Wavelet Based a New Method of Digital Watermark

To survive kinds of image manipulation, embedding the watermark into only one frequency subband usually can not provide a satisfied performance. In this paper, we proposed a new algorithm to embed watermark into still gray image. We embed watermark into both the low frequency coefficients and the high frequency coefficients with different ratio. The result of our experiment shows a better robustness of the watermark both in lowpass environment and in highpass environment.