Digital Watermarking Based on Wavelet Transform and Cultural Invasive Weed Algorithm

The robustness and the imperceptibility are important properties in a digital watermarking system. Since they conflict with each other, a traditional watermarking system is difficult to satisfy them at the same time. In order to solve the above-mentioned problem, a novel digital watermarking method based on cultural invasive weed algorithm (CIWA) is designed to resolve the difficulties of the robustness and imperceptibility at the same time. The proposed CIWA combines the advantages of cultural algorithm (CA) and invasive weed optimization algorithm (IWO), so the proposed CIWA has the capability to search for the global optimal solution. The robustness and the imperceptibility of the watermarking system were optimized comprehensively by CIWA searching optimal parameters of embedding strength and embedding threshold. Simulation results have proved that the proposed method is superior to other methods based on intelligent algorithms.