CAJ | 학술논문

以分形编码技术及伪Zernike矩相关知识为基础,提出一种可有效抵抗几何攻击的高鲁棒数字水印新算法.算法首先利用分形编码及设置的阈值将图像分成自相似性块和非自相似性块;然后计算自相似性块的伪Zernike矩,并从中选出最鲁棒的矩;最后通过量化调制伪Zernike矩幅值将水印嵌入其中.仿真实验表明,算法不仅具有较好的透明性,而且对常规信号处理(滤波、锐化、加噪和JPEG压缩等)和几何攻击(全局仿射变换、局部失真等)均具有较好的鲁棒性.
이분형편마기술급위Zernike구상관지식위기출,제출일충가유효저항궤하공격적고로봉수자수인신산법.산법수선이용분형편마급설치적역치장도상분성자상사성괴화비자상사성괴;연후계산자상사성괴적위Zernike구,병종중선출최로봉적구;최후통과양화조제위Zernike구폭치장수인감입기중.방진실험표명,산법불부구유교호적투명성,이차대상규신호처리(려파、예화、가조화JPEG압축등)화궤하공격(전국방사변환、국부실진등)균구유교호적로봉성.
A new image watermarking scheme robust to geometric attacks was proposed based on fractai coding and pseudo-Zernike moments. Firstly, the original image was divided into two groups: self-similarity blocks and non-self-similarity blocks by fractal coding and pre-set threshold. Then, the most robust pseudo-Zemike moment was picked up among the pseudo-Zernike moments of the self-similarity blocks. Finally, the watermark was embedded by quantizing the magnitudes of the most robust pseudo-Zernike moment. The experimental results show that the scheme is not only invisible and robust against common signals processing such as median filtering, sharpening, noise adding, JPEG compression, etc, but also robust against the geometric attacks such as atone transform, local geometric distortion, etc.