A digital watermark authentication method and device

A technology of digital watermarking and authentication method, which is applied in the field of information security and can solve problems such as loss of watermark information

Active Publication Date: 2019-06-04
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the printing field, the image carrier information embedded with watermark information has the problem of loss of watermark information after printing and scanning.

Method used

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  • A digital watermark authentication method and device
  • A digital watermark authentication method and device
  • A digital watermark authentication method and device

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Embodiment Construction

[0078] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0079] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

[0080] figure 1 It is a schematic flowchart of a method for generating a carrier image embedded with a watermark information image according to an embodiment of the present invention. As shown in the figure, the digital watermark authentication method provided by the ...

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Abstract

The invention discloses a digital watermark authentication method and device, and the method comprises the steps: generating a carrier image in which a watermark information image is embedded, and generating a digital hologram according to the watermark information image; Taking the original carrier image as the amplitude of an input object light function of the front focal plane of the lens; using a digital hologram as an output object light function of the rear focal plane; establishing a constraint condition equation comprising the original carrier image, the digital hologram and the phasefunction, calculating and solving the phase function satisfying the constraint condition equation by utilizing fractional Fourier transform, and obtaining the carrier image embedded with the watermarkinformation image according to the phase function satisfying the constraint condition equation; And determining an extraction password for extracting the digital hologram, extracting the digital hologram according to the original carrier image and the extraction password, and reconstructing a watermark information image based on the digital hologram. The invention provides a digital watermark authentication method and device with good anti-printing performance.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a digital watermark authentication method and device. Background technique [0002] Digital watermarking technology is to embed watermark information directly into the carrier information or indirectly express it, which does not affect the use value of the carrier information, and is not easy to be detected and modified again. Digital watermarking technology has been widely used in the field of multimedia information security research. At present, in the field of printing, after the image carrier information embedded with watermark information is printed and scanned, there is a problem that the watermark information is lost. In recent years, information optical holographic technology has been applied to information hiding and digital watermarking due to its advantages of multi-dimensionality, large capacity, high degree of design freedom, high robustness, difficulty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00H04N1/32
Inventor 王安玲刘福平李诗珂郭蕾庞建萍辛旷
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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