中文说明：一个用DCT的数字水印毕业论文。本文重点研究了基于DCT的低频水印算法、基于DCT的中频水印算法和基于DCT的自适应视频水印方案。
English Description：
A digital watermarking thesis with DCT. This paper focuses on low frequency watermarking algorithm based on DCT, medium frequency watermarking algorithm based on DCT and adaptive video watermarking scheme based on DCT.