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    • 62. 发明申请
    • DIRECTIONAL DERINGING FILTERS
    • 方向除尘过滤器
    • US20170013260A1
    • 2017-01-12
    • US15200549
    • 2016-07-01
    • Jean-Marc ValinTimothy B. Terriberry
    • Jean-Marc ValinTimothy B. Terriberry
    • H04N19/117H04N19/182H04N19/43H04N19/13H04N19/61H04N19/159H04N19/176H04N19/124
    • H04N19/117H04N19/124H04N19/136H04N19/176H04N19/86
    • Systems and methods are described for removing ringing artifacts from a coded image. For each block of coded image data, a direction is identified by selecting a directional block divided into a plurality of pixel lines in one predetermined direction of a set of at least four predetermined directions. The directional block may have a constant value across each pixel line. A parameter related to a sum of a mean-square difference between a pixel value and the pixel average of pixels falling on a pixel line in the directional block that includes the location of the pixel may be calculated for each direction of the set. The direction of the set having a minimum summed mean-square difference is selected as the direction for the block based on the calculated parameter values. A non-linear filter is then applied to each block based on the identified direction for the block.
    • 描述了用于从编码图像中去除振铃伪影的系统和方法。 对于编码图像数据的每个块,通过选择在一组至少四个预定方向的一个预定方向上分成多个像素线的方向块来识别方向。 方向块可以在每个像素线上具有恒定值。 可以针对集合的每个方向计算与像素值和在包括像素的位置的方向块中的像素行上的像素行的像素平均值之间的均方差的和相关的参数。 基于所计算的参数值,选择具有最小求和均方差的集合的方向作为块的方向。 然后,基于所识别的块的方向将非线性滤波器应用于每个块。