Shearlet变换域内容自适应图像水印算法

提出了一种Shearlet变换域嵌入强度因子能随图像内容自适应的水印算法。算法首先利用Shearlet变换对图像内容稀疏表示选择性,找出符合人眼视觉特性要求的水印嵌入位置,然后依据图像内容自适应地计算出水印嵌入强度因子,较好地解决了鲁棒性与可见性之间的矛盾。实验结果表明,该算法能够抵抗各种攻击,具有强鲁棒性。

An image adaptive watermarking algorithm in Shearlet domain

The embedded strength is adaptively changed with image contents.Firstly,due to the sparse representation of Shearlet transform for image features,positions of important vision information can be founded out,where watermarks are embedded.And then the embedding strength is adaptively determined by the original image content.The proposed algorithm solves the conflict of watermark robustness and perceptual invisibility.Experimental results the show that algorithm is robust against various attacks.