Color image watermark embedding and extraction method based on fractional order hyper-chaos and discrete wavelet transform-singular value decomposition (DWT-SVD)

Abstract

The invention discloses a color image watermark embedding and extraction method based on fractional order hyper-chaos and discrete wavelet transform-singular value decomposition (DWT-SVD). The method includes: firstly, utilizing a fractional order hyper-chaos system to encrypt a color watermark image W0 to obtain an encrypted image W1; then converting the encrypted image W1 and an original color image I0 from RGB space to YIQ space to obtain images W2 and I1 respectively, and separating Y, I and Q components of the image; performing wavelet transform on components of the image I1 repeatedly, performing singular value decomposition on obtained low-frequency sub-bands, using components of the image W2 as watermark information to be embedded in corresponding singular values, and performing singular value decomposition on changed singular values again; and finally obtaining a color image with embedded watermark through wavelet inverse transformation and color space conversion. The color image watermark embedding and extraction method enhances imperceptibility, safety and abundant information of a watermark, has the advantages of being high in safety, strong in robustness, large in copyright information and rapid in arithmetic speed, and has strong application value.

Description

technical field [0001] The invention relates to the field of image watermarking in information security, in particular to a color image watermark embedding and extraction method based on fractional hyperchaos and DWT-SVD (discrete wavelet transform-singular value decomposition). Background technique [0002] The rapid development of computer network and communication technology has made the dissemination of digital media (image, audio, video) more and more convenient, and the problems of information security, copyright protection and certification of digital media have become increasingly prominent. Traditional cryptography-based security measures are powerless against attacks such as illegal copying, forgery, tampering and copyright infringement. Digital watermarking technology emerges as the times require to protect digital products themselves and the interests of their original owners. On the other hand, compared with integer-order chaotic systems, fractional-order chaoti...

AI Technical Summary

Problems solved by technology

Whether it is a one-dimensional ID sequence watermark, or a binary image watermark or a grayscale image watermark, the defects are that the amount of intellectual property information contained in the watermark is small, and the security is poor; when embedding the watermark information, the locality of the image itself cannot be fully considered. Related characteristics and its human visual characteristics, the transparency and robustness of digital watermarking need to be further improved

Images