An improvement of image secret sharing and hiding with authentication

In recent years, researchers has proposed (t, n)-threshold image secret sharing and hiding schemes with authentication. The secret image is shared and hided into typical cover images to form the stego images so that to be transmitted securely. Unfortunately, there is a common week point that each stego image should be extended to 4/t times of the secret image. Recently, a (t, n)-threshold image secret sharing and hiding scheme with authentication is presented that the size expansion of the stego images reduced to 3.5/t. We propose an Improved (t, n)-threshold scheme that the size of each stego image is reduced to 3/t times of the secret image and the visual quality of stego image remains high. Moreover, the authentication property is enhanced based on Chinese Remainder Theorem (CRT). Eventually, the experimental results reveal that proposed scheme is obviously better than the other schemes.