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Method for preventing color image blind watermarking from being printed and scanned based on DCT coefficient statistical property

An anti-print scanning, color image technology, applied in image coding, image data processing, image data processing and other directions, can solve the problems of poor robustness, low embedding capacity, etc., to achieve a wide range of applications, improve embedding capacity, high practical value Effect

Inactive Publication Date: 2014-02-05
XIDIAN UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to propose a color image blind color image resistant to printing and scanning based on the statistical characteristics of DCT coefficients in view of the shortcomings of the existing anti-printing and scanning image watermarking algorithm, such as low embedded capacity, poor robustness, and non-blind watermark extraction mode. watermark method

Method used

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  • Method for preventing color image blind watermarking from being printed and scanned based on DCT coefficient statistical property
  • Method for preventing color image blind watermarking from being printed and scanned based on DCT coefficient statistical property
  • Method for preventing color image blind watermarking from being printed and scanned based on DCT coefficient statistical property

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Experimental program
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Effect test

Embodiment 1

[0037] Contrast of specific implementation steps of color image watermark embedding figure 1 ,Described as follows:

[0038] Step 1, watermark information preprocessing.

[0039] The binary watermark image to be embedded is subjected to Arnold scrambling, and the scrambled image is arranged into a one-dimensional sequence by row first to obtain the 01 watermark sequence to be embedded.

[0040] Step 2, texture mask calculation.

[0041] Obtain the blue component map of the color image, and calculate the texture mask value of each point of the blue component, denoted as m(i, j).

[0042] m ( i , j ) = | x ( i , j ) - x _ ( i , j ) | ,

[0043] ...

Embodiment 2

[0057] Comparison of specific implementation steps for watermark extraction of color images image 3 ,Described as follows:

[0058] Step 1, get the blue component of the color image.

[0059] Step 2, block operation and coefficient statistics.

[0060] Embed step 3 with color image watermark.

[0061] Step 3, watermark sequence extraction.

[0062] Calculate the mean value of each group of coefficients and compare it with 0. If it is greater than 0, the watermark bit is 1; if it is less than 0, the watermark bit is 0, so that the extracted one-dimensional 01 watermark sequence is obtained.

[0063] Step 4, binary watermark image generation.

[0064] Rearrange the watermark sequence obtained in step 3 into a two-dimensional image, and perform inverse scrambling transformation to obtain the extracted binary watermark image.

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Abstract

The invention discloses a method for preventing a color image blind watermarking from being printed and scanned based on a DCT coefficient statistical property. The method mainly solves the problems that in the traditional algorithm, the watermarking embedding capacity is low, robustness is poor, non-blind extraction mode is adopted, and the like. According to the method, the character that the mean value of intermediate frequency coefficients of image blocks in DCT transformation in statistics is approximately equal to zero, positive and negative offset is carried out on the coefficients according to embedded watermarking positions, self-adaptation adjustment is carried out on watermarking embedding strength according to image textural features, and therefore watermarking information can be embedded in a blue channel of a color image. In the process of watermarking extraction, only block DCT transformation on blue elements of the image is needed, the mean value of the corresponding intermediate frequency coefficients is counted and compared with zero, and therefore information of the embedded watermarking can be obtained. Compared with the traditional algorithm for preventing the image watermarking from being printed and scanned, the method has the advantages that under the precondition that high invisibility and high robustness of the watermarking are guaranteed, the watermarking embedding capacity is improved, blind extraction is achieved, and the embedded watermarking information is strong for printing, copying and scanning channels.

Description

technical field [0001] The invention belongs to the technical field of digital watermarking and relates to the embedding and extraction of color image watermarking information. Specifically, it is a blind watermarking method based on the statistical characteristics of DCT coefficients for color images against printing and scanning attacks. This method achieves good visual effects under the premise of ensuring strong robustness and large embedding capacity, and the embedded watermark information Robust to print scan channels. Background technique [0002] In recent years, with the advancement of high-quality digital input and output technology, and the widespread use of digital cameras, video recorders, scanners and printers, especially the popularization of high-precision color laser printers and scanners, people's lives and work It brings a lot of convenience, but it also makes it very easy to tamper or forge various certificates, product packaging, securities, checks and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T9/00
Inventor 王泉罗楠杨鹏飞潘蓉郑海红
Owner XIDIAN UNIV
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