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    • 35. 发明授权
    • Image filtering in HSI color space
    • HSI色彩空间中的图像过滤
    • US06631206B1
    • 2003-10-07
    • US09533394
    • 2000-03-22
    • Taiyi ChengHyun Wook ParkYongmin Kim
    • Taiyi ChengHyun Wook ParkYongmin Kim
    • G06K900
    • G06T5/002G06T5/20G06T2207/10016G06T2207/10024G06T2207/20192
    • A method for filtering an angular signal which avoids errors in averaging and differencing operations. Components of a hue signal are separated into groups based upon the sign of a corresponding filter coefficient ai for the respective component and the range of the hue component value vi. A weighted mean is computed for each of the groups. The weighted mean of the resulting values having positive filter coefficients and the weighted mean of the resulting values having negative filter coefficients then are derived. The computed value is redefined if needed to be in modulus 2&pgr;. The weighted distance of the two values then is derived. The result is the filtered hue value for a given image data pixel. A filtered hue value is obtained in the same manner for each image pixel of a desired image object or of a given image frame.
    • 一种用于过滤角度信号的方法,其避免了平均和差分操作中的误差。 基于相应分量的相应滤波器系数ai的符号和色相分量值vi的范围,将色相信号的分量分成组。 为每个组计算加权平均值。 导出具有正滤波器系数的所得值的加权平均值和具有负滤波器系数的所得值的加权平均值。 如果需要为2pi,则计算值被重新定义。 然后导出两个值的加权距离。 结果是给定图像数据像素的滤波色调值。 对于期望的图像对象或给定图像帧的每个图像像素以相同的方式获得经滤波的色调值。