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31. 发明授权

US4758885A Method of processing color image 失效
标题翻译：彩色图像处理方法
公开(公告)号：US4758885A
公开(公告)日：1988-07-19
申请号：US872511
申请日：1986-06-10
申请人： Takashi Sasaki , Yoshiro Udagawa
发明人： Takashi Sasaki , Yoshiro Udagawa
IPC分类号： H04N1/60 , H04N1/46
CPC分类号： H04N1/6058
摘要： A color image processing method and apparatus whereby a color image signal of an input system having a wide color reproducing range with respect to the brightness and saturation, such as an apparatus for producing a color television signal, is converted into a color image signal of an output system having a narrow color reproducing range, such as an ink jet color printer. With this method, a plurality of color points out of the color reproducing range of the output system are compressed and mapped to a plurality of color points in this range, respectively, with the hue held constant on the basis of a white point on the chromaticity diagram as a standard. In the compressing and mapping processes, the brightness is first compressed and the saturation is then compressed. In this manner, by compressing and mapping each point in the color unreproducible range of the output system to a point in the color reproducible range, a high quality color image can be derived.
摘要翻译：一种彩色图像处理方法和装置，其中具有相对于亮度和饱和度的宽彩色再现范围的输入系统的彩色图像信号，例如用于产生彩色电视信号的装置，被转换为彩色图像信号输出系统具有窄的颜色再现范围，例如喷墨彩色打印机。利用该方法，输出系统的颜色再现范围之外的多个颜色点被分别压缩并映射到该范围内的多个色点，其中色调基于色度上的白点保持恒定图作为标准。在压缩和映射过程中，首先压缩亮度，然后压缩饱和度。以这种方式，通过将输出系统的颜色不可再现的范围中的每个点压缩并映射到可再现颜色范围的一个点，可以导出高质量的彩色图像。

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