数字水印技术是指用信号处理的方法在数字化的多媒体数据中嵌入隐蔽的标记，这种标记通常是不可见的，只有通过专用的检测器或阅读器才能提取。数字水印在信息隐藏及图象隐藏方面有着极为广泛的应用。-Digital watermarking technology is that by using the method of signal processing in the digital multimedia data embedded hidden tag, this tag is not usually visible only through a dedicated detector or reader can be extracted. Digital Watermarking and Information Hiding in the hidden image has a very wide range of applications.