发明授权
US06757405B1 Digital watermark embedding device, digital watermark detection device and recording medium recording computer readable program for realizing functions of two devices
失效
数字水印嵌入装置，数字水印检测装置和用于实现两个装置的功能的记录介质记录计算机可读程序
- 专利标题： Digital watermark embedding device, digital watermark detection device and recording medium recording computer readable program for realizing functions of two devices
- 专利标题（中）： 数字水印嵌入装置，数字水印检测装置和用于实现两个装置的功能的记录介质记录计算机可读程序
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申请号： US09450337申请日： 1999-11-29
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公开(公告)号： US06757405B1公开(公告)日： 2004-06-29
- 发明人: Hirofumi Muratani , Taku Katoh , Naoki Endo
- 申请人： Hirofumi Muratani , Taku Katoh , Naoki Endo
- 优先权： JP10-340019 19981130
- 主分类号： G06K900
- IPC分类号： G06K900
摘要：
A digital watermark embedding device has an input section which inputs pixel value data of an image which is a target for embedding of watermark information, an embedded position selection section which determines a position in frequency domain into which the watermark information is to be embedded, irrespectively of a frequency component value, a frequency component value variation decision section which determines a variation of a frequency component value at each embedded position determined by the embedded position selection section, a pixel value variation calculation section which calculates a variation of a pixel value at each point in pixel value domain of the image based on the embedded position in frequency domain determined by the embedded position selection section and on the variation of a frequency component value determined by the frequency component value variation decision section, a pixel value conversion section which embeds watermark information by changing corresponding pixel value data of the image in accordance with the variation of a pixel value at each point in pixel value domain calculated by the pixel value variation calculation section, and an output section which outputs pixel value data of the image into which watermark information has been embedded.
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