Two-layer fragilewatermarking method for enhanced tampering localisation

This paper presents a new fragile watermarking method, whereby a secure block-wise and an interlaced watermarking mechanisms are hierarchically structured to provide higher tampering localisation capabilities. The block-wise method provides security against conventional distortions, cropping, as well as sophisticated attacks, whereas the interlaced scheme is aimed at enhancing the localisation accuracy achieved by the block-wise method. Results are presented to illustrate the improved localisation capabilities of the proposed method in comparison with some five existing watermarking schemes.