发明授权
US08049930B2 Method of halftone watermarking for hiding multi-tone watermark or two-tone watermark
有权
用于隐藏多音调水印或双音频水印的半色调水印方法
- 专利标题： Method of halftone watermarking for hiding multi-tone watermark or two-tone watermark
- 专利标题（中）： 用于隐藏多音调水印或双音频水印的半色调水印方法
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申请号： US12283902申请日： 2008-09-15
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公开(公告)号： US08049930B2公开(公告)日： 2011-11-01
- 发明人: Jing-Ming Guo , Yun-Fu Liu
- 申请人： Jing-Ming Guo , Yun-Fu Liu
- 申请人地址： TW Taipei
- 专利权人： National Taiwan University of Science and Technology
- 当前专利权人： National Taiwan University of Science and Technology
- 当前专利权人地址： TW Taipei
- 代理机构： J.C. Patents
- 主分类号： G06K15/00
- IPC分类号： G06K15/00
摘要：
A method is performed to hide a watermark in two halftone images or in a single halftone image. The halftone image contains information of the hidden watermark, and each pixel value of the halftone image is associated with a corresponding offset value. The offset value is determined according to a corresponding pixel value of the watermark and a corresponding pixel value of another halftone image. The offset value is used to compensate a corresponding input value and a corresponding original error value of the halftone image.