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Encrypted holographic watermark algorithm of transform domain based on copyright protection

A copyright protection and transform domain technology, applied in computing, image data processing, instruments, etc., can solve problems such as poor robustness and invisibility, and achieve high security and good invisibility effects

Inactive Publication Date: 2011-11-09
UNIV OF SHANGHAI FOR SCI & TECH
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  • Description
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Problems solved by technology

The spatial domain method mainly embeds the watermark by changing some pixel values ​​in the original image, which is poor in robustness and invisibility

Method used

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  • Encrypted holographic watermark algorithm of transform domain based on copyright protection
  • Encrypted holographic watermark algorithm of transform domain based on copyright protection
  • Encrypted holographic watermark algorithm of transform domain based on copyright protection

Examples

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Embodiment Construction

[0021] In order to ensure the security of watermark information, the transform domain encryption holographic watermarking algorithm based on copyright protection first performs double random phase modulation on the watermark information and generates a watermark hologram; secondly, the L component of the carrier image in the Lab space is divided into 4×4 blocks , DCT transforms each block, extracts the low- and medium-frequency coefficients of each matrix to form a new matrix, and performs wavelet decomposition on it, embeds the watermark hologram into its low- and medium-frequency wavelet coefficients, and obtains the embedded For color images, the watermark image can be extracted again by operating the step direction.

[0022] like figure 1 The flow chart of the watermark embedding algorithm is shown, (1) Generate two random matrices p, b as the dual phase of the optical holographic system, that is, the dual key of the encryption and decryption system; phase the generated wa...

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Abstract

The invention relates to an encrypted holographic watermark algorithm of a transform domain based on copyright protection, comprising the following steps of: carrying out random double-phase modulation on watermark information to generate a watermark holographic image; then carrying out 4*4 partitioning on an L component of a carrier image in a Lab space; carrying out DCT (Discrete Cosine Transformation) conversion on each partition; extracting a middle-low frequency coefficient of each matrix to form a new matrix and carrying out wavelet decomposition on the new matrix; embedding the watermark holographic image into the middle-low frequency wavelet coefficient to obtain an embedded colorful image; and then extracting the watermark image again by directionally operating the steps. The watermark has good invisibility and higher safety by carrying out random double-phase encryption on the watermark image; and the original image is not needed in the step of extracting the watermark image, and the watermark belongs to a blind testing watermark.

Description

technical field [0001] The invention relates to a watermarking technology, in particular to a transform domain encryption holographic watermarking algorithm based on copyright protection. Background technique [0002] The development of multimedia technology and network technology has promoted the progress of digital watermarking technology. Digital watermarking technology is an effective way of digital copyright protection. The data transmitted by multimedia is mainly based on color images, and a large number of existing mature watermarking algorithms for gray images are not suitable for direct application to color images. It is of great practical significance to study practical color image watermarking algorithms. [0003] The research direction of watermarking technology is mainly concentrated in the transform domain. The spatial domain method mainly embeds the watermark by changing some pixel values ​​in the original image, which has poor robustness and invisibility. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 李孟涛张雷洪王洪来孙刘杰
Owner UNIV OF SHANGHAI FOR SCI & TECH
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