Abstract:

 Contraposing the need of the robust digital watermarkfor the copyright protection field, a new digital watermarking algorithmin the non-subsampled contourlet transform (NSCT) domainis proposed. The largest energy sub-band after NSCT is selectedto embed watermark. The watermark is embedded into scaleinvariantfeature transform (SIFT) regions. During embedding, theinitial region is divided into some cirque sub-regions with the samearea, and each watermark bit is embedded into one sub-region.Extensive simulation results and comparisons show that the algorithmgets a good trade-off of invisibility, robustness and capacity,thus obtaining good quality of the image while being able to effectivelyresist common image processing, and geometric and comboattacks, and normalized similarity is almost all reached.