Text image watermark embedding method and system, extraction method and system

A text image, extraction method technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of robustness, watermark invisibility, etc.

Active Publication Date: 2021-02-02
INST OF AUTOMATION CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problems of invisibility, robustness, and algorithm security of the watermark, the present invention proposes a text image watermark embedding method and system, and at the same time, correspondingly proposes a text Image watermark extraction method and system

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  • Text image watermark embedding method and system, extraction method and system
  • Text image watermark embedding method and system, extraction method and system
  • Text image watermark embedding method and system, extraction method and system

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Embodiment Construction

[0081]In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than Full examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0082] The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, rather than to limit the invention. It should also be noted that, for the convenience of description, only the parts related to the related invention ...

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Abstract

The present invention proposes a text image watermark embedding method and system, extraction method and system, wherein the embedding method includes: after performing secondary encryption on the input watermark, the watermark to be embedded is obtained through error correction coding; Wavelet transform obtains four first frequency band coefficient matrices; The first frequency band coefficient matrix is ​​carried out block discrete cosine transform, obtains the corresponding first block coefficient matrix; For each described first block coefficient matrix, select the intermediate frequency coefficient, by Modifying the coefficients to embed the watermark to obtain each first block coefficient matrix after embedding the watermark; performing inverse discrete cosine transform and inverse discrete wavelet transform on each first block coefficient matrix after embedding the watermark to obtain a text image embedded with the watermark. The embodiment of the present invention improves the robustness and algorithm security of the watermark against attacks such as compression, noise, and clipping on the premise of ensuring the invisibility of the watermark.

Description

technical field [0001] The invention belongs to the field of digital media copyright protection, and in particular relates to a text image watermark embedding method and system, and an extraction method and system. Background technique [0002] With the development of Internet technology and the rapid popularization of digital information, the dissemination of digital media has become increasingly widespread. Digital media has the characteristics of easy dissemination and low cost. While people obtain digital media conveniently, they also face the risk of digital media content being pirated and tampered with. Therefore, it is necessary to properly deal with digital media before it is released. Digital watermarking technology is an effective digital media copyright protection technology, which can verify piracy and tampering behaviors and realize copyright protection of digital works. As a commonly used digital medium, the research on its watermarking technology is constantl...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00G06F21/60
CPCG06F21/602G06T1/0021G06T2201/0062
Inventor 关虎王玉莹张树武牛保宁黄樱张桂煊
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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