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.

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。

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With banks ordered to stay closed until Thursday, and people struggling to get cash, Cypriot lawmakers are dithering on a deal that still needs to be ratified in parliament, while also revising the conditions in an effort to place more of the burden on the rich.

CNN: Cyprus deposit tax 'overnight robbery,' says businessman