A Robust Spread Spectrum Watermarking Technique For Color Images Based On DCT Resistant JPEG Compression

摘要

This paper presents a secure, low complexity and fast watermarking scheme based on Discrete Cosine Transform (DCT) for color images which provides robustness against JPEG compression. A popular method used for additive watermarking is spread spectrum. It consists in adding a spread signal into the host image. This signal is obtained by the sum of a set of carrier vectors (or pseudo random codes), which are modulated by the bits to be embedded. To extract these embedded bits, weighted correlations between the watermarked image and carriers are computed. In this paper we use gold sequences of length 2047 lead to a great improvement of extraction performance in term of peak signal-to-noise ratio (PSNR) and/or watermark robustness. The results presented in this paper are convincing and truly demonstrate the robustness of our watermarking method to JPEG compression.