Abstract
Difference expansion (DE) has been widely used for reversible data hiding. In this paper, a novel transform which embeds two bits of information in a triplet of coefficients is presented. This transform can be applied in spatial or frequency domains and induces minimum distortion to the initial data or coefficients. The proposed method outperforms all similar DE methods using triplets in terms of computational cost, visual quality and bitrate.
Acknowledgements
This work was funded by the European Union – European Social Fund (75%), the Greek Government – Ministry of Development – General Secretariat of Research and Technology (25%) and the Private Sector in the frames of the European Competitiveness Programme (Third Community Support Framework – Measure 8.3 – programme – contract no.03EΔ832).