常见水印攻击对灰度图像多个位平面噪声研究

Research on Noise of More Bit Planes of Gray Images for Common Watermark Attack

针对水印攻击对图像不同位平面有不同影响的问题,用Stirmark工具对灰度图像的任意一个、两个、三个以及四个位平面攻击,分析每种攻击对位平面组合产生的噪声分布规律。结果表明,对不同图像的任意1个位平面实施15种不同攻击,其中13种攻击都有从第2位平面到第6位平面的鲁棒性依次减弱的规律;对不同图像的任意二个位平面攻击,大多数攻击均有相邻位平面或间隔最大的位平面抗攻击性较强的规律;对不同图像的任意三个位平面攻击,大多数攻击均呈现相邻的3个位平面图像抗攻击能力较强或与2个位平面抗攻击能力成正比的性能;对不同图像的任意四个位平面攻击,大多数攻击均表现出较强的抗攻击性能。为设计基于空域的强鲁棒水印算法提供重要依据。

A statistic analysis strategy for noise distribution of more bit planes of gray images attacked by Stirmark is presented to aim at the problem of the different effect on the different more bit planes of images from watermark attack. When the different attacks act on dif ferent bit planes of different images, experimental results show that there are the same features for all the tested images acted by most of attacks, which the robustness is lower and lower along with the increasing bit planes that they are between the second bit plane and the sixth bit plane for a bit plane. There are the similar features for all the tested images acted by most of attacks, which the robustness is stronger in adjacent bit planes and in largest-interval bit planes than other bit planes for random two bit planes. There are the similar fea tures for random three bit planes and four bit plants. The features provide the important support for the design of the strong robustness watermark algorithm based on spatial area.