On a low complexity steganographic system for digital images based on interpolation-error expansion

The main purpose of steganography is to hide the presence of communication process. Transparency is referred to the ability to avoid suspicion about the existence of a secret message. Several steganographic systems using digital images as host signals have been proposed. However, some of them such as frequency transform-based are computationally expensive. In this paper, a low complexity steganographic system for digital images is proposed. The core of the proposed system is an adaptation of the interpolation-error expansion technique. From experimental results the high perceptual and statistical transparency of the proposed scheme are shown. Moreover, the proposed system embedding rate is similar and some times outperforms the frequency transform-based embedding rate with lower computational complexity.