Network image copyright real-time distinguishing method

Abstract

The invention provides a network image copyright real-time distinguishing method. Copyright protection is necessary for digital images during network communication, but the existing robust digital watermarking technology can not achieve the real-time copyright distinguishing. The method comprises the following steps: partitioning an original image to sub-blocks which are not overlapped with each other at an embedded end; processing each sub-block by discrete cosine transformation; generating a feature watermark by comparing the DC coefficient of each sub-block with the average DC coefficient of all sub-blocks; encrypting the Logistic chaotic sequence of the feature watermark; adjusting the magnitudes of two low-frequency coefficients of the discrete cosine transformation of each sub-blockand self-embedding the encrypted feature watermark; and processing each sub-block by inverse discrete cosine transformation to obtain images with watermarks. The method has high robustness to attack.Substantially, the method provided by the invention can achieve complete blind detection by combining the self-embedding encrypted feature watermark with watermark blind extraction and authentication, thereby achieving real-time copyright distinguishing of network images.

Description

technical field [0001] The invention relates to the field of information security. The invention designs a method for real-time identification of network image copyright, which can identify the copyright of digital images transmitted on the network in real time. Background technique [0002] The dissemination of digital images on the Internet is likely to cause copyright disputes, and copyright protection is required. Robust digital watermarking technology can be used to protect the copyright of digital images transmitted on the network. [0003] According to the content of watermarks, watermarks can be divided into meaningful watermarks and meaningless watermarks. Meaningful watermarks generally mean that the content of the watermark has specific meanings, such as binary images, grayscale images, trademarks, author's personal information, etc.; meaningless watermarks generally correspond to a pseudo-random sequence with no specific meaning. In addition, hot springs, etc....

AI Technical Summary

Problems solved by technology

Then, the embedding end transmits the original watermark or part of its information to the detection end (or a third-party notary center) for storage, which requires a certain amount of transmission and storage costs, and it is difficult to completely prevent passive attacks that are common on the Internet during the transmission process.

For example, if an attacker successfully "eavesdrops" on the transmitted original watermark or part of the information of the original watermark, the embedded watermark can be obtained through analysis, and the watermark can be further forged and passed to the detection end, which will make the real original watermark unable to be used to identify the copyright, reaching Interfere with the purpose of copyright identification, making the watermark algorithm unable to resist interpretation attacks [12]

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