A Study of High Capacity Image Steganographic System

With the development of mobile communication and internet technologies digital media can be transmitted conveniently over the network. In this process the algorithms used to protect secret messages during transmission become an important issue. This paper presents a new high capacity image steganograpic model based on discrete cosine transform (DCT), vector quantisation (VQ) and a pseudo random number generator (PRNG). The proposed new system can embed more information than traditional algorithms without compression. The recovered hiding image has high peak signal to noise ratio (PSNR) value and good visual quality. This system is robust in terms of both JPEG compression and other signal processing attacks.