A Novel Multipurpose Watermarking Scheme for Copyright Protection and Content Authentication

novel multipurpose image watermarking algorithm for copyright protection and content authentication is proposed in this paper. The basic idea is to embed robust and fragile watermarks into different components of gray scale image simultaneously. Based on chaotic maps and nonuniform discrete Fourier transform (NDFT), the robust watermark is firstly embedded into the middle frequency coefficients of NDFT domain by odd-even quantization method; in succession the fragile watermarks are embedded into LSB and less LSB planes according to chaotic stochastic sequence. Simulation results show that the robust watermark has a strong robustness to common image processing operations and the fragile watermarks have ability to discriminate tamper type of watermarked image and capability of tampering restoration.