An adaptive block-based blind watermarking algorithm

In this paper we propose an adaptive block-based blind watermarking algorithm using DWT. By analyzing the characteristic of detail subband coefficients of the image after discrete wavelet transform, we use the mean and variance of the detail subbands to modify the wavelet coefficients adoptively 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 and attack analysis show that the proposed algorithm is effective and robust to common image processing operations and some geometric attacks, such as JPEG/JPEG2000 lossy compression, additive noise, cropping, pixel-shift, and so on.