中文摘要：

文章在多层变换（即图像分层分块DCT变换）的基础上，每层加入了一种置乱后的水印，每个置乱水印由不同的离散沃尔什-哈达玛变换产生。一方面具备了多层嵌入的隐蔽性和鲁棒性，另一方面水印本身置乱后即使提取也不易被还原，从而构成了数字水印的双重保险，加大了水印的保密性和鲁棒性。

英文摘要：

Based on the image multilayer transform(or the layered-block DCT transform of the image), the paper expounds that each scrambling watermark generated from different discrete Walsh-Hadamard transforms is embedded inside each layer of the image. On the one hand, it has the concealment and robustness property of the multilayer embedding. On the other hand, the watermarking itself is not easy to restore when it has been scrambled, even if it is extracted. It constitutes double insurance of digital watermarking, then increases the advantages of confidentiality and robustness .