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21. 发明授权

US4492458A Method of and arrangement for copying a colored original 失效
标题翻译：复制彩色原稿的方法和布置
公开(公告)号：US4492458A
公开(公告)日：1985-01-08
申请号：US421500
申请日：1982-09-22
申请人： Horst Bickl , Gunter Findeis , Helmut Treiber
发明人： Horst Bickl , Gunter Findeis , Helmut Treiber
IPC分类号： G03B27/73 , G03B27/80
CPC分类号： G03B27/735
摘要： A method of copying a colored original involves measuring the transparency of localized regions of the original in each of the three primary colors. Three localized transparency ratios for each region are formed from the transparency values for the different colors. Three corresponding average transparency ratios for the original as a whole are computed from the localized transparency ratios. Each average transparency ratio is compared with a statistical average of similar ratios obtained from a large number of average originals. If an average transparency ratio of the original to be copied deviates from the corresponding statistical average by more than a predetermined amount, the number of each of the localized transparency ratios lying inside and outside of a predetermined range about the corresponding average transparency ratio of the original is counted. When the number outside of a predetermined range exceeds the number inside, a color dominant is assumed to be present in the original. Otherwise, a color tinge is assumed to be present. The original is copied using a correction factor which depends upon whether a color dominant or a color tinge is present. An alternative method summing the differences between the localized transparency ratios and the respective average transparency ratios of the original is also presented.
摘要翻译：复制彩色原稿的方法包括测量原始图像在三种原色中的每一种中的局部区域的透明度。从不同颜色的透明度值形成每个区域的三个局部透明度比。根据局部透明度比率计算原始整体的三个相应的平均透明度比。将每个平均透明度比率与从大量平均原件获得的类似比率的统计平均值进行比较。如果要复制的原件的平均透明度比偏离相应的统计平均值超过预定量，则每个局部透明度比例在相对于原始图像的对应的平均透明度比的预定范围内和之外的数量算了当超过预定范围的数量超过内部数量时，假定原色中存在着色显性。否则，假定存在颜色色调。使用校正因子来复制原件，该校正因子取决于是否存在着色或颜色色调。还提出了一种将局部透明度比率和原始平均透明度比的差异相加的替代方法。

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