基于频域DCT特性的数字图像双水印算法

Dual Watermarking Algorithm Based on DCT Domain of Digital Image

本文提出了一类基于DCT特性的鲁棒加半脆弱的双水印算法。首先根据图像的纹理特性将原始图像分块,然后,利用不同的嵌入因子将可见水印嵌入到原始图像以显示所有权,然后通过混沌序列确定不可见水印的嵌入位置,将它嵌入到高纹理区以认证图像,从而达到防篡改的目的。经验证,此双水印系统能够有效达到标识认证图像所有权的目的,有较高的鲁棒性和实效性。

A new dual watermarking algorithm that based DCT domain is presente. The original image was first segmented into blocks based on the texture property, and different embedding intensities were used to embed the watermarking into the Discrete Cosine Transform（DCT） domain of the original image to indicate ownership of the image. And then the invisible watermarking was embedded into the high frequence part to verify ownershipof the image through the chaotic sequence. The experiment shows that the prposed dual watermarking system can indicate and verify the ownership with high robust and practicality.