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A zero-watermark method and device, and a watermark extraction method and device

A watermark extraction, zero watermark technology, applied in image data processing, instruments, image data processing and other directions, can solve the problems of complex construction and detection process, low accuracy of watermark detection threshold determination, etc., to achieve enhanced anti-attack ability and security. Improve and improve the effect of embedding capacity

Inactive Publication Date: 2017-10-20
HENAN NORMAL UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a zero-watermark method and device, and a watermark extraction method and device to solve the problems of low determination accuracy and complex construction and detection process of the watermark detection threshold of the existing zero-watermark method

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  • A zero-watermark method and device, and a watermark extraction method and device
  • A zero-watermark method and device, and a watermark extraction method and device
  • A zero-watermark method and device, and a watermark extraction method and device

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Embodiment Construction

[0063] The present invention will be further described in detail below in conjunction with the drawings.

[0064] The watermark embedding method of the present invention mainly includes: watermark scrambling, embedding steps and feature matrix acquisition steps. The invention is mainly based on the use of spread spectrum and despreading ideas in communication technology to extract a binary value from the carrier image at a set position The feature matrix is ​​XORed with the watermark image matrix scrambled by the generalized Arnold transform to obtain a feature matrix for blindly extracting the watermark image, but this algorithm does not change the pixels in the carrier image, thus constructing a The zero-watermark image of the frequency concept completely realizes the imperceptibility of the watermark and increases the amount of watermark embedded. Such a watermarking algorithm can not only be used as a robust watermark for copyright protection of digital works; it can also be ...

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Abstract

The present invention relates to a zero-watermark method and device, and a watermark extraction method and device. The present invention adopts the idea of ​​spectrum spreading and despreading to perform XOR processing on a binary feature matrix extracted from a carrier image and a watermark image matrix to obtain a feature matrix. Because of the blind watermark extraction, the watermark extraction algorithm is simple and easy to implement, and does not need to change the pixel value of the original carrier image. A zero watermark is constructed, which improves the embedding capacity of the watermark image and fully realizes the imperceptibility requirement of the watermark. Moreover, the acquisition of the binary feature matrix of the carrier image adopts the method of threshold and quantization. Coordinates, so that the extracted watermark distortion is small, and the anti-attack ability is enhanced.

Description

Technical field [0001] The invention relates to a zero watermark method and device, and a watermark extraction method and device; in particular, it relates to a digital image watermark technology in the field of information security. Background technique [0002] As an effective supplement to traditional encryption methods, digital image watermarking uses data embedding methods to hide in digital image products to prove the creator’s ownership of his work, and as a basis for identification and prosecution of illegal infringements, and at the same time pass the watermark detection And analysis to ensure the integrity and reliability of digital information has become an effective means of intellectual property protection and digital multimedia anti-counterfeiting. In recent years, it has attracted people's attention and has become a hotspot in international academic research. [0003] Zero-watermarking is an algorithm that does not change the image content and uses the important feat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 孙林徐久成王川张幸幸
Owner HENAN NORMAL UNIV
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