Multi-Bit Reversible Data Hiding with Prediction and Difference Alteration

Reversible data hiding belongs to one of the applications of digital rights management (DRM). Among the DRM applications, watermarking or data hiding techniques work along with encryption algorithms. Nowadays, people tend to capture images with smart phones, and then they can transmit the images online instantly. Therefore, DRM relating issues can be directly applicable to protect the copyright of multimedia contents, and methods with reversible data hiding have also been developed. For reversible data hiding, we can look for the marked quality of multimedia contents, the number of secret bits for embedding, and the overhead for decoding to serve as performance assessments. We employ prediction techniques to produce the predicted image, and then to calculate the differences between original image and predicted one. We embed multiple bits at a time based on the characteristics of images to look for enhanced amount of capacity. Simulation results have pointed out the enhancement in embedding capacities, and the improvements in overall performances over relating methods in literature.