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    • 47. 发明公开
    • SPATIO-TEMPORAL CHANNEL FOR IMAGES
    • RAUMZEITLICHER KANALFÜRBILDER
    • EP1366464A4
    • 2007-09-12
    • EP02723307
    • 2002-03-01
    • SARNOFF CORP
    • BRILL MICHAELISNARDI MICHAELPICA ALBERT
    • G06T1/00H04N1/387H04N7/08H04N7/081H04N7/26H04N7/46
    • G06T1/0071G06T1/0085G06T2201/0081G06T2201/0083H04N19/186H04N19/467H04N19/577H04N21/23892H04N21/8358
    • A channel is inserted into a sequence of image frames by varying one or more display characteristics of the image across a display (118) in accordance with a spatio-temporal pattern applied to successive lines of each modified frame to watermark the image. B-frames are preferably modified if the image is MPEG encoded (108). The blue color component of the video signal may be modified with watermark information (106) and its complement in counter-phase rotations of successive lines in pairs of frames. Modification occurs in relatively still regions of the image having a sufficient level of blue-lightness. A watermark detector (116) has a priori information about the watermark, and examines specific (still) regions of the image over time that may contain the watermark. For detection, the difference in pixel values is calculated in still regions between the received test frame and either a) the non-modified image frame or b) the successive frame of a pair.
    • 通过根据施加到每个经修改的帧的连续行的时空图案来改变图像的一个或多个显示特性来在图像帧的一个或多个显示特性上插入信道以对图像进行水印,从而将信道插入到图像帧序列中。 如果图像是MPEG编码的(B),则优选地修改B帧(108)。 视频信号的蓝色分量可以利用水印信息(106)及其在成对帧中的连续行的反相旋转中的补码来修改。 在具有足够蓝光亮度的图像的相对静止的区域中发生修改。 水印检测器(116)具有关于水印的先验信息,并随时间检查可能包含水印的图像的特定(静止)区域。 为了检测,在接收到的测试帧与a)未修改的图像帧或b)一对的连续帧之间的静止区域中计算像素值的差异。