Image hiding based on block difference

In this paper, a novel image hiding scheme based on block difference is proposed to hide a secret-image into a cover-image such that an unintended observer will not be aware of the hidden secret-image. By exploring the property of block difference between the cover-image and the secret-image, the image quality of the resulting stego-image can be greatly improved. Experimental results demonstrate that the resulting stego-image has high peak signal-to-noise ratio and the visual quality of the stego-image is indistinguishable from the original cover-image.