A Watermark Algorithm of Content Authentication for Network Transmission Image Correcting Errors in Terms of Pixels

This paper proposes a watermark algorithm for image content authentication. It can correct errors in terms of pixels for image which transmits via media network and be tampered by noise or others hackers. There are two characteristics: first, aiming at defects of poor safety transferring on networks and the complicated calculation which are exiting in image encryption algorithm based on chaotic sequences, a new image chaotic encryption algorithm based on sampling without replacement is put forward. Second, the application of combination mapping technique supplies a gap which is exiting in image content authentication watermark. Using the authentication, digital image can be corrected in terms of pixels, and with the minimum embedded capacity and the maximum SNR. The image is divided into blocks by 8 × 8, image content authentication and correcting errors is done on blocks. In the scheme, chaotic encryption not only ensures the safety on network transferring, but also advances correcting rate which can make sure the usage of images transferring on network, at the same time it guarantees the validity of network transmission image.

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