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A Color Image Digital Watermarking Method Based on Multiple Transform Domains

A color image and digital watermarking technology, applied in image watermarking, image data processing, image data processing and other directions, can solve the problems of single processing method, unable to make full use of color image embedding space, no combination of channel processing and overall processing methods, etc. , to achieve the effect of improving the robustness

Active Publication Date: 2021-11-16
CHONGQING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Claims
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Problems solved by technology

To sum up, there are some problems in the existing color image watermarking algorithm: 2) The processing method is relatively simple, and the sub-channel processing and the overall processing method are not combined, and the huge embedding space of the color image cannot be fully utilized.

Method used

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  • A Color Image Digital Watermarking Method Based on Multiple Transform Domains
  • A Color Image Digital Watermarking Method Based on Multiple Transform Domains
  • A Color Image Digital Watermarking Method Based on Multiple Transform Domains

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Embodiment Construction

[0020] In order to make the technical solution of the present invention clearer, the specific content of the present invention will be further clarified in conjunction with the drawings and embodiments, but the content of the present invention is not limited to the following embodiments. Those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms are also within the scope of the claims listed in this application.

[0021] The invention proposes a color image digital watermark processing method based on multi-transform fields. It mainly includes two parts: watermark embedding and watermark extraction.

[0022] The watermark embedding part includes: do DWT after scrambling the channel of the color image, and describe the frequency subbands of the same type with quaternions; determine the frequency subbands to be embedded according to the size of the watermark information, and determine the quaternion corresponding to th...

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Abstract

The invention proposes a color image digital watermarking method based on multi-transform domains, combining discrete wavelet transform (DWT), quaternion discrete cosine transform (QDCT) and singular value decomposition (SVD). First, the color image is divided into DWT channels, and then the same frequency subbands of the three channels are described by quaternions, and then divided into blocks according to the size of the watermark, and each sub-block is subjected to DQCT to form a coefficient matrix. Finally, in the guarantee Under visually perceptible quality, the watermark is embedded into the coefficient matrix. The present invention provides a new color image watermarking method. Aiming at the existing color image digital watermarking algorithm, there is still room for improvement in the relationship between robustness and transparency. By making full use of the advantages of each transformation method, under the premise of ensuring transparency, Improve the robustness and embedding capacity of watermarking algorithms.

Description

technical field [0001] The invention belongs to the field of image signal processing, in particular to a color image digital watermarking method based on multi-transform fields. Background technique [0002] With the rapid development of Internet technology, the transmission of digital multimedia data has become faster and more convenient, which has caused more and more serious personal copyright infringement problems. Therefore, it is necessary to strengthen the personal copyright protection of digital works, among which, digital watermarking technology, as an effective way of copyright protection, has also received much attention. Digital watermarking technology is to embed copyright information directly into the uploaded image. When the copyright needs to be verified, the copyright information is directly extracted through the extraction algorithm corresponding to the embedded algorithm, so as to achieve the purpose of copyright protection of the work. [0003] Grayscale...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00G06F17/16
CPCG06F17/16G06T1/005G06T2201/0065
Inventor 陈善学漆若兰周艳发唐义嫄
Owner CHONGQING UNIV OF POSTS & TELECOMM
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