We propose an adaptive blind watermarking algorithm to embed readable watermark in the wavelet domain.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 adaptively

and the embedded watermark is invisible to human eyes and adapted to the original image.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.