一种改进的半调数字图像水印方法

An improved watermarking method for halftone images

随着数字媒体的广泛普及,人们已经提出了许多种在灰度图像和彩色图像中嵌入水印的方法,但是由于半调图像的特殊性,这些方法大部分不适合直接应用于半调图像。本文在KW[1]方法的基础上提出了一种改进的半调图像水印方法。该方法利用了阈值T来控制水印的嵌入位置,在保证图像质量的前提下,嵌入尽可能多的数据。

With the proliferation of digital media, many watermarking methods have been proposed for digital gray,ale and color images. However, according to the halftone images＇ characters, most of them can not be directly used for halftone images. This paper presents a newly improved method for halftone images on the basis of KW method. This method uses a threshold T to choose the blocks of halftone image to imbed information, which imbeds data as many as possible under the guarantee of the quality of the halftone image.