Halftone watermarking method based on pixel block odd-even check and pixel block error dispersion

A technology of parity check and error dispersion, which is applied in the field of image processing, can solve problems such as the difficulty of extracting watermarks, and achieve the effects of ensuring the robustness of watermarks, easy extraction, and improving visual effects

Active Publication Date: 2013-02-13
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

The disadvantage of this type of method is that it is necessary to superimpose multiple watermarked images together to extract the watermark, and when superimposing watermarked images requires strict alignment of multiple images, it is difficult to extract the watermark

Method used

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  • Halftone watermarking method based on pixel block odd-even check and pixel block error dispersion
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  • Halftone watermarking method based on pixel block odd-even check and pixel block error dispersion

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Embodiment Construction

[0053] Attached below figure 1 The present invention is described in detail.

[0054] Step 1, image color separation:

[0055] The present invention is not only applicable to grayscale images, but also to color images, so the operations on color images and grayscale images are also different. Before embedding the watermark, it is first necessary to judge whether the carrier image is a color image. If the carrier image is a color image, use the following formula to convert the carrier image from the red-green-blue RGB color space to the cyan-magenta-red-yellow-black CMYK color space so that it conforms to The color model in the printer, so that the three color channels of cyan C, magenta M and yellow Y can be embedded respectively; if the carrier image is a grayscale image, go to step 2.

[0056] K = min ( 255 - ...

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Abstract

The invention discloses a halftone watermarking method based on pixel block odd-even check and pixel block error dispersion. The halftone watermarking method includes steps: (1) image color separating; (2) watermark image preprocessing; (3) pixel block odd-even check value calculating; (4) watermark embedding strength determining; (5) watermark embedding; (6) image correction and (7) watermark drawing. The halftone watermarking method solves the problems in the prior art that scanned images to be detected are required to be subjected to binaryzation during watermark drawing and watermarks are poor in robustness and cannot really resist printing scanning attack. The halftone watermarking method has the advantages of being good in robustness, capable of effectively resisting printing scanning, random altering and tailoring and other attack and capable of drawing watermarks easily.

Description

technical field [0001] The invention belongs to the technical field of image processing, and further relates to a halftone watermarking method based on pixel block parity check and block error dispersion in the technical field of information hiding. The invention can be used to embed watermark information into the image while printing / printing the output image, and extract the embedded watermark information by scanning the printed image, so as to realize the copyright protection of printing and printed matter. Background technique [0002] In recent years, in many printing and publishing applications, the increasing counterfeiting has brought new challenges to the anti-counterfeiting of print / print output products. As a technical measure of digital product copyright protection, digital watermarking technology is widely used at home and abroad. The watermarks for printouts, books, magazines and other printed materials are halftone image watermarks, and there are mainly three...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 郑海红王泉王义峰陈瑞琳潘蓉谢琨罗雪梅万波
Owner XIDIAN UNIV
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