摘要
提出了一种基于分块Hadamard变换的鲁棒图像水印算法。水印图像先进行置乱和扩展得到水印序列。原始图像进行8×8分块的Hadamard变换,在中频系数里按不同强度嵌入水印。水印提取时,先计算与原始图像在对应的变换域系数的差值,再计算该差值与水印编码的相关性来确定每个水印像素。实验表明,该算法对原始图像的视觉影响小,具有良好的鲁棒性。
This paper proposes a new robust watermarking algorithm based on block Hadamard Transform（HT）.The binary watermark image is displaced to destroy space relativity and then expanded to get watermark sequence.The original image is subdivided to 8×8 blocks and is executed HT transform.Then middle HT coefficients are selected to hide watermark.The correlation of watermark code and the difference of HT coefficients between embedded and original image is used to determine each bit when watermark is detected.Experiment shows that the algorithm has no appreciable influence to image appearance and it is robust to JPEG compression,clipping,filtering and noise pollution.
出处
《计算机工程与应用》
CSCD
北大核心
2010年第5期76-79,共4页
Computer Engineering and Applications
基金
浙江省自然科学基金No.Y105278~~
