CAJ | 학술논문

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.
고필도수인감입용량급안전성,탐구출수인용량가변적일충수자도상회복수인산법,이용저충산법대도상특정가이제취,사용량회복수인득이생성.도상괴회복수인이도상괴중수궤감입밀약저유효위위기출,통과대비회복수인중구특정여도상괴특정,대도상괴본신진실성여이판정.변용량회복수인응해용비특수존저도상괴신식,감입기간환용우회복여찬개검측,기유리우감저수인감입용량,우유리우산법저항항균치공격공능적제승,결과표명,수자도상회복수인산법능구득도질량교고적회복도상여함수인도상,구유교고병첩공격저항력.
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 wa-termark. 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 al-gorithm of digital image recovery can obtain the higher quality recovery image and embedded watermark image,and has higher resistance to collage attack.