Method for embedding watermark image

A technology of watermark image and watermark embedding, applied in the field of image processing, can solve the problems of difficult blind extraction, reducing imperceptibility, and high difficulty in embedding

Active Publication Date: 2013-01-16
JIANGSU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of information hiding capacity, using grayscale image as image watermark for embedding is not only difficult to embed, but also

Method used

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  • Method for embedding watermark image
  • Method for embedding watermark image

Examples

Experimental program
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Example

[0048] (Example 1)

[0049] see Figure 1-3 , The embedded object of the watermark image in this embodiment is a matrix The original carrier image (M=N=512, that is, an image with 512 pixels in length and width), the format is an uncompressed 8-bit or more high-precision grayscale bitmap (bmp or tiff), or JPG format image. Gray-scale watermark images generally select trademarks or copyright signs, and the total number of pixels n must be smaller than the carrier image (n

[0050] The steps for determining the embedding position of the carrier image and embedding the gray-scale watermark information are as follows:

[0051] (1) Preprocessing of watermark image. In order to ensure the security of the watermark, the watermark image is scrambled by some algorithms (such as chaotic sequence scrambling method, etc.), the image after scrambling is marked as W, and the image 40×49 is transformed ...

Example

[0069] (Example 2)

[0070] The steps for restoration and authentication of gray watermark images are as follows:

[0071] (A) The matrix of the original carrier image is , The watermarked image to be inspected is , Respectively divide into corresponding number of 8×8 image blocks that do not cover each other, and perform DCT transformation on each image block, and extract the corresponding low-frequency and high-frequency data from each 8×8 image block according to the 8×8 template, and The low-frequency and high-frequency data in each 8×8 image block in the original carrier image form a 3×3 matrix respectively With a 6×6 matrix , The low-frequency and high-frequency data in each 8×8 image block of the watermarked image form a matrix of 3×3 With a 6×6 matrix , For the matrix , Perform singular value decomposition separately: , ;

[0072] (B) Solve the watermark information change value in each 8×8 image block , , M is the total number of the original image divided into t...

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Abstract

The invention relates to a method for embedding a grayscale watermark image. The method is suitable for solving the problem of conflict between the transparency and robustness of a watermarking algorithm. The method comprises the following steps of: blocking an original carrier image, performing discrete cosine transformation (DCT), dividing a coefficient into a low-frequency data block, an intermediate-frequency data block and a high-frequency data block by utilizing a template, performing singular value decomposition (SVD) after a new matrix is formed, calculating the energy ratio of the blocks, and determining an optimal block position into which the watermark image is suitable to be embedded; and adaptively embedding grayscale watermark information into a singular value of the low-frequency block according to the energy ratio.

Description

[0001] This application is a divisional application, the application number of the original application: 201110139206.9, the application date: 2011-5-26, and the name of the invention: the embedding and extraction method of watermark image. technical field [0002] The invention relates to the technical field of image processing, in particular to a watermark image embedding method. Background technique [0003] With the rapid development of digital multimedia technology and Internet technology, the security of multimedia products has become a very important and challenging research topic. Digital watermarking technology is a potentially effective method to realize the copyright protection of digital products. It has become a research hotspot in the field of information security and an important branch of information hiding research. It is against this background that digital watermarking comes into being. It has become a frontier and hot direction of current academic researc...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 王海峰章怡
Owner JIANGSU UNIV OF TECH
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