HT-IWT-DCT-Based Hybrid Technique of Robust Image Watermarking

摘要

Nowadays, several malpractices are performed for violating integrity of digital multimedia. In this paper, a hybrid technique of image watermarking is proposed which finds its potential capability to overcome this issue. The proposed scheme efficaciously uses homomorphic transform (HT), integer wavelet transform (IWT), discrete cosine transform (DCT) along with singular value decomposition (SVD). Selection of reflectance component of the host image for watermark embedding ensures that robustness and imperceptibility are achieved concurrently. Embedding of watermark is done by modifying it with singular values (S V) of LH subband of the host image. The proposed scheme is highly robust and imperceptible as numerous performance metrics attain high values under attacks. Performance of the proposed algorithm is compared with other formerly reported techniques and it is found that the developed scheme is superior over them.