Data Hidng in Digital Image Using Four Pixel-Value-Differencing and Multiple-Base Notational

In this paper, a novel image steganographic method with four pixel-value-differencing and multiple-base notational is proposed. It processes non-overlapping 2 × 2 pixels blocks, and the features of edge can be considered sufficiently. Secret data, dynamically expressed as different digits in multiple-base, are embedded into each four-pixel block by adaptively applying exploiting modification direction technique. The dynamical adjustment not only modifies the pixel values but also alters the embedded digit, guaranteeing to extract the secret data exactly and to minimize the embedding distortion. Compared with the previous method, experimental results show that the proposed method provides better performance, i.e., larger embedding capacity and better image quality.