96 An Intelligent Watermarking Method Based on Particle Swarm Optimization and Wavelet Domain

An intelligent watermarking method based on particle swarm optimization (PSO) and wavelet domain will be mentioned in this paper. The PSO will be applied into the optimization of scaling factor, whose fitness function consists of the PSNR of the watermarked image and the NC of extracted watermark image after being attacked by some certain attacks. The experimental results prove that scaling factor optimized by PSO balances transparency and robustness very well.