Electronic seal protection method based on fragile watermark

An electronic seal and watermark technology, applied in the field of information security, can solve problems such as difficult application, low sensitivity to changes in images to be embedded, and damage to legal validity, etc., to achieve the effect of improving fragility, protecting integrity and originality

Inactive Publication Date: 2012-06-27
KUNSHAN BAIRUN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the application of government documents and electronic official seals, due to the particularity of the seal itself, it is very sensitive to changes in its own design, and any slight changes will destroy its legal validity
However, when the digital watermark using the general spatial domain algorithm changes slightly in the embedded image, the watermark itself will not produce a large enough change, so it is impossible to use the ordinary spatial domain algorithm-based watermark to protect / distinguish the small changes in the embedded image
Although digital watermarking methods based on transform domain such as digital watermarking based on discrete cosine transform and digital watermarking based on discrete wavelet transform are excellent in terms of robustness and concealment, their algorithms are also not sensitive to changes in embedded images. High, and the method is very complicated and difficult to apply

Method used

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  • Electronic seal protection method based on fragile watermark
  • Electronic seal protection method based on fragile watermark
  • Electronic seal protection method based on fragile watermark

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for obtaining a digital watermark W and embedding the watermark W into an original image g, comprising the following steps:

[0021] 1) Starting from the first row and first column of the original stamp image g, the operation is performed pixel by pixel,

[0022] 2) Take out the red, green, and blue primary color values ​​of the current pixel, which are R, G, and B respectively;

[0023] 3) Take out the mapping result 0 or 1 corresponding to R, G, and B in the mapping table Table, and perform an XOR operation to obtain the operation result P;

[0024] 4) Take out the value of the pixel corresponding to the watermark image, and divide it by 255 to get the result W. Because the watermark is a binary image, the pixel value is 0 or 255, so after dividing by 255, it becomes 0 and 1 for the following comparison;

[0025] 5) If P=W, then jump back to step 2) to perform the calculation of the next pixel;

[0026] 6) If PW, randomly select one of R, G, and B, and mod...

Embodiment 2

[0030] For the method that the seal pattern that has embedded watermark extracts watermark, method of the present invention can take following mode, and step is as follows:

[0031] 1) Starting from the first row and first column of the stamp image, the operation is performed pixel by pixel,

[0032] 2) Take out the red, green, and blue primary color values ​​of the current pixel, which are R', G', and B' respectively;

[0033] 3) Take out the mapping result 0 or 1 corresponding to R', G', B' in the mapping table Table, and perform XOR operation to obtain the operation result P';

[0034] 4) Multiply the P' value by 255 to obtain the result W', which is the pixel value of the watermark pattern at this position;

[0035] 5) Jump back to step 2) to perform the calculation of the next pixel;

[0036] 7) Finally get the watermarked image.

[0037] For the method of embedding the watermark image into the original seal image, refer to the first embodiment above.

[0038] In the ...

Embodiment 3

[0061] Based on the specific steps of Embodiment 1 of the present invention, the applicant has taken screenshots of the same electronic document using the original seal and the electronic seal processed by the protection method of the present invention as schematic diagrams. It can be seen that using the Conservation method seals are visually consistent.

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Abstract

The invention discloses an electronic seal protection method based on a fragile watermark, which includes the following steps: 1, scanning an original seal image to a computer; 2, setting a mapping function f, enabling each pixel value of the image g obtained by scanning an original seal to be mapped into a two-value L, L (i, j) = fg (g (i, j)), wherein a value of the L is 0 or 1, and i and j are coordinates of image pixel points; and 3, embedding a watermark W in the seal scanning image g, wherein sigma is a positive integer which is as small as possible in a following formula. Each pixel value of the image g obtained by scanning the original seal is modified so as to enable a value of each pixel point in the modified image g to be the same as W after the value is calculated through the mapping function f. The electronic seal protection method based on the fragile watermark meets requirements of occasions which are hypersensitive to embedded images, and guarantees that as long as one pixel in a pattern embedded by a watermark is changed, the watermark can be damaged, thereby achieving verification and protection effects.

Description

technical field [0001] The invention relates to a method for protecting an electronic seal, in particular to a method for protecting an electronic seal based on a fragile watermark, and belongs to the field of information security. Background technique [0002] Digital watermarking is to add some digital signals to multimedia data (image, sound, video, etc.) to achieve the functions of document authenticity identification and copyright protection. Usually, the embedded digital watermark information is hidden in the target file and does not affect the observability of the original file. sex and integrity. With the advancement of electronic office, digital watermarking technology has also produced a great use in the authenticity verification of documents (printed materials, electronic documents, etc.). For example, for policy documents issued by government departments, the traditional method of document authentication is to identify whether the paper, seal or steel seal of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 许兆然张大年吕凡
Owner KUNSHAN BAIRUN TECH
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