A BLIND DCT WATERMARKING ALGORITHM BASED ON PARTICLE SWARM OPTIMIZATION
Changxin Liu · Journal of Jinggangshan University · 2011
A blind DCT watermarking algorithm based on particle swarm optimization is proposed in this paper.The algorithm uses particle swarm optimization to find the optimal location in image DCT transform domain.The linear combination of the PSNR and the NC values is defined as fitness function by considering the invisibility and robustness which are basic requirements of digital watermarking.The watermark is embedded into the image block's DCT-AC coefficients according to the optimal location.Experimental results indicate that the proposed scheme can assure good imperceptibility for watermarking image and is robust to additive noise,compressing,filtering and most attacks.