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Digital image hash signature method

A digital signature and digital image technology, applied in image data processing, image data processing, user identity/authority verification, etc., can solve the problems that digital image signatures are easy to forge, and the length of signatures cannot be tampered with, so as to achieve good robustness, Easy to manage, good conflict-free effect

Inactive Publication Date: 2008-01-09
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to provide a digital image hash signature method to solve the common defects in digital image signatures such as easy forgery, inability to tamper with positioning and not very short signature length

Method used

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Embodiment Construction

[0052] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] In Embodiment 1, the digital image hash signature method of the present invention includes digital signature generation, digital signature matching and tampering location.

[0054] As shown in Figure 1, the generation of digital signatures includes:

[0055] Step 10, performing discrete cosine transform (DCT) of 8×8 blocks on the digital image to obtain DCT coefficients. The DCT coefficient is a matrix of size 8×8, the first coefficient (the first row and the first column) in the matrix is ​​a direct current (DC) coefficient, and the other coefficients are called alternating current (AC) coefficients. The reason why the present invention researches the digital signature algorithm on the DCT compression domain is because the current popular MPEG and H.264 video compression standards are all based on the DCT compression domain, researchin...

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Abstract

This invention discloses a HTS method for digital images composed of generation of digital signature, the match of digital signature and juggle locating, in which, the generation includes: 1, requiring for DCT coefficient, 2, quantizing the DCT low frequency coefficient to get its data matrix, 3, carrying out standard and main part analysis to the DCT data matrix to get a character vector matrix and a character vector value, 4, quantizing the character vector matrix and character value vector to generate signature, the digital signature match includes: 5, counter-quantizing the character vector matrix, 6, computing the similarity, 7, comparing the similarity with a valve value to decide if the match should be done, the juggle locating includes: 8, requiring for the new coordinate matrix of the being test image, 9, evaluating the new coordinate matrix of the original image, 10, computing the vector matrix of the difference of th being tested image and the corresponding block of the original image, 11, computing the HTS vector by the character value vector of the being tested image, 12, determining position of the juggle block.

Description

technical field [0001] The invention relates to a digital signature method, in particular to a digital image hash signature method. Background technique [0002] With the rapid development and wide application of multimedia technology and network technology, digital multimedia information (image, video, audio, etc.) colorful multimedia information. Governments, enterprises, and individuals are gradually using the Internet as the main means of communication. A large number of important documents and personal information are stored and transmitted in digital form, and e-commerce provides various services through the Internet. In the wireless field, with the evolution of mobile networks from the second generation to the third generation, mobile users will be able to access digital media content on the Internet conveniently and quickly, and the application of digital media content based on wired or wireless networks will soon become a new trend in the information age. Traditio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/32G06T1/00
Inventor 唐胜李锦涛张勇东
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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