基于DCT变换域的抗普通剪切攻击的图像数字水印

Similar to the watermarking of cash, digital watermarking is defined as a efficient way to identify the copyright and be used as prove in law by embedding special information, for example, owners or publishers or buyers of digital copyright works, or date and serial numbers and so on, in digital image, audio, video and text with embedding techniques as well as to protect intellectual property rights and digital multimedia by testing and analyzing digital watermarking. Digital watermarking is the supplementation of traditional cryptography. The main point of this text is to study DCT-based image digital watermarking and focus on how to choose proper locations in DCT to embed watermarking so as to get better performance in general anti-shear attack based on the premise that meets invisibility requirements.