Robust image watermarking algorithm based on DWT and DCT

Abstract

To address the current problem of frequent piracy infringement of digital images, this paper proposes an image watermarking algorithm based on DWT and DCT. Firstly, the binary watermark is encrypted by the logistic chaos algorithm, which produces a chaotic sequence with better uncertainty and initial value sensitivity; secondly, the Arnold transform is applied to the encrypted watermarked image to eliminate the correlation between the watermarked pixels, so that the robustness of the image information is improved; the original image is decomposed by the second-level wavelet in the embedding process, and then the low-frequency sub-band LL1 is blocked In the embedding process, the original image is decomposed by the second-level wavelet, and then the low-frequency sub-band LL1 is chunked, and the pre-processed watermark information is embedded by modifying the IF coefficients through DCT transform. In this paper, Matlab simulation experiments are conducted for this algorithm, and the experimental results have good invisibility and good robustness when subjected to various malicious attacks, which is practical for safeguarding digital image copyright.