Robustness improvement of known-host-state watermarking using host statistics
Oleksiy Koval, Slava Voloshynovskiy, F. Deguillaume, Fernando Pérez‐González, Thierry Pun · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2005
In this paper we consider the problem of performance improvement of known-host-state (quantization-based) watermarking methods undergo additive white Gaussian noise (AWGN) and uniform noise attacks. We analyze the underlying assumptions used for design of Dither Modulation (DM) and Distortion Compensated Dither Modulation (DC-DM) methods and question the optimality of high rate uniform quantizer based embedding into real images from the point of view of robustness of these methods to the selected additive attacks in terms of bit error rate probability. Motivated by superior performance of uniform deadzone quantizer (UDQ) over the uniform one in lossy transform based source coding, we propos to replace the latter one by the UDQ in data-hiding set-up designed according to the statistics of the host data that are assumed to be independent identically distributed Laplacian. Based on the suggested modifications we obtained analytical expressions for bit error rate probability analysis of host-statistics-dependent quantization-based watermarking methods in AWGN and uniform noise attacking channels. Experimental results of computer simulations demonstrate significant performance enhancement of the designed modified DM and DC-DM watermarking techniques in comparison to the classically elaborated known-host-state schemes in terms of the selected performance measure.