Color image digital watermarking method based on multi-transform domain

A color image and digital watermarking technology, applied in the direction of image watermarking, image data processing, image data processing, etc., 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: 2018-09-21
CHONGQING UNIV OF POSTS & TELECOMM
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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

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  • Color image digital watermarking method based on multi-transform domain
  • Color image digital watermarking method based on multi-transform domain
  • Color image digital watermarking method based on multi-transform domain

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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 provides a color image digital watermarking method based on a multi-transform domain. The method comprises the steps of, firstly, performing sub-channel DWT processing on a color image in combination with discrete wavelet transform (DWT), quaternion discrete cosine transform (QDCT) and singular value decomposition (SVD); then describing homogeneous frequency sub-bands of the three channels with a quaternion; then performing blocking according to a watermark size, performing DQCT on each sub-block to form a coefficient matrix; and finally, embedding a watermark into the coefficient matrix on the premise of guaranteeing visual perception quality. The invention provides a new color image watermarking method. For the fact that an existing color image digital watermarking algorithm has room for improvement in the relation of balancing robustness and transparency, the advantages of each transform method are fully utilized, and the robustness and embedding capacity of the watermarking algorithm are improved on the premise of guaranteeing the transparency.

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...

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Application Information

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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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