水印技术在西藏壁画数字图像版权保护中的应用研究

The Research of Copyright Protection in Tibet Mural Digital Images Using Watermarking

将水印信息嵌入到载体图像多尺度分解后的高频和低频系数中,选取合适的嵌入强度。由于多尺度下的高频部分仍然可以看成是前一尺度的部份低频成分。因此在图像多尺度小波变换的基础上加入水印,即使在传输过程遇到量化舍弃、低通滤波等情况,也不会完全丢失高频成分,能随之保全水印信息。满足了水印系统不可见性和鲁棒性的要求。

This text makes watermark images embedded into the multi - scale decomposition of the carrier - frequency and low frequen- cy coefficients, selects the appropriate embedding strength. As the multi - scale high - frequency can be seen as part of the previous scale low - frequency components, In multi - scale image based on wavelet transform by adding a watermark, the image transmissions even in the face during the lowpass filtering, quantization give up, etc. the high frequency components will not be completely lost, the watermark can be followed to be preserved. The system can meet the requirements of its visibility and robustness.