Performance study on block-based image steganalysis

Block-based image steganalysis, which uses smaller homogenous blocks from a given test image, was previously proposed to improve the steganalysis performance. Performance study on block-based image steganalysis in terms of block sizes and block numbers is conducted in this research. First, we analyze the dependence of the steganalysis performance on one of these two factors, and show that a larger block size and a larger block number will lead to better steganalysis performance. Our study is verified by experimental results. For a given test image, there exists a trade-off between the block size and the block number, and it is shown that a balance between the block size and the block number can result in better steganalysis performance.