Research on Digital Watermarking Algorithm Using Wavelet Tree

In order to improve the information of original image, a quantization algorism of wavelet tree is proposed. The algorism can change the value of the root node of the wavelet tree to embed the watermarking information and combine the position information of the sub-node to correct the mistaken information. The common attacks such as median filtering, average filtering, and Gaussian noise can be resisted in the algorism. The experiment shows the algorism introduced in this paper has the strong adaptive ability, quick computation, good invisibility and robustness.