一种基于像素交换的半色调图像水印算法

Halftone Image Watermarking Algorithm Based on Pixel Swapping

在彩色图像中隐藏信息是一种防伪措施,它能够在一定程度上准确鉴别印刷品的真伪,并不易被复制或仿制。提出了一种半色调图像水印算法,该算法将彩色图像先进行分通道处理,利用误差扩散算法将单通道图像二值化后,通过像素交换方法将水印图像嵌入到半色调图像中。实验结果证明,本算法能有效地嵌入到半色调图像中,而且提取的水印信息清晰,在受到旋转、裁剪等攻击后仍然能有效提取,可用于包装印刷品的安全。

Hiding information in a color image is an effective method for the purpose of anti-counterfeiting,it can accurately identify authenticity in a certain range,and it is not easy to be copied and replicated.A halftone image watermarking algorithm is proposed,firstly the color image is treated as R,G,B channel images,by using error diffusion algorithm the single channel image is turned into a halftone image,finally the watermark image is embed in the halftone image by the method of pixel swapping.Experimental results show that large amount of information can be embedded and extraction of the watermark information is clear,under conditions of rotating,clipping,etc,the watermark information still can be effectively extracted.This scheme can be used in packaging printing security.