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一种稳健性好的图象盲水印算法

DOI: 10.11834/jig.200305184

Keywords: 数据安全与计算机安全(520?1060),信息隐藏,盲水印系统,傅立叶变换,攻击分析

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Abstract:

为了可靠地对白色像素较多的灰度图象进行保护,提出了一种稳健性好的数字图象盲水印算法,该算法尤其对白色像素较多的灰度图象稳健性较强.该算法是基于原始图象的傅立叶变换,将调制后的水印信息依次加入到某些固定位置的幅值谱上.该算法具有以下特点:(1)对不同的图象,嵌入水印的强度不同,对白色像素较多的图象嵌入水印的强度较大,这样可以使透明性和鲁棒性达到较好的统一;(2)选择频域幅值谱,使嵌入水印信息的相互位置之间保持一定距离,以便减少不同幅值之间的干扰;(3)对同一幅图象而言,嵌入水印和提取水印的参数不同,而且检测的区域大于嵌入的区域,这样就可能排除由于图象空频变换而造成的能量损失;(4)在提取水印时,通过对检测图象加入随机序列来补充由存储造成的丢失信息.实验表明,该算法不仅具有较强的鲁棒性,对裁剪、噪声、压缩、涂改、平移抵抗性较强,并且复杂度较低,实用性较强.

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