A SVD-based color image watermark algorithm in DWT domain

Abstract

A color image watermarking algorithm based on SVD and DWT is proposed. First, watermark image is preprocessed by Arnold transform to improve algorithm security. Second, the low-frequency component of blue subgraph coefficients extracted from a host image decomposed by 2-DWT is analyzed by SVD. Then, the corresponding singular value of watermark image is embedded into the host image. Simulation results show that proposed method, guaranteeing algorithm high embedding capacity, has better performance in terms of invisibility and improves robustness significantly against a variety of noises, compression, shear and rotation, etc, attacks.