Realization of Embedding and Extracting Watermark Based on Wavelet Transform

In this paper,a method of realization of embedding and extracting watermark based on wavelet transform is given.An approach image and several high frequency image are gained by multi-level 2D wavelet transform to digital image.Watermark is added to the low band of the wavelet transform of image,and a watermark embedded image is reconstructed.Then,watermark is extracted from the low band of wavelet transform of watermark embedded image.