Reversible double-watermark scheme suitable for color image

Abstract

The invention relates to a reversible double-watermark scheme suitable for a color image. The reversible double-watermark scheme comprises the processes of embedding of a robust watermark, extraction of the robust watermark, embedding of a fragile watermark, extraction of the fragile watermark and image recovery. The robust watermark embedding process comprises the steps of generating an embedding position map by using a pre-embedding method, increasing robustness by using integer wavelet transform, and embedding a robust watermark by using a differential histogram translation method; the robust watermark extraction clock comprises the step of extracting the watermark by using inverse integer wavelet transform and differential histogram translation; when the fragile watermark is embedded, a hash sequence is used for generating the fragile watermark, and the fragile watermark is embedded in a block prediction error expansion mode; and hash sequences are compared during fragile watermark extraction, if the Hash sequences are consistent, watermark image recovery is carried out, and if the Hash sequences are not consistent, a tampering detection positioning image is generated, and a tampering position is positioned.

Description

technical field [0001] The invention belongs to the field of image digital watermarking and relates to a color image reversible double watermarking scheme. Background technique [0002] The development of Internet technology has enabled digital multimedia to be disseminated to everyone in real time through the Internet. Digital media and traditional media complement each other and profoundly affect people's lives. In the digital world, even non-professional users have access to many tools for working with digital images. Due to the variety of means of copyright destruction, the process of rights protection is often complicated. The reason for this is that the copyright owner did not take effective measures to prevent infringement in advance. Digital watermarking has been recognized as an effective method to ensure the authenticity and integrity of images. [0003] At present, watermarking technology can be divided into zero watermarking, reversible watermarking and irrev...

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Problems solved by technology

[0005] In order to solve the problem that the watermarking scheme has a single function, it will cause distortion to the image, and the robustness of the reversible scheme is poor, the present invention provides a reversible double watermarking scheme for color images

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