High-capacity reversible data hiding in encrypted images by prediction error

摘要: In recent years, signal processing in encrypted images received much attention from academia due to the privacy preserving property. Reversible data hiding is a technique that embedded additional into an image without accessing content of original image, can be extracted and recovered one. this paper, two reversible methods images, namely joint method separable method, are introduced by adopting prediction error. extraction reconstruction performed at same time. The reversibility, number incorrect bits significantly improved while maintaining good visual quality especially when embedding rate high. recovery separated. also provides reversibility for high payload embedding.