An Improved Robust and Adaptive Watermarking Algorithm Based on DCT

Abstract

This paper proposes an improved watermarking algorithm based on DCT(Discrete Cosine Transform). We carried

out the algorithm as described as follows. First, we extended both rows and ranks of the watermark by using the

proposed method before the embedding stage. After expansion, Sine chaotic system is employed in encrypting the

watermark. In the embedding stage, an effective and adaptive embedding method is proposed to embed the

watermark into the blocked DCT coefficients. Experimental results demonstrate that the proposed algorithm in this

paper works well in resisting both geometry attack and noise attack. It also does well in recovering the watermark after

stego image suffered from JPEG compression.