Image digital fingerprint tracing method

A digital fingerprint and fingerprint technology, applied in the field of digital content security protection, can solve the problems of limited digital fingerprint carrier capacity, low tracking success rate, hindering the practical application of digital fingerprints, etc., achieve good versatility and practicability, improve performance, improve The effect of tracking success rates

Inactive Publication Date: 2013-02-13
WUHAN UNIV
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AI Technical Summary

Problems solved by technology

[0015] However, the capacity of the digital fingerprint carrier used in the traditional method is limited, the possible collusion attacks and robustness attacks are various, and the overall tracking success rate is low, which hinders the further practical application of digital fingerprints.

Method used

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Embodiment Construction

[0035] The present invention notices that the robustness of information embedding is different at different positions of the DCT coefficients, and the DC coefficients often have high robustness. In the face of attacks such as compression processing and noise filtering, the DC coefficients are more robust than other intermediate frequency coefficients. Possess good anti-attack ability. At the same time, due to the different image content and texture characteristics, the robustness of different DCT coefficients is different to a certain extent. After the space-time domain image is converted into DCT coefficients by DCT transformation, it has the following characteristics in each 8×8 block:

[0036] 1) In general, the DCT coefficients (absolute value) decrease sequentially from the upper left to the lower right. The low-frequency coefficients of an image are distributed in the upper left corner, and the high-frequency coefficients are distributed in the lower right corner. The ab...

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Abstract

The invention belongs to the technical field of digital content security protection, and discloses an image digital fingerprint tracing method particularly for piracy source tracing for digital works. The method comprises the following steps of: considering the difference of the robustness of each position of a DCT (Discrete Cosine Transformation) domain, before embedding a digital fingerprint into an image carrier, firstly, testing an extraction accuracy rate for each position of the DCT domain, and selecting the position with a higher extraction accuracy rate for embedding the fingerprint; while executing digital fingerprint piracy source tracing, according to the difference of the extraction accuracy rate of each position of the DCT domain, assigning different weights for fingerprint correlation degree matching coefficients of different positions, and calculating a user correlation degree. The scheme can effectively improve the success rate of piracy source tracing for a fingerprint system. The technical scheme provided by the invention has better universality and practicability, and can be suitable for fingerprint schemes of various transformation domains, and the idea can be further popularized in various audio and video fingerprint embedding schemes.

Description

technical field [0001] The invention belongs to the technical field of digital content security protection, in particular to an image digital fingerprint tracking method that can be used for tracking the source of digital work piracy. Background technique [0002] In recent years, the rapid development of information technology has enabled the rapid dissemination of digital works such as various texts, images, and film and television works through the Internet, bringing opportunities for creators and distributors of works. At the same time, it is easy for people to illegally modify, copy and distribute digital products. As the last barrier of copyright protection, digital fingerprint technology has been paid more and more attention by scholars at home and abroad. It embeds unique fingerprint information related to the user in each copy of the protected work distributed, making each copy different. When the publisher discovers an illegal copy, it can extract the fingerprint...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00G06F21/16
Inventor 任延珍黄轩彭敏牛晓光
Owner WUHAN UNIV
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