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Electronic stamp certification method based on image features

An authentication method and electronic seal technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of false authentication attacks, positioning accuracy and robustness to be improved, etc.

Inactive Publication Date: 2008-07-02
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, watermark-based authentication methods mostly use image-independent watermarks, which are vulnerable to false authentication attacks, and the positioning accuracy and robustness need to be improved.

Method used

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  • Electronic stamp certification method based on image features
  • Electronic stamp certification method based on image features
  • Electronic stamp certification method based on image features

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Embodiment Construction

[0038] The method of the present invention will be further described below in conjunction with the accompanying drawings.

[0039] The method of the present invention is divided into two processes of watermark embedding and seal authentication. The steps of the watermark embedding process are as follows:

[0040] 1. Preprocess the original seal

[0041] Pixel overflow is one of the factors that affect the robustness of the watermark. Generally speaking, the greater the proportion of critical pixels in the image, the higher the probability of pixel overflow after the watermark is embedded, and the greater the impact on the robustness of the watermark. From the statistics of the histogram, it can be seen that the gray scale of the seal image has a large proportion of pixels near 255, which is easy to overflow in the watermark embedding process and image processing process. The preprocessing of the seal image in the present invention is shown in the following formula.

[0042] ...

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Abstract

The invention relates to an electric stamp checking method, based on image character, wherein said invention combines the image character of stamp and the semi-fragility watermark; the invention first pretreats the original stank image, then extracts the character of stamp as the watermark to be embedded into stamp image; when the stamp needs identification, extracting watermark, to judge if the error between the watermark and the character of checked stamp is in acceptable range, to confirm if the stamp is reliable; if it is not, confirming the position that changed maliciously. The invention can correctly judge the treatment on stamp is malicious or normal, and accurately position the changed position, belonging to the multimedia signal processing technique.

Description

Technical field [0001] The invention belongs to the technical field of multimedia signal processing, and specifically relates to an electronic seal that combines the characteristics of a seal image and a semi-fragile watermark, can correctly determine whether the processing of the electronic seal image is malicious tampering or normal image processing, and can accurately locate the tampered position. Seal authentication method. Background technique [0002] Electronic seal is a new technology proposed in response to the development of the times. It can not only make up for the shortcomings and defects of traditional seals, but also with the rapid development of e-commerce and e-government, the use of electronic seals will become more and more widespread. However, the seal may be deliberately tampered with during network transmission, so its authenticity must be confirmed when it is used, otherwise it will bring serious consequences. How to effectively protect the authenticity and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 刘红梅饶俊慧黄继武
Owner SUN YAT SEN UNIV
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