Image watermark embedding method and extraction method, and related methods

Abstract

The present invention discloses an image watermark embedding method, an image watermark extraction method, a digital media copyright protection method and a digital media copyright tracing method. The image watermark embedding method comprises: converting a watermark into a watermark binary sequence as required; carrying out a key-based spread spectrum operation on the watermark binary sequence, so as to determine a spread spectrum watermark vector; carrying out adaptive segmentation on a to-be-watermarked image; based on the adaptive segmentation, carrying out multistage discrete cosine transform on the to-be-watermarked image, so as to determine a first transform coefficient matrix; based on the first transform coefficient matrix, constructing a feature vector, and embedding the spread spectrum watermark vector into the feature vector; and carrying out coefficient reset, inverse discrete cosine transform of the coefficient matrix, and the like on the feature vector embedded with the spread spectrum watermark vector, so as to determine the watermarked image. According to the methods disclosed by the embodiments of the present invention, invisibility, robustness and security of the watermark are improved, and risk that the watermark is recognized and erased maliciously is weakened.

Description

technical field

[0001] The embodiments of the present invention relate to the technical field of digital media copyright protection, in particular to an image watermark embedding method, an image watermark extraction method, a digital media copyright protection method, and a digital media copyright tracking method. Background technique

[0002] In recent years, with the rapid development of Internet technology and digital media technology, there are a large number of digital media content resources (such as text, images, audio and video, etc.) Media content is copied, modified, disseminated and used. Therefore, the copyright protection of digital media content has attracted more and more attention from academic and commercial circles. In the process of solving this problem, adding watermark to digital media content is a widely used technical means. Digital watermarking technology is to embed the identifier representing its copyright information into the digital media conten...

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