空域数字图像水印算法研究与实现

数字水印技术是近年来出现的用于版权保护、身份认证、篡改提示的一种有效工具。其实质是一个隐藏在数字化图像、视频和音频等多媒体中的信息。提出了一种空域数字图像水印算法,首先通过密钥选择载体图像的嵌入位置,结合二值水印的值及载体图像象素值的奇偶性,对象素做轻微修改,从而达到水印嵌入的目的。最后给出实验结果,分别模拟剪切、维纳滤波、不规则色块污染、中值滤波等攻击下提取的水印,较好地证明了算法的鲁棒性和不可见性。

Study and Realization for Digital Image Watermarking Algorithm Based on Spatial Domain

Digital watermarking has emerged as a potentially effective tool for copyright protection,authentication and tamper proofing.Watermarking is essential information hiding in digital image,video and audio frequency.This paper has given a spatial domain digital watermarking algorithm.Firstly,the embedded positions have been fixed by secret key,pixels of which will be modified slightly associate with binary watermarking and parity of original image.Experimental results have demonstrated that the watermarking is invisible and robust against attack of cutting,wiener filter,interrupted color stain and median filter.