Robust Spread Spectrum Steganography Based on the Nonuniform DCT Characteristic
In existing image hiding Spread Spectrum (SS) algorithm a reduction of scaling parameter is employed to improve imperceptibility but may lead to an increase in secret information extraction errors. A robust SS steganography, based on the Nonuniform Discrete Cosine Transform (NDCT) characteristic, is proposed. If the secret information, embedded in the NDCT coefficient matrixes of every N×N host image, is a real symmetric matrix, the difference matrix between stego-image and host image is also a real symmetric matrix. Due to the NDCT characteristic above, based on some corresponding change of stego-image, the proposed robust SS algorithm can improve imperceptibility of stego-image and the scaling parameter was not reduced. Simulation results verify the feasibility and validity of the algorithm.
Helen Zhang, Gang Shen and David Jin
W. C. Chen et al., "Robust Spread Spectrum Steganography Based on the Nonuniform DCT Characteristic", Advanced Materials Research, Vols. 225-226, pp. 816-822, 2011