Anti-collusion digital fingerprinting method based on code division multiple access and diversity technology

A diversity technology and code division multiple access technology, which is applied in the field of anti-collusion digital fingerprints, can solve the problems of satisfactory detection accuracy and low detection complexity for those who cannot conspire

Inactive Publication Date: 2010-10-27
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This scheme does not require relevant calculations when detecting colluders, and the detection complexity is low, but when the number of colluding users is large, many innocent people will be judged as colluders
[0009] To sum up

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  • Anti-collusion digital fingerprinting method based on code division multiple access and diversity technology
  • Anti-collusion digital fingerprinting method based on code division multiple access and diversity technology
  • Anti-collusion digital fingerprinting method based on code division multiple access and diversity technology

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Embodiment

[0086] In this embodiment, a Lena grayscale image with a size of 512×512 is used as the original carrier, such as figure 1 As shown, it specifically includes the following steps:

[0087] 1) Generate buyer fingerprints: assign a unique user identification code to each digital product buyer.

[0088] In this embodiment, the user identification code is a two-level number (s 1 ,s 2 ), and 1≤s 1 ,s 2 ≤63, so the number of users that the fingerprint system can accommodate is equal to 63 2 =3969.

[0089] 2) Embedding the buyer's fingerprint: Before releasing the digital product, the user identification code is embedded into the original copy of the product by using the fingerprint embedding method to generate a copy containing the user identification code.

[0090] 2.1) Divide the image that needs copyright protection into 4 sub-pictures of equal size, the size of each sub-picture is 256×256, and the serial numbers of the 4 sub-pictures are as follows figure 2 As shown, the...

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Abstract

The invention relates to an anti-collusion digital fingerprinting method based on a code division multiple access and diversity technology, comprising the following steps of: distributing a user identification code consisting of multiple stages of numbers for each purchaser; dividing an original carrier image into sub-images when fingerprints are embedded, then embedding all stages of numbers of a user into local DCT (Discrete Cosine Transformation) coefficients of the sub-images in all the sub-images by adopting a CDMA technology; and when finding a dubious copy, by combining with the original carrier image, firstly, detecting all stages of numbers and fingerprint strength values corresponding to the numbers of the dubious user in each sub-image, then synthesizing detection results of all the sub-images by adopting a diversity technology, and accurately judging one collusion member. The invention has less influence on the quality of the carrier image, low complexity of collusion detection and high detection precision rate.

Description

technical field [0001] The invention relates to a method in the technical field of information processing, in particular to an anti-collusion digital fingerprint method based on code division multiple access (CDMA) and diversity technology. Background technique [0002] The rapid development of information technology has expanded the scope of all kinds of text, pictures, film and television works through the network transmission unprecedentedly. How to carry out copyright protection for digital products has become one of the core issues of copyright protection in the information age. At present, some digital rights management (DRM) schemes have been proposed. These schemes are based on cryptographic means such as encryption and signature, to ensure the safe distribution of data, limit the illegal abuse of data, and prove the copyright. However, once the user obtains the digital media information, the protection of the information by DRM disappears immediately, which cannot ...

Claims

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Application Information

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IPC IPC(8): G06F21/00H04B1/707G06T1/00G06F21/16
Inventor 张爱新李建华郑旭平李生红张继昊金波王翔宇
Owner SHANGHAI JIAO TONG UNIV
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