发明公开
EP2009918A1 Method for selecting image pixels to watermark and watermarking method using this selection
审中-公开
威尔法罕Zur Wahl von BildpixelnfürWasserzeichen und Wasserzeichenverfahren damit
- 专利标题： Method for selecting image pixels to watermark and watermarking method using this selection
- 专利标题（中）： 威尔法罕Zur Wahl von BildpixelnfürWasserzeichen und Wasserzeichenverfahren damit
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申请号： EP08158107.6申请日： 2008-06-12
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公开(公告)号： EP2009918A1公开(公告)日： 2008-12-31
- 发明人: Vigouroux, Jean-Ronan , Bourdon, Pascal , Doyen, Didier
- 申请人： THOMSON Licensing
- 申请人地址： 46, Quai Alphonse Le Gallo 92100 Boulogne-Billancourt FR
- 专利权人： THOMSON Licensing
- 当前专利权人： THOMSON Licensing
- 当前专利权人地址： 46, Quai Alphonse Le Gallo 92100 Boulogne-Billancourt FR
- 代理机构： Browaeys, Jean-Philippe
- 优先权： FR0756188 20070629
- 主分类号： H04N5/913
- IPC分类号： H04N5/913
摘要：
This invention relates to a method to select, in an input image, pixels that can be watermarked by replacing their colour by a metameric colour. It comprises the following steps:
- correct (10) the input image by applying a predetermined gamma law,
- convert (11) the input image into a 'metameric' image in which the colours of the input image pixels are replaced by metameric colours,
- simulate (12) the capture of the input image and of the metameric image by a camcorder in order to generate respectively a captured input image and a captured metameric image,
- determine (13), in a colour space and for each pixel of the input image, the distance between the colour of said pixel in the captured input image and in the captured metameric image, and
- select (14) the pixels of the input image for which the distance is greater than a threshold.
The invention also concerns a watermarking method based on metamerism.
- correct (10) the input image by applying a predetermined gamma law,
- convert (11) the input image into a 'metameric' image in which the colours of the input image pixels are replaced by metameric colours,
- simulate (12) the capture of the input image and of the metameric image by a camcorder in order to generate respectively a captured input image and a captured metameric image,
- determine (13), in a colour space and for each pixel of the input image, the distance between the colour of said pixel in the captured input image and in the captured metameric image, and
- select (14) the pixels of the input image for which the distance is greater than a threshold.
The invention also concerns a watermarking method based on metamerism.
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