LSB Matching Steganography Preserving Pixel Difference Histogram

The pixel difference distributions steganalysis utilizes the abnormality of pixel difference histogram to detect the LSB (least significant bit) matching steganography. In order to resist this steganalysis, a novel LSB matching steganography is proposed by preserving the pixel difference histogram of stego-image. In this steganographic method, we constructed the cost function related to the variation of pixel difference histogram and the number of zero difference values. If the secret bit equals the LSB of pixel, the pixel value remained unchanged; if not, the pixel value was increased or decreased by 1 according to the cost function value. The simulation results have demonstrated that the LSB matching steganography preserving pixel difference histogram is immune to the pixel difference distributions steganalysis at the expense of a little payload.