Method for embedding reversible watermark in digital image and method for extracting reversible watermark from digital image

A digital image and watermarking technology, applied in image data processing, image data processing, instruments, etc., to achieve the effect of good visual effect, high unit embedding rate, and high embedding ability

Inactive Publication Date: 2010-09-15
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for embedding a reversible watermark in a digital image and its extraction method, which can ensure a higher embedding rate and better visual effects, and solve the problem of freely embedding a watermark according to the embedding rate

Method used

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  • Method for embedding reversible watermark in digital image and method for extracting reversible watermark from digital image
  • Method for embedding reversible watermark in digital image and method for extracting reversible watermark from digital image
  • Method for embedding reversible watermark in digital image and method for extracting reversible watermark from digital image

Examples

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Effect test

Embodiment 1

[0096] A grayscale image Baboon as shown in Figure 3 (A), we use the method described in the present invention to embed it Bit watermark information. The process of watermark embedding and the required parameters have been described in detail above and will not be repeated here. Figure 3(B) is the image after embedding the watermark. It can be seen that the visual effect of the image after embedding the watermark is good. In fact, only the parts around the nose with a single color and extremely simple texture can see a slight difference in smoothness. It is difficult to see the traces of modification in other places. Then the watermark is extracted through the watermark algorithm in the present invention, all P-bit watermark information can be successfully extracted, and the original image can be restored.

[0097] The above examples can show that after embedding with this algorithm, good visual effects can be achieved.

Embodiment 2

[0099] For a grayscale image Airplane shown in Figure 4 (A), use the method described to embed it Bit watermark information. The process and required parameters of watermark embedding are the same as those in the previous example and will not be repeated here. Figure 4(B) is the image after embedding the watermark. The watermark information of all bits can be successfully extracted through the watermark extraction algorithm and the original image can be restored.

[0100] In the above example, we have achieved a unit pixel embedding rate of 1.8 bits, which is relatively rare in reversible watermarking algorithms. It shows that this method has high embedding ability.

[0101] The invention provides a device for embedding a reversible watermark, which includes:

[0102] A block unit for dividing a digital image into disjoint pixel blocks of equal size;

[0103] A judging unit, configured to judge which pixel blocks can be embedded with a watermark, and obtain a sequence of...

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Abstract

The invention relates to a method for embedding a reversible watermark in a digital image and a method for extracting the reversible watermark from the digital image, and belongs to the field of information technology. The method for embedding the reversible watermark comprises the following steps of: dividing a carrier image and establishing a location mark sequence LMC, and dividing all pixels into three parts of I1, I2, and I3; embedding watermark in the pixel blocks in the I1 and I3; recording the lowest effective bit in the I1 into a sequence C, and using the LMC to replace the lowest effective bit in the I1; and finally, embedding the sequence C into an embeddable pixel block in the I2. The method for extracting the reversible watermark comprises the following steps of: dividing the carrier image and extracting the location mark sequence LMC; then dividing the pixel blocks into three parts of I1, I2, and I3; performing reverse transformation on the pixel blocks in the I2 according to the LMC to obtain an original pixel value sequence C; replacing the lowest effective bit in the I1 by the value in the sequence C; and finally, performing reverse transformation on the pixel blocks in the I1 and I3 according to the LMC to acquire an original pixel value and embedded watermark information. The method for embedding the reversible watermark in the digital image and the method for extracting the reversible watermark from the digital image improve the embedding capacity and do not need the original images during extraction.

Description

technical field [0001] The invention belongs to the technical field of information hiding and digital watermarking, and in particular relates to a method for embedding a reversible watermark in a digital image and an extraction method thereof. Background technique [0002] Information Hiding is a new research hotspot in the field of information security. In the past ten years, the research in this direction has attracted more and more people's attention, and the research team has expanded rapidly. has been widely applied. It provides a reliable information security guarantee for confidential data communication in an open network environment, intellectual property protection of digital products, authenticity verification of important documents and digital signatures, and source tracking of confidential documents after leaks. [0003] Digital watermarking (Digital Watermarking) and image steganography (Steganography) are two branches of information hiding technology. These t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 王超李晓龙亓文法杨斌
Owner PEKING UNIV
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