Adaptive circuit for Y-C separation
    1.
    发明授权
    Adaptive circuit for Y-C separation 有权
    Y-C分离自适应电路

    公开(公告)号:US07310119B1

    公开(公告)日:2007-12-18

    申请号:US10862685

    申请日:2004-06-07

    IPC分类号: H04N9/78

    CPC分类号: H04N9/78

    摘要: An adaptive circuit and method for separating luminance and chrominance components from a composite video signal by deriving three input lines from the composite video signal, determining whether any luminance similarity exists among the three input lines, and then selectively enabling a component filter based on any luminance similarity. If no luminance similarity exists among all three of the input lines, then a subtractive comb filter is enabled to maintain high vertical luminance resolution. If luminance similarity exists among all three of the input lines, then an additive comb filter is enabled. The additive comb filter performs three-line averaging when a high degree of similarity exists among all three consecutive input lines to minimize cross-chroma artifacts on lines that are similar. Chrominance similarity among the three input lines can also be determined by generating first and second chrominance values using different pairs of the three input lines, computing a difference of the first and second chrominance values, and comparing the chroma difference to a threshold value. If no luminance similarity exists between any of the three input lines or no chrominance similarity exists (i.e., there is vertical chroma transition), then a notch filter incorporated into the subtractive comb filter can be enabled.

    摘要翻译: 一种通过从复合视频信号中导出三条输入线从复合视频信号中分离亮度和色度分量的自适应电路和方法,确定在三条输入线之间是否存在任何亮度相似度,然后基于任何亮度选择性地使能分量滤波器 相似。 如果在所有三条输入线之间不存在亮度相似性,则使减法梳状滤波器能够保持高的垂直亮度分辨率。 如果在所有三条输入线之间存在亮度相似性,则启用加性梳状滤波器。 当所有三条连续的输入线之间存在高度相似度时,加法梳状滤波器进行三线平均,以使相似线上的交叉色度伪影最小化。 也可以通过使用三条输入线的不同对产生第一和第二色度值,计算第一和第二色度值的差异以及将色度差与阈值进行比较来确定三条输入线之间的色度相似度。 如果在三条输入线中的任何一条线之间不存在亮度相似性,或者不存在色度相似性(即存在垂直色度转换),则可以启用并入减法梳状滤波器的陷波滤波器。

    Luminance/chrominance video data separation circuits and methods and video systems utilizing the same
    2.
    发明授权
    Luminance/chrominance video data separation circuits and methods and video systems utilizing the same 有权
    亮度/色度视频数据分离电路和利用其的方法和视频系统

    公开(公告)号:US07538823B1

    公开(公告)日:2009-05-26

    申请号:US11234788

    申请日:2005-09-23

    IPC分类号: H04N9/78

    CPC分类号: H04N9/78

    摘要: A method of separating a chroma data component from a video data stream includes determining a phase relationship between a color burst in digital video data samples of a composite video signal and a local clock signal which processes the digital video data samples. In response to determining the phase relationship, interpolation filtering is performed on the digital video data samples corresponding to first and second display lines to generate phase aligned video data samples. Adaptive filtering is then performed utilizing the phase aligned video data samples corresponding to the first and second display lines to separate the chroma component from the digital video data samples corresponding to the first display line.

    摘要翻译: 从视频数据流中分离色度数据分量的方法包括确定复合视频信号的数字视频数据样本中的色同步信号与处理数字视频数据样本的本地时钟信号之间的相位关系。 响应于确定相位关系,对与第一和第二显示行相对应的数字视频数据样本执行内插滤波,以产生相位对准的视频数据采样。 然后利用对应于第一和第二显示行的相位对准的视频数据采样来执行自适应滤波,以将色度分量与对应于第一显示行的数字视频数据样本分离。