A blind watermarking algorithm based on DWT for color image

Abstract

The work concerns with the watermarking algorithm that embeds binary image data invisibly into a color image based on discrete wavelet transform (DWT). The original color image is transformed into the YUV color space. Exploiting the excellent properties of the wavelet transform, we use the mean and variance of the detail subbands to modify the wavelet coefficients adaptively to embed the watermark. This is a blind watermark algorithm to confirm the copyright without the original image and the watermark is a meaningful binary image. The experimental results show that the watermarks are invisible and robust against noise and commonly image-processing methods, such as JPEG/JPEG2000 lossy compression, Gaussian noise, salt-pepper noise, cropping, pixel-shift, and so on.