Multiresolution fragile watermarking using complex chirp signal for content integrity verification

This paper proposes a wavelet-domain multiresolution fragile watermarking scheme using an improved Quantization-Index-Modulation (QIM) embedding technique. A secure embedding zone is exploited in our proposed scheme to reduce the false detection rate of Kundur's scheme. The frequency modulated (FM) complex chirp signal is employed as watermark. Both the real and the imaginary parts of the chirp signal are embedded simultaneously in a hierarchical manner. Unlike the conventional schemes, the proposed scheme does not require the original watermark for content integrity verification. The blind authentication process allows embedding of arbitrary FM chirp watermarks.