常见水印攻击对灰度图像多个位平面噪声研究 关键词：Stirmark；水印攻击；位平面；噪声分布；鲁棒性 [gap=1281]Key words：Stirmark；watermark attack；bit planes；noise distribution；robustness
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噪声分布规律 distribution of noise
三角形分布噪声 triangle noise
噪声幅度分布 noise amplitude distribution
噪声源分布 noise source distribution ; distribution of noise sources
环境噪声等级分布 distribution of environmental noise level
噪声非均匀分布 non-uniform noise distribution
复杂分布噪声 Complicated distributed noises
混合分布噪声 mixed distributed noise
非对称分布噪声 asymmetrical distributed noise
Then calculated the statistics, such as the gray medium, the variance and the signal noise ratio. Finally, the digital forgery could be detected through comparing the similarity of noise distribution shown by the statistics among the different regions.
首先利用基于边缘保护的滤波方法检测出图像中的噪声；然后计算图像中同质区域噪声的均值、方差和信噪比等统计量，通过比较图像中同质区域的噪声分布规律的相似性程度实现伪造图像鉴别。
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同时给出了噪声分布直方图和线性响应曲线。
The histogram of noise distribution and the curve of the response linearity are also given.
分析了时间-调频斜率分布的噪声分布特性；
The specific noise distribution in the time-frequency rate distribution (TFRD) is analyzed.
本文中定义的噪声条件包括噪声强度及噪声分布密度两个因素。
The noise conditions defined by the paper include two factors:noise strength and noise distribution density.
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