A reversible data hiding scheme using complementary embedding strategy
Obtaining good visual quality and high hiding capacity with reversible data hiding systems is a technically challenging problem. In this paper, we propose a simple reversible data hiding scheme that uses a complementary hiding strategy. The proposed method embeds one secret bit horizontally and vertically into one cover pixel of a grayscale cover image by decreasing odd-valued pixels and increasing even-valued pixels by one. Experimental results show that the hiding capacity measured by bit per pixel (bpp) of the proposed scheme is at least 1.21bpp with a PSNR (peak signal-to-noise ratio) value greater than 52dB for all standard test images. Especially in the case of four-layer embedding, the PSNR value of the proposed method is still greater than 51dB at a hiding capacity of about 5bpp for all standard test images. In addition, the proposed method is quite simple because it primarily uses additions and subtractions. These results indicate that the proposed scheme is superior to many existing reversible data hiding schemes introduced in the literature.
reversible data hiding data embedding information hiding watermarking steganography