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Method for adding blind watermark to electronic contract

An electronic contract and blind watermarking technology, applied in the field of image processing, can solve problems such as strengthening the security of electronic contracts, and achieve the effect of good robustness and high concealment.

Pending Publication Date: 2022-05-10
浪潮卓数大数据产业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the security of electronic contracts still needs to be further strengthened

Method used

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  • Method for adding blind watermark to electronic contract
  • Method for adding blind watermark to electronic contract

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Embodiment Construction

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection of the present invention. scope.

[0029] The present invention adds blind watermarks to electronic contracts based on the FFT algorithm, which is the application of the Fourier algorithm in the field of image processing. Compared with the DFT algorithm, the FFT algorithm utilizes the periodicity and symmetry of the rotation factors in the Fourier transform to convert the The time comple...

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Abstract

The invention provides a method for adding a blind watermark for an electronic contract, which belongs to the field of image processing, and comprises the following steps: transforming an original image from a spatial domain to a frequency domain, then coding the watermark, adding the coded watermark into the frequency domain information of the original image, and then carrying out IFFT (Inverse Fast Fourier Transform) on the merged frequency domain information to obtain a final watermark image. When a copyright problem dispute occurs, the authenticity of the electronic contract is verified through decryption.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method for adding blind watermarks to electronic contracts. Background technique [0002] Blind watermarks refer to watermarks that are imperceptible to humans, and are mainly used in audio-visual works, digital books, etc. The purpose is to protect and track copyrights without destroying the original works. The method of image watermarking can be divided into spatial domain method and frequency domain method. Adding digital watermarking in the spatial domain refers to directly operating the image in space, such as directly superimposing the watermark on the original image. Adding watermark in the frequency domain refers to transforming the image into the frequency domain through some kind of transformation, such as fast Fourier transform, discrete cosine transform, wavelet transform, etc., adding watermark to the image in the frequency domain, and then converting the image into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 周永杰单震徐宏伟
Owner 浪潮卓数大数据产业发展有限公司