【摘要】 将含有版权信息的二值图像作为水印,利用混沌密码对其进行加密,对原始图像进行一定阶次的分数傅里叶变换。通过密钥和水印图像之间的对应关系,将水印信息嵌入到原始图像的中频系数中,分数傅里叶逆变换得到嵌入了水印的图像。仿真实验结果表明,实现的水印具有不可见性,而且对于常见的噪声、裁剪、JPEG压缩具有较好的健壮性。更多还原

【Abstract】 Designs a binary image watermarking signal and encrypts it by a chaotic sequence.The original image is fractional Fourier transformed with an order.Through the correspondence between the secret key and the original watermark image,the watermark is embedded in fractional Fourier spectral domain.The watermarked image is obtained by inversely transforming.Experimental results demonstrate that the watermark is invisible and robust against crop,common noise and JPEG compress etc.更多还原