ABSTRACT
This chapter aims to develop an optimized and blind invisible robust watermarking scheme based on block redundant wavelet transform (RDWT) and particle swarm optimization (PSO) to overcome some limitations of the existing techniques. The usage of the RDWT provides better imperceptibility and payload capacity to watermarking compared to existing simple wavelet transform-based schemes. The performance of any invisible watermarking scheme mostly depends on the value of the gain factor. The chapter presents a case study that combines a popular optimization algorithm and PSO with a RDWT-based watermarking scheme to obtain optimized gain factors. The proposed scheme is based on block RDWT and PSO, in which the monochrome watermark image is inserted directly into detail wavelet subbands like vertical subband, horizontal subband, and diagonal subbands of the host image. Watermarking techniques are mainly used for copyright protection or the authentication of multimedia data, such as images, video, and audio.
