Abstract
Digital watermark technology hides copyright information in digital images, effectively protecting the copyright of digital images. At present, the color image digital watermarking algorithm still has defects such as the inability to balance robustness, invisibility and the weak anti-attack ability. Aiming at the above problems, this paper studies the digital watermarking method based on discrete wavelet transform and discrete cosine transform. Then this paper proposes a color image blind digital watermarking algorithm based on QR code. First, convert the color image from RGB space to YCbCr space, extract the Y component and perform the second-level discrete wavelet transform. secondly, block the LL2 subband and perform the discrete cosine transform. finally, use the embedding method to convert the watermark information after the Arnold transform embedded in the block. The experimental results show that the PSNR of the color image embedded with the QR code is 56.7159 without being attacked. After being attacked, its PSNR and NC values are respectively 30dB and 0.95 or more, which proves that the algorithm has good robustness and can achieve watermarking blind extraction.
Highlights
Regarding the copyright protection and copyright authentication of digital media products, the traditional copyright protection method is information encryption, which processes digital information through a certain mathematical method, so that it cannot be correctly identified without knowing the encryption method and key
Whether the performance of digital watermarking algorithm reaches the standard of research and application is mainly judged by two aspects: one is the invisibility of watermark, which is evaluated by subjective evaluation of human eyes or quantitative calculation of objective methods
The second is the robustness of watermark, that is the watermark resistance to attack, which means whether the watermark image can extract effective watermark information after being attacked
Summary
With the development of the Internet, various digital works have appeared on the Internet. With the rapid development of information digitization, there has been a problem that copyright is not easy to protect[1]. Information encryption protects copyright to a certain extent, but traditional information encryption methods will disrupt encrypted information and cause damage to digital information[2]. As a method of solving copyright protection problems, digital watermarking is a technology that embeds designated digital identification information into digital products transmitted over the network to protect product copyrights and does not affect the use of digital products[3]. The content of the watermark can be the name of the work, creation time or corporate identity, etc. The watermark content can prove the copyright owner and can be used as proof of copyright protection. According to different embedding methods, it can be divided into spatial domain
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