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2. 发明授权

US07016078B2 Image-forming apparatus and method for evaluating gradation characteristic 失效
标题翻译：用于评估灰度特性的图像形成装置和方法
公开(公告)号：US07016078B2
公开(公告)日：2006-03-21
申请号：US09954028
申请日：2001-09-18
申请人： Madoka Shoji
发明人： Madoka Shoji
IPC分类号： G06K15/00 , H04N1/46
CPC分类号： H04N1/4072 , G06K15/02 , G06K2215/0094 , H04N1/407 , H04N1/4078
摘要： An image-forming apparatus processes image signals based on a predetermined gradation-converting curve. The predetermined gradation-converting curve includes at least one of: a first gradation in which a maximum absolute-value of a difference between a lightness gradation curve and its smoothed curve in a range of about 1/10 of its gradation number is not greater than 1; a second gradation in which a maximum absolute-value of first-order differential values of a difference curve between a lightness gradation curve and its smoothed curve in a range of about 1/10 of its gradation number is not greater than 100; and a third gradation, in which a maximum absolute-value of first-order differential values of a difference curve between a first smoothed curve in a range of about 1/100 of a gradation number and a second smoothed curve in a range of about 1/10 of a gradation number, is not greater than 100.
摘要翻译：图像形成装置基于预定的灰度转换曲线处理图像信号。预定灰度转换曲线包括以下至少一个：其亮度等级曲线与其平滑曲线之间的差的最大绝对值在其渐变数的约1/10的范围内的最大绝对值不大于 1; 其亮度等级曲线与其平滑曲线之间的差分曲线的一阶微分值的最大绝对值在其灰度数的约1/10的范围内的最大绝对值不大于100; 以及第三灰度，其中在灰度数的约1/100的范围内的第一平滑曲线与约1的范围内的第二平滑曲线之间的差分曲线的一阶微分值的最大绝对值 / 10的等级数不大于100。

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