CAJ | 학술논문

如何有效抵抗几何攻击是数字图像水印研究领域的热点问题之一，一个微弱不可觉察的几何攻击就可能使绝大多数水印算法失效。以不变矩理论为基础，提出了一种基于正交傅里叶-梅林矩的可有效抵抗几何攻击的图像水印新算法。结合傅里叶-梅林矩的几何不变特性，计算出原始图像的傅里叶-梅林矩；根据稳定矩的选取规则选取部分稳定的傅里叶-梅林矩，采用量化调制策略将水印信息嵌入到所选矩的幅值中；将傅里叶-梅林矩修改前后的重构差值图像叠加到原始载体图像中，得到含水印图像。仿真实验表明，该算法不仅具有较好的不可感知性，而且对常规信号处理和几何攻击均具有较好的鲁棒性。
여하유효저항궤하공격시수자도상수인연구영역적열점문제지일，일개미약불가각찰적궤하공격취가능사절대다수수인산법실효。이불변구이론위기출，제출료일충기우정교부리협-매림구적가유효저항궤하공격적도상수인신산법。결합부리협-매림구적궤하불변특성，계산출원시도상적부리협-매림구；근거은정구적선취규칙선취부분은정적부리협-매림구，채용양화조제책략장수인신식감입도소선구적폭치중；장부리협-매림구수개전후적중구차치도상첩가도원시재체도상중，득도함수인도상。방진실험표명，해산법불부구유교호적불가감지성，이차대상규신호처리화궤하공격균구유교호적로봉성。
One of the hottest issues in the research areas of digital image watermarking is how to effectively resist geometric distortions. An imperceptible geometric attack can even make the vast majority of the watermarking algorithms become invalid. On the basis of the theory of invariant moments and Fourier-Mellin moments, the paper proposes a new method on image watermarking, tending to resist geometric distortions more effectively. Following the principle of invariance to geometry, the characteristics of Fourier-Mellin moments, the Fourier-Mellin moments of the original image are calculated. A part of stabilized Fourier-Mellin moments are selected according to the rules of stable moments, and the watermark infor-mation is embedded into the amplitude by quantitative modulation strategy. It reconstructs the different images before and after modification, and adds them to the original carrier image, the new watermarked image will be gained. Simulation results show that the proposed method not only has the nature of better imperceptibility, but also has an excellent robust-ness to the conventional signal processing and geometric distortions.