基于图像叠加与区域增强的可见水印算法

Visible Watermarking Algorithm Based on Image Overlay and Region Enhancement

针对可见水印存在的水印强度不够、视觉效果不佳问题,提出一种基于图像叠加与区域增强的可见水印生成算法,首先根据宿主图像生成同尺寸的空白蒙版,接着在空白蒙版上嵌入水印并对嵌入水印进行增强,最后将增强的水印蒙版与宿主图像进行叠加生成最终图像。实验使用4张标准数字图像进行可见水印生成以及相关攻击实验,结果表明,本文提出的算法的平均峰值信噪比在排除透明度的干扰下可达35.61,同时针对噪声、压缩等攻击时,宿主图像的失真率变化波动较小,具有较好的鲁棒性。

Aiming at the problems of insufficient watermark strength and poor visual effect of visible watermark,this paper proposes a visible watermark generation algorithm based on image superimposition and region enhancement.Firstly,a blank mask of the same size is generated according to the host image,then the embedded watermark is embedded in the blank mask and enhanced,and finally the enhanced watermark mask is superimposed with the host image to generate the final image.Four standard digital images are used for visible watermark generation and related attack experiments.The results show that the average peak signal-to-noise ratio of the proposed algorithm can reach 35.61 without the interference of transparency.Meanwhile,the distortion rate of the host image fluctuates little when it is attacked by noise and compression,and it has good robustness.