- 专利标题： Method and apparatus for recording and reproducing electronic watermark information, and recording medium
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申请号： US09984029申请日： 2001-10-26
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公开(公告)号： US06519351B2公开(公告)日： 2003-02-11
- 发明人: Hiroyuki Kimura , Takao Arai , Toshifumi Takeuchi , Hiroshi Yoshiura
- 申请人： Hiroyuki Kimura , Takao Arai , Toshifumi Takeuchi , Hiroshi Yoshiura
- 优先权： JP9-238029 19970903
- 主分类号： G06K900
- IPC分类号： G06K900
摘要：
When a video signal having electronic watermark information embedded therein is recorded on a recording medium, a reference signal is inserted in the video signal at a position different from a position of embedment of the electronic watermark information. The electronic watermark information is embedded in the video signal by alteration of a luminous value of a luminance signal included in the video signal. When the video signal is reproduced from the recording medium, a luminous value of the electronic watermark information is modified based on the reference signal.