Watermark embedding method of host image and watermark extraction method of watermarked image

Abstract

The invention discloses a watermark embedding method for a host image and a watermark extracting method for an image including a watermark. The watermark embedding method for the host image comprises the steps that (S101) when the pixel of the host image is judged to be not the power of two, the pixel is adjusted to be the power of two through pixel processing; (S102) when the pixel of the host image is judged to be the power of two, NSCT transformation is conducted on the host image to obtain an image multi-resolution coefficient, and a watermark image is compressed with a compressive sensing algorithm to obtain a sparse coefficient of the watermark image; (S103) the sparse coefficient is embedded in the image multi-resolution coefficient with an embedding algorithm, and a coefficient including watermark information is obtained; (S104) NSCT inverse transformation is conducted on the coefficient including the watermark information, and the image including the watermark is obtained. Through the watermark embedding method for the host image and the watermark extracting method for the image including the watermark, the imperceptibility and the robustness of the digital image watermark can be effectively improved.

Description

technical field [0001] The invention relates to watermark embedding and extraction, in particular to a watermark embedding method of a host image and a watermark extraction method of a watermarked image. Background technique [0002] The rapid development of information technology and digital technology facilitates the dissemination of digital works on the Internet, but this also brings challenges to the security of these works, which are easily used by pirates to obtain illegal benefits. Therefore, it is necessary to protect the copyright of digital works, and to investigate and punish the infringers. Digital watermarking is a copyright protection technology developed under this background. [0003] Digital watermarking is a new research direction in the field of information security and hiding technology, dedicated to the protection and maintenance of digital product copyright. This technology will have a mark (watermark) with a specific meaning, and use a certain embeddi...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention overcomes the imperceptibility and insufficient robustness of the watermark embedding of the host image in the prior art, and provides a watermark of the host image that can effectively improve the imperceptibility and robustness of the digital image watermark Embedding Method and Watermark Extraction Method of Watermarked Image

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