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    • 7. 发明授权
    • Method for selecting image pixels to watermark and watermarking method using this selection
    • 使用此选择选择图像像素到水印和水印方法的方法
    • US08045755B2
    • 2011-10-25
    • US12157468
    • 2008-06-11
    • Jean-Ronan VigourouxPascal BourdonDidier Doyen
    • Jean-Ronan VigourouxPascal BourdonDidier Doyen
    • G06K9/00G09G5/02
    • H04N9/3182G06T1/0028G06T2201/0051H04N1/32309H04N1/54H04N5/913H04N2005/91335H04N2005/91392
    • 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 the input image by applying a predetermined gamma law, convert the input image into a ‘metameric’ image in which the colours of the input image pixels are replaced by metameric colours, simulate 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, 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 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.
    • 本发明涉及一种在输入图像中选择可通过用同色异色替换其颜色而被加水印的像素的方法。 它包括以下步骤:通过应用预定的伽马定律来校正输入图像,将输入图像转换成其中输入图像像素的颜色被同色异色替代的“同位体”图像,模拟输入图像的捕获, 通过摄像机分别生成同色异体图像,以分别产生捕获的输入图像和捕获的同色异体图像,在颜色空间和输入图像的每个像素中确定捕获的输入图像中的所述像素的颜色之间的距离 并且在捕获的同色异体图像中,并且选择距离大于阈值的输入图像的像素。 本发明还涉及基于同色异体的水印方法。