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    • 6. 发明授权
    • Luminance correction apparatus for image signals
    • 图像信号亮度校正装置
    • US5671013A
    • 1997-09-23
    • US967840
    • 1992-10-28
    • Toshio Nakao
    • Toshio Nakao
    • H04N5/20G06T1/00G06T5/00H04N5/235H04N5/243H04N9/68H04N5/222H04N5/228H04N5/238
    • H04N5/235
    • An apparatus for correcting a luminance level of a still picture obtains first and second images of the same object to produce two sets of pixels of image information. A boundary luminance level is set between the maximum and minimum luminance levels of the first image. A correspondent luminance level is determined as the luminance level of the pixels of the second image which correspond to those pixels of the first image having a luminance level equal to the boundary luminance level. A substitution correction value is determined for each pixel of the second image which corresponds with a pixel of the first image having a luminance level above or below the boundary luminance level. Each substitution correction value is a function of the boundary luminance level and the correspondent luminance level. Each pixel of the first image which has a luminance level above or below the boundary luminance level is replaced with the corresponding pixel of the second image corrected by the respective substitution correction value, the replaced pixel being within a luminance range extending from the minimum to the maximum luminance level of the first image.
    • 用于校正静止图像的亮度水平的装置获得相同对象的第一和第二图像以产生两组图像信息的像素。 在第一图像的最大和最小亮度级之间设置边界亮度水平。 相应的亮度级被确定为与具有等于边界亮度级别的亮度级别的第一图像的那些像素对应的第二图像的像素的亮度级。 对于与具有高于或低于边界亮度水平的亮度水平的第一图像的像素对应的第二图像的每个像素,确定替换校正值。 每个替代校正值是边界亮度级和对应亮度级的函数。 具有高于或低于边界亮度水平的亮度水平的第一图像的每个像素被替换为由相应的取代校正值校正的第二图像的对应像素,替换的像素在从最小到最小的亮度范围内 第一图像的最大亮度水平。