A digital watermark using clustering and multiresolution analysis of image with wavelet transform

摘要

Conventional watermarking using wavelet transform may be very weak against alteration attack of malicious users because of inaccurate detection of the embedded position. Therefore, we propose a new algorithm to detect the embedded position precisely. Our method is capable to detect the embedded watermark accurately by means of clustering the substantial characteristic of multi resolutional representation with the wavelet transform after applying the appropriate filter and getting their variance.