A robust information hiding scheme for tampered cover images

摘要

In this paper, we propose a robust information hiding scheme such that the secret information is restorable upon cover image tampering. The secret information is first translated into a binary image, and then the binary image is encoded into an 'index table' via Vector Quantisation (VQ). Without noticeable damage to image quality, the secret information codes (VQ index table of secret information) are hidden repeatedly into the cover image. Using our proposed scheme, the extracted secret codes can be almost completely restored to their original state even when the cover image has been tampered with. Experimental results show that our proposed scheme restores the secret information perfectly under many types of tampering attacks.