A novel hybrid image authentication scheme for AMBTC-compressed images

Abstract

A novel hybrid image authentication scheme is proposed in this paper to protect the integrity of images that are compressed by absolute moment block truncation coding (AMBTC). In this proposed scheme, all blocks of a compressed image are classified into two groups. For smooth blocks, the authentication code for each block will be embedded into the bitmap of each block. For complex blocks, the authentication code will be embedded into quantization levels of each block according to a reference table. The experimental results show that this proposed scheme achieves high image quality of the embedded image and almost 100 % detection precision when eb = 3.