Digital image blind watermarking method based on two-dimensional discrete cosine transform

A two-dimensional discrete cosine and digital image technology, applied in the field of information security, can solve problems such as piracy, infringement, and tampering

Active Publication Date: 2019-05-31
LUDONG UNIVERSITY
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Problems solved by technology

[0002] With the rapid development of the Internet and multimedia technology, the Internet has penetrated into all aspects of daily life, and we can obt...

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  • Digital image blind watermarking method based on two-dimensional discrete cosine transform
  • Digital image blind watermarking method based on two-dimensional discrete cosine transform
  • Digital image blind watermarking method based on two-dimensional discrete cosine transform

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Embodiment Construction

[0038] The purpose of this invention is to provide a kind of digital image blind watermark method based on two-dimensional discrete cosine transform, it is characterized in that the realization of watermark is divided into two processes of watermark embedding and watermark extraction, and its watermark embedding process is described as follows:

[0039] The first step: Preprocessing of the host image and watermark image: a grayscale host image with a size of 512×512 H Divided into non-overlapping pixel blocks with a size of 8×8; for a grayscale watermark image with a size of 32×32 W private key based Ka i The Arnold transform to improve the security of the watermark, and the watermark image W Each decimal pixel value in is converted into an 8-bit binary sequence (for example: the decimal number 214 can be converted into a binary sequence '11010110'), which is sequentially connected into a watermark bit sequence SW, SW The length is 8×32 2 = 8192;

[0040] Step 2: Sele...

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Abstract

The invention discloses a digital image blind watermarking method based on two-dimensional discrete cosine transform by utilizing the advantage of high robustness of a frequency domain digital watermarking algorithm. According to the method, a part of intermediate frequency coefficients of an image block subjected to two-dimensional discrete cosine transform are selected in a transform domain, andthe embedding and blind extraction of the digital watermark are completed by modifying the size relation between the selected frequency coefficients. According to the method, the digital image watermark is embedded into the host image, so that the method not only has relatively good watermark invisibility, but also has relatively high robustness, and is suitable for occasions of digital image copyright protection.

Description

technical field [0001] The invention belongs to the technical field of information security and relates to high invisibility and strong robustness digital watermark copyright protection of digital images. Background technique [0002] With the rapid development of the Internet and multimedia technology, the Internet has penetrated into all aspects of daily life, and we can obtain the information we need more accurately and efficiently, but a series of serious problems have also arisen, such as piracy, infringement, tampering, etc. Therefore, the protection of intellectual property rights and copyrights is imminent, and digital watermarking technology emerges as the times require. The successful embedding and extraction of digital image watermark can effectively protect its copyright, thus solving this problem. In the research of digital watermarking in recent years, the digital watermarking algorithm with good watermark invisibility and strong robustness has gradually becom...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 苏庆堂袁子涵刘得成王环英王刚邓冠龙
Owner LUDONG UNIVERSITY
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