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Method for watermarking hologram for resisting photo printing-scanning attack and hard copy cutting

A photo printing and holographic image technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of watermark image quality degradation, blind detection ability without shear resistance, etc.

Inactive Publication Date: 2009-09-02
SHANGHAI UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Only "Double Random Phase Encryption Coaxial Fourier Holographic Watermark Anti-Counterfeiting Technology" discusses the issue of printing and scanning. This method only considers black and white images. Compared with the carrier image, the quality of the generated watermarked image is obviously degraded, and it is not anti-shearing. Cut blind detection capability

Method used

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  • Method for watermarking hologram for resisting photo printing-scanning attack and hard copy cutting
  • Method for watermarking hologram for resisting photo printing-scanning attack and hard copy cutting
  • Method for watermarking hologram for resisting photo printing-scanning attack and hard copy cutting

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Embodiment Construction

[0057] A preferred embodiment of the present invention is described in detail as follows in conjunction with accompanying drawing:

[0058] see figure 1 , this holographic image watermarking method against photo printing—scanning attack and hard copy cutting, directly embeds a digital watermarked hologram in the carrier image, and after the watermarked image is output by a photo printer, the watermark is retained in the hard copy, and the user scans it again The digital image can be obtained, and the watermark can be extracted reliably. It is characterized in that the Fourier transform hologram of the digital watermark is first calculated based on the conjugate symmetry method, and the watermark hologram is superimposed on the carrier image to realize the watermark information hiding. Through the spatial layout of the watermark and The carrier image is preprocessed to reduce the impact of embedded data on the image quality to the extent that it is visually imperceptible, and t...

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Abstract

The invention relates to a method for watermarking a hologram for resisting photo printing-scanning attack and hard copy cutting. The method is on the basis of a Fourier computed hologram of conjugation symmetrical calculating digital watermarking to superpose the watermarking hologram in a carrier image so as to achieve watermarking information hiding; by performing watermarking spatial layout and preprocessing the carrier image, the method reduces the influence on the image quality by embedded data to a non detectable degree by vision, and separates frequency spectrums containing carrier information from watermarking information in a watermarking image so as to achieve the blink picking of watermarks. The method can preserve the watermarks in a high-quality hard copy, can resist the cutting of the hard copy, does not need the simulation of the interference of object light and reference light for the acquisition of the watermarking hologram, and achieves a convenient and efficient algorithm.

Description

technical field [0001] The present invention relates to a holographic image watermarking method that is resistant to photo printing-scanning attacks and hard copy cutting by using computational holography and image processing technology. Background technique [0002] With the rapid development of network technology and digitalization of media information, the copyright protection technology of multimedia works based on digital watermark has become a research hotspot in the field of information science. Digital watermarking is to embed hidden information in digital products such as images, videos and audios that can prove copyright ownership or track infringement, so that it can be extracted as evidence when necessary. Embedded watermarks should be transparent, robust and secure. [0003] Invisible watermarking in digital images has been extensively studied, and many excellent techniques with high transparency and robustness have been proposed. However, after the digital im...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 黄素娟王朔中张新鹏吴蔚
Owner SHANGHAI UNIV
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