【摘要】 图象小波变换后获得的低频尺度子图携带了较多的信号能量,在这一分量上嵌入水印,可保证水印稳健性较好,也能提高图象对水印的容量。作者应用小波提升算法基础上获得的非线性小波变换方法来提高尺度子图系数的值,增强这些系数的感觉容量,实验结果表明使用这种方法可以获得稳健性更强的小波水印嵌入算法。更多还原

【Abstract】 In this paper, we study a new strategy to embed watermarks to the scale subband of image wavelet transform domain.It has higher perceptual capacity than coefficients in other subband to embed watermarks. We also use nonlinear wavelet transform derived from lifting scheme to get bigger scale subband coefficients. The experimental result shows that the image watermarking algorithm using nonlinear wavelet transform is more robust than algorithms using usual wavelet transform.更多还原