一种DCT中频水印嵌入与提取方法

数字水印在保护图像的所有权和软件的版权等方面得到了广泛的应用。一个实用的数字水印算法应该既能保证图像具有良好的可视性的同时,又要有很好的鲁棒性。文章针对这一特点提出了一种新颖的水印嵌入方法,即通过对比随机选定的DCT中频系数来嵌入水印。实验结果表明,该算法具有很好的视觉效果,并且对剪切、模糊、噪声、锐化和JPEG压缩等图像操作具有较好的鲁棒性。

A Novel Watermarking Method With DCT

Digital watermark is a technique used to protect the ownership of images and their associated software.A useful watermark scheme should be visually imperceptible and must be robust to resist various attacks.This paper proposes a novel watermarking technique that achieves the prescribed goals.It embes the watermark into the middle frequency bands of the DCT coefficients of the original image by comparing the selected coefficients.The proposed technique could actually survive several kinds of image processing such as image cropping,blurring,noise,sharpening and JPEG loss compression.