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    • 101. 发明申请
    • COMPOSITE MASKING SYSTEM AND METHOD FOR IMPROVING INVISIBILITY OF HIGH-DEFINITION VIDEO WATERMARKING
    • 用于改善高分辨率视频水印可信度的复合掩模系统和方法
    • US20120027207A1
    • 2012-02-02
    • US13180534
    • 2011-07-11
    • Heung Kyu LEETae Woo OhKyung Su KimJi Won LeeHee Dong Kim
    • Heung Kyu LEETae Woo OhKyung Su KimJi Won LeeHee Dong Kim
    • H04N7/167
    • H04N21/8358G06T1/0028G06T1/0064G06T2201/0051G06T2201/0202
    • A composite masking system and method for improving the invisibility of high-definition video watermarking. The composite masking system includes a watermark generation module, a mask generation module, and watermark embedment means. The watermark generation module generates a basic watermark pattern using a private key, and generate a watermark pattern by repeatedly extending the basic watermark pattern. The mask generation module generates a Noise Visibility Function (NVF) mask using NVF masking means, an adaptive dithering mask using adaptive dithering masking means, and a contour mask using contour masking means. The watermark embedment means generates a composite mask by multiplying the NVF mask, the adaptive dithering mask and the contour mask together, multiplying the composite mask and the extended watermark pattern together, and embedding the result of the second multiplication in the luminance channel of an original image.
    • 一种用于提高高清视频水印隐形性的复合掩蔽系统和方法。 复合掩蔽系统包括水印生成模块,掩码生成模块和水印嵌入装置。 水印生成模块使用专用密钥生成基本水印图案,并通过重复地扩展基本水印图案来生成水印图案。 掩模产生模块使用NVF掩蔽装置,使用自适应抖动掩蔽装置的自适应抖动掩模和使用轮廓掩蔽装置的轮廓掩模来生成噪声可见性功能(NVF)掩模。 水印嵌入装置通过将NVF掩模,自适应抖动掩模和轮廓掩模相乘来生成复合掩码,将合成掩码和扩展水印图案相乘,并将第二乘法的结果嵌入原始图像的亮度通道中 图片。
    • 109. 发明授权
    • Adaptive directional edge-preserving false contour filtering
    • 自适应方向边缘保留假轮廓过滤
    • US07747100B2
    • 2010-06-29
    • US11330055
    • 2006-01-12
    • Jae-Seung KimWonseok AhnRae-Hong ParkBo Ra LimJi Won Lee
    • Jae-Seung KimWonseok AhnRae-Hong ParkBo Ra LimJi Won Lee
    • G06K9/40G09G5/00
    • G06T5/002G06T5/20G06T5/50G06T7/12G06T2207/20012G06T2207/20192
    • A method for adaptive false contour reduction includes: detecting contour location information by removing a flat region having certain brightness values from a first input image based on a bright value difference between the first input image and a second input image with a bit depth of the first input image reduced; detecting false-contour direction and location information by measuring directional contrast of the flat region-removed first image, and distinguishing the false contour area and an edge area out of the false contour location information based on the measured contrast; and smoothing the false contour area by using the false contour direction and location information, and removing the false contour from the first input image. Thus, a flat region can be automatically removed by using a brightness value difference between a bit depth-reduced image and an original input image and detect a false contour, thereby enhancing a precision degree of false contour detection. Further, signal components can be prevented from being degraded by performing smoothing over only a false contour.
    • 一种用于自适应假轮廓降低的方法包括:通过基于第一输入图像和第二输入图像之间的亮度值从第一输入图像中去除具有特定亮度值的平坦区域来检测轮廓位置信息,其中第一 输入图像减少; 通过测量平坦区域去除的第一图像的方向对比度来检测假轮廓方向和位置信息,并且基于测量的对比来区分假轮廓位置信息中的假轮廓区域和边缘区域; 以及通过使用所述假轮廓方向和位置信息来平滑所述假轮廓区域,以及从所述第一输入图像中去除所述假轮廓。 因此,可以通过使用位深度缩小图像和原始输入图像之间的亮度值差来自动去除平坦区域,并检测假轮廓,从而提高伪轮廓检测的精确度。 此外,通过仅对假轮廓进行平滑化,可以防止信号分量的劣化。