The large capacity embedding algorithm for H.264/AVC intra-prediction mode video steganography based on linear block code over Z4

Abstract

The H.264/AVC intra prediction video steganography based on (n,k) linear block code over ring Z4 is proposed by this paper. On the basis of (n,k) linear block code over Z4, the property of addition of abelian groups and multiplicative commutative semigroup are utilized to generate the steganography code. Lee distance of linear codes over ring Z4 is researched, and it makes the equation has unique solution. Furthermore, the optimal performance of the proposed code is proved. The code performance with high embedding rate whose upper bound of embedding rate is reached to 1.33bpp, and the code is applied to video steganography based on intra-prediction mode (IPM-based video steganography). It obtains better performances of security and anti-attack. The average distortion is decreased to 50% and the detection accuracy is decreased to 3-5% with identical embedding rate. Experimental results show that the performance of the proposed scheme is superior to those of the former IPM-based schemes.