Techniques to Provide Robust and High Capacity Data Hiding of ID Badges for Increased Security Requirements

In this paper we propose a new high capacity, low energy requirement, and robust spread spectrum watermark approach for still images. This approach uses an orthogonalisation scheme to generate a set of binary spread spectrum carriers that are able to minimize the interference of the original image on the watermark information detection, so that, more than two hundred bit capacity in a one squared inch photo image is achieved. A state-of-art LDPC code with near maximum likelihood decoding is used. A perception feedback is applied during the watermark embedding that adjusts the watermark energy so that it is just significant enough to be correctly detected, without disturbing the image fidelity.