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    • 1. 发明申请
    • METHOD OF DETECTING WATERMARKS
    • 检测水印的方法
    • WO2004090811A3
    • 2005-01-20
    • PCT/IB2004050385
    • 2004-04-02
    • KONINKL PHILIPS ELECTRONICS NVVAN VUGT HENRICUS A GVAN GESTEL HENRICUS A W
    • VAN VUGT HENRICUS A GVAN GESTEL HENRICUS A W
    • G06T1/00G06T9/00G06T9/20
    • G06T1/005G06T2201/0051G06T2201/0065
    • It is difficult to detect a watermark (40) in a video image sequence (20) if the image has been subjected (possibly by a hacker) to affine transforms such as scaling, rotation, flipping, etc. The transform carried out is generally unknown. Therefore, one or more inverse transforms (60) are performed to the image prior to detection (90) until a reliable decision can be made. The inverse transforms are performed with small stepsize variations of adequate parameters. In a preferred embodiment, an initial search for correlation is done between the inverse transformed image an a blurred version of the reference watermark, the blurred reference watermark being obtained by combining a number of e.g. rotated versions of the reference watermark. If some correlation has been found, the amount of blur and/or the stepsize is decreased. This requires fewer steps to detect the watermark.
    • 如果图像(可能由黑客)(例如可能由黑客)进行缩放,旋转,翻转等变换,则难以检测视频图像序列(20)中的水印(40)。所进行的变换通常是未知的 。 因此,在检测(90)之前对图像执行一个或多个逆变换(60),直到可以做出可靠的决定。 逆变换用适当参数的小步长变化进行。 在优选实施例中,在逆变换图像与参考水印的模糊版本之间进行相关的初始搜索,所述模糊参考水印通过组合多个例如, 旋转版本的参考水印。 如果发现了一些相关性,则模糊量和/或步幅减小。 这需要更少的步骤来检测水印。