Color image-based semi-blind watermarking method for preventing typing, printing and shooting behaviors
A color image, blind watermarking technology, applied in image watermarking, image data processing, image data processing and other directions, can solve problems such as damage to owners' rights and interests, inability to fully extract watermarks, and difficulty in extracting secret information from images, and achieve good application value. , the effect of good invisibility and large amount of embedded information
Active Publication Date: 2019-11-01
UNIV OF SHANGHAI FOR SCI & TECH
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[0003]
At present, there are still many disadvantages in the image anti-counterfeiting technology for printing, printing and mobile phone shooting. For example, when the product packaging logo image is taken with a mobile phone, it is difficult to extract secret information from the obtained image due to the change of ambient light brightness. If all original watermark information cannot be obtained in time, It will lead to the inability to fully extract the watermark, etc. These problems will cause damage to the rights and interests of the owner
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[0044] Invented a semi-blind watermarking method based on color image printing, printing and shooting, embedding watermarking method: first, convert the color carrier image to YUV color space, take the U component and divide it into blocks to obtain several non-overlapping sub-blocks; then, Select sub-blocks with low energy in the sub-blocks for DWT transformation and SVD decomposition to obtain the corresponding sub-block unitary matrix; finally, using the stable characteristics of the sub-block unitary matrix coefficient difference, the R channel of the color QR code is normalized and embedded In the U component of the color carrier image, the final watermarked image is obtained. The method of extracting watermark is the inverse operation of embedding watermark. like figure 1 The shown embedding flow chart of the semi-blind watermarking method based on color image-based anti-printing, printing and shooting, the specific implementation steps are as follows:
[0045] 1. Conv...
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The invention relates to a color image-based semi-blind watermarking method for preventing typing, printing and shooting behaviors. The method comprises the steps: firstly converting a color carrier image into a YUV color space, and carrying out the partitioning of a U component; secondly, selecting sub-blocks with low energy to perform DWT (Discrete Wavelet Transform) and SVD (Singular Value Decomposition); and finally, normalizing and embedding the main color channel of the color QR code into the U component of the color carrier image by utilizing the stability characteristic of the unitarymatrix coefficient difference of the sub-blocks to obtain a final watermark-containing image. The method has strong robustness for preventing typing, printing and shooting behaviors. After compression, filtering, rotation and cutting, printing, printing and shooting are carried out. A color QR code can still be extracted and the copyright information can be correctly identified. The good invisibility and embedding amount are realized. The adopted mobile phone equipment is rapid and convenient. The technology has good practical application value in the aspect of commodity package anti-counterfeiting.
Description
technical field [0001] The invention relates to an image anti-counterfeiting technology, in particular to a semi-blind watermarking method based on a color image that is resistant to printing, printing and photographing. Background technique [0002] In the commodity society, product packaging plays an important role, but the problem of counterfeit and shoddy goods is also becoming more and more serious. Therefore, it is very important for image anti-counterfeiting. With the development of Internet plus technology, it is a new research direction to realize intelligent authentication and anti-counterfeiting by using mobile terminals and widely used QR codes. [0003] At present, there are still many disadvantages in the image anti-counterfeiting technology for printing, printing and mobile phone shooting. For example, when the product packaging logo image is taken with a mobile phone, it is difficult to extract secret information from the obtained image due to the change of ...
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Login to View More IPC IPC(8): G06T1/00
CPCG06T1/005G06T1/0071G06T2201/0051G06T2201/0052Y02D10/00
Inventor 王晓红王春霞
Owner UNIV OF SHANGHAI FOR SCI & TECH