Image encoding and watermarking in the double random phase encoding scheme with sparse representation strategy

摘要

A novel method for image encoding and watermarking is proposed in this paper. It is shown that the security of the double random phase encoding (DRPE) scheme could be improved by watermarking the encoded image with a simple approach, which derives from the sparse representation strategy. The watermarked ciphertext is demonstrated to be stationary white noise, as a result of which the watermark hidden in the watermarked ciphertext is hard to be perceived. In addition, the watermark is also robust against noise and occlusion attacks. Both mathematical analysis and simulations are presented to illustrate the system performance.