一种基于DCT和NCG的数字视频水印算法

随着计算机和网络技术的快速发展,数字水印技术正成为一种数字媒体知识产权保护的有效手段.提出一种基于DCT和NCG的数字视频水印算法.它根据NCG,对视频帧进行分类,选择具有复杂纹理特性的帧,进行分块DCT,然后比较DCT后的一对中频系数而嵌入水印.仿真实验表明,该算法具有较好的透明性,能实现水印盲检测,可抵抗常见的视频处理及攻击,如压缩、滤波、添加噪声、裁剪等.

A Digital Video Watermarking Algorithm Based on DCT and NCG

With the fast development of computer and network Techniques digital Watermarking is becoming an efficiet Method for protecting the intelletual property rights of digitol produts. This paper proposes a novel digital video watermark algorithm based on DCT and NCG. By utilizing the NCG, the video frames in a video sequence are classified, and those frames with complex textures are chosen to perform block - based DCT. Watermark information is embedded by comparing the middle frequency coefficients of DCT. The experimental results demonstrate that the proposed approach is transparent, and can blindly detect the watermark, and it can resist most common video processing and attacks such as compression, filtering, adding noises and cropping. With the fast development of compute and network techniques, digital water marking is becoming an efficiect method for protecting the intellectual property rights of digital products.