A multi-channel watermarking scheme based on HVS and DCT-DWT

Abstract

With the rapid growth of the Internet and multimedia processing techniques, digital data becomes much easier to obtain which brings the problem of copyright protection. Among various ways, digital watermarking has been proven to be an effective solution to the problem of copyright infringement. This paper proposes a new blind watermarking algorithm for digital images based on DCT and DWT. First, the original image is transformed from the RGB color spaces into the YCbCr color spaces in which the watermark is embedded into all the three color spaces. Second, the position in which watermark was embedded was chosen by Human Visual System (HVS), and the watermarking embedding is achieved by the proposed algorithm based on DCT and DWT. Experimental result indicates that the algorithm is visually imperceptible and robust to general image processing.