We specifically address the problem of fragile digital watermarking for the tamper-proofing of still images. Applications of our problem include authentication for courtroom evidence, insurance claims and journalistic photography. We present a novel fragile watermarking approach which embeds a watermark in the discrete wavelet domain of the image by quantizing the corresponding coefficients.
Tamper detection is possible in localized spatial and frequency regions.
Doc 35 Watermarking digital images for copyright protection - 'O, Dowling et al. Doc 8 Digital watermarking - Delaigle, De Vleeschouwer et al.