基于Hilbert曲线和位置自调节法的图像版权保护算法

以小波的相关理论为基础,先把水印图像预置乱处理,对宿主图像直接进行小波包分解,之后将水印的低频部分和中高频部分分别采用Hilbert曲线扫描和位置自调节法嵌入到宿主图像中,嵌入强度可根据图像的内容自适应调节。通过实验观察,新算法在抗压缩和抗剪切性能有所提升,同时隐蔽性和抗噪能力也得到了较大改观,结果充分说明该算法是一种性能较为优良的图像版权保护算法。

An Image Copyright Protection Algorithm Based on Hilbert Curve and Position Automatic Adjustment Method

Based on the theory of wavelet transform,firstly,the watermark image is scrambled and the host image is decomposed directly with wavelet packet.Then,low frequency part and high frequency part of the watermark are embedded into the host image by Hilbert scanning and position automatic adjustment methods.The embedding strength can be adjusted adaptively,according to the content of the image.Through experimental observation,anti-compression and anti-shear performances of the new algorithm are improved in addition to maintaining other performance,meanwhile,concealment and anti-noise ability also have been improved greatly.The result shows that the algorithm is a kind of good watermarking algorithm for image copyright protection.