Digital image watermark embedding method and system thereof based on computer-generated hologram

A technology of computer holography and watermark embedding, which is applied in computing, image data processing, image data processing, etc. It can solve the problems of inability to extract watermark information, inability to resist strong clipping attacks, pollution, etc.

Active Publication Date: 2010-06-02
PEKING UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0008] However, although most of the existing watermarking schemes can resist various types of attacks, they are not robust against a certain type of attack, such as the ability to resist strong clipping attacks is weak, or cannot resist strong clipping attacks
In the actual dissemination proce...

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  • Digital image watermark embedding method and system thereof based on computer-generated hologram
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  • Digital image watermark embedding method and system thereof based on computer-generated hologram

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Embodiment Construction

[0039] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] In the present invention, the characteristics of the non-tearability of the Borch-type computational hologram and the anti-cutting characteristics of the Fourier transform are integrated, and the original digital watermark is made into a Borch-type computational hologram, which is embedded in the carrier image in blocks in the Fourier transform domain. Simulation experiments show that this scheme has good anti-cropping performance, and can still extract clear watermark information under the condition of more than 80% of strong clipping attacks, so as to achieve the purpose of copyright protection.

[0041] refer to figure 1 , figure 1 It is a flow chart of the steps of the embodiment of the computer holography-based digit...

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Abstract

The invention discloses digital image watermark embedding method and system thereof based on computer-generated hologram. The method comprises the steps of: fabricating an original watermark image into a Boqi type computer-generated hologram watermark according to the theory of Boqi type computer-generated hologram; segmenting an original carrier image into a plurality of subimage blocks which are not overlapped mutually, wherein each image block comprises 8*8 pixel points; respectively carrying out the Fourier transform on each subimage block; embedding the Boqi type computer-generated hologram watermark into each block subjected to the Fourier transform to obtain an embedded frequency domain image; and carrying out inverse Fourier transform on the embedded frequency image to obtain a watermark embedded image. The bargain characteristic of the Boqi type computer-generated hologram and the shearing resistance of the Fourier transform are applied to the digital watermark, the watermark is embedded in a Fourier frequency domain by blocks, and clear watermark information can be always extracted under the condition of bearing more than 80 percent of strong shearing attack.

Description

technical field [0001] The invention relates to digital image copyright protection technology, in particular to a computer holography-based digital image watermark embedding method and system thereof. Background technique [0002] The rapid development of network technology and communication technology provides convenience for people to transmit and exchange various information on the network, but it also provides more convenient channels for criminals to obtain and disseminate digital products. Therefore, protecting the copyright of digital products and preventing piracy have become one of the serious problems faced by digital products and network applications. Digital image watermarking technology is a kind of watermark information that hides content such as intellectual property information in the carrier image, and restores copyright information through watermark extraction and detection technology to achieve the purpose of protecting digital copyright. In order to meet...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 杨光临
Owner PEKING UNIV
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