CAJ | 학술논문

针对目前基于图像特征的数字水印对非等比例缩放攻击鲁棒性不足的现状,提出了一种模板和图像特征相结合的水印算法.该算法首先利用模板信息纠正非等比例缩放的攻击,再用Harris-Laplacian检测算子从载体图像中提取出稳定的特征点,然后根据特征尺度自适应确定局部特征区域,并采用圆环量化的方法将水印信息嵌入到局部特征区域中.实验表明,新算法可以保证水印的不可见性,而且对常规信号处理和几何攻击尤其是非等比例缩放具有较好的鲁棒性.
침대목전기우도상특정적수자수인대비등비례축방공격로봉성불족적현상,제출료일충모판화도상특정상결합적수인산법.해산법수선이용모판신식규정비등비례축방적공격,재용Harris-Laplacian검측산자종재체도상중제취출은정적특정점,연후근거특정척도자괄응학정국부특정구역,병채용원배양화적방법장수인신식감입도국부특정구역중.실험표명,신산법가이보증수인적불가견성,이차대상규신호처리화궤하공격우기시비등비례축방구유교호적로봉성.
As to the digital watermarking based on local feature is lack of robustness to non-scaling attacks,this paper put forward a watermarking algorithm based on template and local feature. Firstly,the template information was used to correct the non-scaling attacks. Then the Harris-Laplacian detector was utilized to extract steady feature points from the host image,and the local feature regions area were determined adaptively according to the feature scale theory;finally,the digital watermarks were embedded into the local feature regions using cirque quantization. Experimental results show that the proposed scheme is not only invisible and robust against common signals processing,but also robust against the geometric attacks,in particular,the non-scaling.