An novel embedding method for image watermark based on wavelet transform is proposed. With thismethod ,the value of each pels is modified directly ,so that a bit of watermark information is embedded in every pel-s. Be...An novel embedding method for image watermark based on wavelet transform is proposed. With thismethod ,the value of each pels is modified directly ,so that a bit of watermark information is embedded in every pel-s. Before emeded ,the original image is decomposed by wavelet transform,and then,a correlation mask for every imagepels is confirmed by the characteristic and tree structure ralation of the wavelet coefficients. At last, the modified val-ue of every pels is controlled by its corresponding mask for watermark information embedded . The experimental re-suits show that the embedded digital watermarks with this proposed method are invisible and robust enough againstthe commonly used image processing techniques.展开更多
As an effective method of ownership assertion for digital media, digital watermarking has been targeted especially in recent years. In this paper, an adaptive digital watermarking embedding approach is presented. By a...As an effective method of ownership assertion for digital media, digital watermarking has been targeted especially in recent years. In this paper, an adaptive digital watermarking embedding approach is presented. By applying fuzzy c-means clustering algorithm based on human visual system, the clustering result may carry out the adaptive selection of the strength value of watermark. Compared with other means, the embedded watermark is more imperceptible and robust. In the same time, there is more anti-attack ability for embedded watermark in frequency domain than that in spatial domain. In the end, we also present results to show that our approach is applicable in practice.展开更多
文摘An novel embedding method for image watermark based on wavelet transform is proposed. With thismethod ,the value of each pels is modified directly ,so that a bit of watermark information is embedded in every pel-s. Before emeded ,the original image is decomposed by wavelet transform,and then,a correlation mask for every imagepels is confirmed by the characteristic and tree structure ralation of the wavelet coefficients. At last, the modified val-ue of every pels is controlled by its corresponding mask for watermark information embedded . The experimental re-suits show that the embedded digital watermarks with this proposed method are invisible and robust enough againstthe commonly used image processing techniques.
文摘As an effective method of ownership assertion for digital media, digital watermarking has been targeted especially in recent years. In this paper, an adaptive digital watermarking embedding approach is presented. By applying fuzzy c-means clustering algorithm based on human visual system, the clustering result may carry out the adaptive selection of the strength value of watermark. Compared with other means, the embedded watermark is more imperceptible and robust. In the same time, there is more anti-attack ability for embedded watermark in frequency domain than that in spatial domain. In the end, we also present results to show that our approach is applicable in practice.