介绍了有序抖动、误差扩散和模板法三种图像半色调方法，在此基础上，综述了现有的半色调图像水印算法，并对其中的四种方法进行了比较。
An overview of already proposed watermarking algorithms for halftone images is given, based on the introduction of three kinds of halftone methods, ordered dithering, error diffusion and pattern.
与传统的误差扩散法相比，使用这种算法输出的半色调图像更清晰，色调更连续。
Compared with standard error diffusion, the image using this algorithm has more explicit output and more continuous tones.
与传统的误差扩散法相比，使用这种算法输出的半色调图像更清晰，色调更连续。
Compared with standard error diffusion, the image using this algorithm has more explicit output and more continuous tones.
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