水印容量可变数字图像可恢复水印算法研究  

Research on watermark algorithm of recoverable digital image with variable watermark capacity

作　　者：谢娜[1] 张亦姝 

机构地区：[1]陕西能源职业技术学院,陕西咸阳712000 [2]空军装备部,陕西西安710019

出　　处：《现代电子技术》2015年第17期87-88,92,共3页Modern Electronics Technique

摘　　要：考虑到水印嵌入容量及安全性,探究出水印容量可变的一种数字图像恢复水印算法,利用这种算法对图像特征加以提取,使容量恢复水印得以生成。图像块恢复水印以图像块中随机嵌入密钥低有效位为基础,通过对比恢复水印重构特征与图像块特征,对图像块本身真实性予以判定。变容量恢复水印应该用比特数存储图像块信息,嵌入期间还用于恢复与篡改检测,既有利于减低水印嵌入容量,又有利于算法抵抗恒均值攻击功能的提升,结果表明,数字图像恢复水印算法能够得到质量较高的恢复图像与含水印图像,具有较高拼贴攻击抵抗力。A watermark algorithm of recoverable digital image with variable watermark capacity is studied according to the embedded capacity of the watermark and the security,which can extract image features to generate the recoverable capacity watermark. The recoverable watermark of image block takes LSBs of the random embedded secret key in the image block as the foundation,the authenticity of the block itself is judged by comparing the characteristics of recovery watermark reconstruction and the image block. The number of bits should be adopted by variable capacity recovery watermark to restore the image block information,which is used for recover and tamper detection during the embedded period. It is helpful to reduce the embedded watermark capacity,and enhance the ability to resist the constant mean attacks. The analysis results show that the watermark algorithm of digital image recovery can obtain the higher quality recovery image and embedded watermark image,and has higher resistance to collage attack.

关 键 词：水印容量 可变数字图像 水印恢复 检测篡改 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]