A multipurpose digital watermarking algorithm of color image

Color images play an important role in the life, and watermarking algorithm based on Discrete Wavelet Transform (DWT) causes more concern. This paper presents a multipurpose digital watermarking algorithm based on DWT of color images which take full account of masking characters of Human Visual System (HVS) in color images. Usually, adding different watermarking in an image will influence each other. In this paper, we choose a suitable method to add watermarking so that the system can protect the copyright of digital products and the integrity of certification. Firstly, the original images will be converted from the RGB color space to the YCbCr space, which has excellent independence of every channel. Secondly, the information of the carrier image is deeply mined in every channel. Finally, the robust and fragile watermarking encrypted are embedded in the image. The experimental results show that the two kinds of watermarking have good robustness and sensitivity.