Reversible image data hiding based on scalable difference expansion

Reversible image data hiding technology can not only ensure that the receiver can extract the hidden data like the traditional data hiding technology, but also restore all the pixel values of the original image. Among the existing reversible image data hiding technologies, the method based on differential expansion is the most popular one. In the classical differential expansion method, a bit of data is hidden in the expanded difference of a pair of pixel values. However, expanding difference of different pixel pairs may have different effects on the fidelity of the host image, and some may cause pixel value overflow.