基于多重匹配的可见水印去除算法

为恢复嵌入数字的水印图像,提出一种去除可见数字水印的方法。对彩色图像二值化,与标准数字库进行KAZE特征匹配,利用K-means算法确定其矩形区域,将其透视变换成数字模板库大小,与数字库进行模板匹配,对确认为数字的区域进行自适应膨胀和模糊操作。嵌入的数字旋转角度、大小、字体可变,存在数字的区域插值效果好,人眼难以发现水印信息。实验结果表明,该算法在无法获知水印算法的前提下,能够非常高质量地恢复图像中被数字损毁的区域。

Visible watermark removal scheme based on multiple matching

To restore watermarked images embedded with numerals,a method was proposed to remove the visible numerals watermark.Watermarked images were binarized to match with standard numerals library in KAZE operator,the rectangular area was confirmed using K-means algorithm to have a perspective transformation on the area to the size of standard numeral library,and the template was matched with standard numerals library.The region identified as digital was expanded and blurred adaptively.Embedded numerals have properties of rotation angle,size,font variable,and interpolation in numeral area is accep-table that watermark can hardly be detected by human eyes.Experimental results show that the proposed algorithm can recover the numerals damaged area with high-quality without knowing the watermarking scheme.