Information hiding technology based on block-segmentation strategy

This paper proposes an information hiding method based on block-segmentation strategy. The proposed scheme divides a grayscale image into several 4 times 4 blocks and further segment each block into four small blocks sized 2 times 2. Each small block chooses one reference point to be proceeded with outer embedding process. The chosen points then formed an inner block to be proceeded with inner embedding process for increasing hiding capacity. In addition, the proposed method effectively controls the distortion between the stego image and the original image by using remainder function. In the extracting phase, the proposed scheme subtracts the qualified reference point from each stego pixels to obtain the secret data. The proposed method does not need any extra information to extract the hidden information. According to the experiment results, the performances of the proposed scheme are better then that of Chang and Tseng´s scheme.