一种基于随机误差分散技术的半色调水印方法

介绍了一种新颖的半色调图像水印方法,即当一幅连续色调图像使用随机误差分散方法转化为半色调图像时,利用一种特殊的技巧将一幅二值图像嵌入到半色调化的图像中,在提取水印时,将含有水印的半色调图像与原始不含有水印的半色调图像做图像差分运算,就可以直接从差分后的图像上看到嵌入的二值图像。仿真结果表明:该算法具有较好的水印不可感知性,同时当含有水印的图像遭受很强的随机涂改攻击时,仍能够提取其中嵌入的水印,对涂改操作具有很好的抵抗能力。

Watermarking algorithm for halftone images by stochastic error diffusion

A novel method to hide binary visual pattern in halftone images by stochastic error diffusion with the Jarvis kernel was proposed. When changing a continue tone image to a halftone image, a special technique to embed a binary image into the halftone image was used. To extract watermark in the halftone image, the image difference technology was applied. After the original halftone image and the halftone image with watermark were made difference, the hidden binary visual patterns will appear. Simulation results show that the proposed algorithm has good visual mode, and when the halftone image with the watermark is severely scratched, the detection algorithm can efficiently detect the watermark, which proves this proposed algorithm is robust to the scratching attack.