconstructed when the watermarked image is scaled by 0.5 to 2 or rotated by any angle, so this watermarking scheme is effectively verified by experiment.
©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)
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Min Liu, Guanglin Yang, Haiyan Xie, Mingyao Xia, Jianbin Hu, and Hongbin Zha "Computer-generated hologram watermarking resilient to rotation and scaling," Optical Engineering 46(6), 060501 (1 June 2007). https://doi.org/10.1117/1.2744330
Published: 1 June 2007
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Cited by 7 scholarly publications.
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KEYWORDS
Digital watermarking
Computer generated holography
3D image reconstruction
Image enhancement
Image quality
Image registration
Associative arrays
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