利用基于m 序列的扩频技术实现了 一种数字图像空间域的多重水印算法. 根据m 序列的伪随机特性和抗干扰性能, 使水印具有良好 的隐蔽性和稳健性.-A kind of mult iple digital image watermark embedding and detect ing alg orithm in spat ial domain w as r ealized by use of spr ead spec- tr um technology based on m se