Spatial domain color digital image blind watermarking method fusing discrete Fourier transform

Abstract

The invention discloses a spatial domain color digital image blind watermarking method fusing discrete Fourier transform, and the method combines the advantages of high operation speed of a spatial domain digital watermarking algorithm and high robustness of a frequency domain digital watermarking algorithm. According to the unique characteristics of the discrete Fourier transform direct current components, the correlation principle between the direct current components of the adjacent pixel blocks is utilized, different quantization step lengths are adopted in different channels, the embedding and blind extraction of digital watermarks are completed in the airspace, and real discrete Fourier transform is not needed. According to the invention, a color digital watermark image is embedded into a color carrier image; on the premise that the watermark invisibility is good, the watermark robustness and the algorithm real-time performance are high, the problems that a large-capacity color image digital watermark algorithm is low in operation speed and poor in robustness are solved, and the method is suitable for occasions where digital media copyright protection is conducted rapidly andefficiently.

Description

technical field [0001] The invention belongs to the technical field of network space security, and relates to the copyright protection of color digital images as digital watermarks. Background technique [0002] With the rapid development of the Internet and multimedia technology, efficient storage and transmission of digital information has become possible. However, when various digital products are transmitted on the Internet, a series of problems such as piracy, infringement, and tampering have also arisen. Therefore, the issue of digital copyright protection has attracted more and more attention from scholars at home and abroad. Digital watermarking technology emerged as an effective digital product copyright protection and data security maintenance technology. Digital watermark technology can use certain embedding methods to embed the digital watermark as identification information into the digital carrier, and it is not easy to detect visually, so as to effectively pr...

AI Technical Summary

Problems solved by technology

[0003]According to the different processing methods of the carrier image, the digital watermarking algorithm is divided into the spatial domain watermarking algorithm and the frequency domain watermarking algorithm. The former has the advantages of simple calculation and fast operation speed, but the The robustness is relatively poor, and although the latter has the advantages of strong robustness, the running time of the algorithm is long and the real-time performance is poor

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