An improved steganographic method of product perfect codes

Recently, product perfect codes (PPC) steganographic method was proposed by H. Rifa-Pous and J. Rifa, which can achieve large embedding efficiency with less distortion. They divided the cover image into disjoint matrix blocks and apply F5 algorithm in each row and some columns. The proposed method in this paper improves the PPC embedding method. F5 algorithm was also utilized in each row, but to the columns, an efficient method combining exploiting modification direction (EMD) and wet paper codes (WPC) was applied. New steganographic methods can provide higher embedding rate when concealing with the same distortion. The proposed method is better than the original PPC method.