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31. 发明授权

US07053910B2 Reducing metamerism in color management systems 失效
公开(公告)号：US07053910B2
公开(公告)日：2006-05-30
申请号：US09916436
申请日：2001-07-30
申请人： Todd D. Newman
发明人： Todd D. Newman
IPC分类号： G09G5/02
CPC分类号： H04N1/6052 , H04N1/6088
摘要： A metamerism-reducing color transformation in which a color value in a perceptual color space is mapped to a corresponding color value in a device dependent color space. Multiple different inverse transforms are applied to the color value in the perceptual color space, one each for respective ones of multiple different viewing conditions such as different viewing illuminants or different surround, thereby resulting in plural different target color values in a viewing condition dependent space. The plural different target color values in the viewing condition dependent space are subjected to regression analysis based on a spectral model of reflectance of device colors so as to calculate to a single color coordinate in device dependent coordinates that best fits the plural different target color values in the viewing condition dependent space. The regression analysis may be a weighted regression analysis. Because the color value in the destination device dependent color space is obtained through best-fit regression analysis of plural different target color values corresponding to multiple different viewing conditions, metameric shifts in the color's appearance due to changes in viewing condition are significantly reduced as compared to transformations which obtain values accurate only for a single viewing condition.

32. 发明授权

US06919975B1 Creation of reverse look-up table 失效
标题翻译：创建反向查找表
公开(公告)号：US06919975B1
公开(公告)日：2005-07-19
申请号：US09360449
申请日：1999-07-26
申请人： John S. Haikin , Todd D. Newman
发明人： John S. Haikin , Todd D. Newman
IPC分类号： G03F3/08 , G06F15/00 , G06K15/00 , H04N1/60
CPC分类号： H04N1/6058
摘要： Creation of a reverse look-up table from a forward look-up table for a color device. Indexes to the forward look-up table span all possible color stimulus values for the color device in a device dependent color space. Outputs from the forward look-up table span a color gamut of corresponding color response values for the color device in a device independent appearance color space. The reverse look-up table maps a color response value in the device independent appearance color space to a color stimulus value in the device dependent color space. Indexes to the reverse look-up table span beyond the color gamut of color response values for the color device, and outputs from the reverse look-up table span beyond all possible color stimulus values for the color device. According to the invention, a first portion of the reverse look-up table, in which indexes fall within the color gamut, is populated by search and interpolation in the forward look-up table for color stimulus values corresponding to color response values of the indexes to the first portion of the reverse look-up table. A second portion of the reverse look-up table, in which indexes fall outside of the color gamut, is populated by extrapolation from extrapolation color stimulus values. The extrapolation color stimulus values are found by search and interpolation in the forward look-up table for color stimulus values corresponding to color response values near a boundary of the color gamut.
摘要翻译：从彩色设备的正向查找表创建反向查找表。正向查找表的索引涵盖设备依赖颜色空间中颜色设备的所有可能的颜色激励值。来自正向查找表的输出跨越设备独立外观颜色空间中的颜色设备的相应色彩响应值的色域。反向查找表将设备独立外观颜色空间中的颜色响应值映射到设备相关颜色空间中的颜色激励值。反向查找表的索引超出了彩色设备的颜色响应值的色域，反向查找表的输出超出了彩色设备的所有可能的颜色激励值。根据本发明，通过在正向查找表中的搜索和内插来填充索引落在色域内的反向查找表的第一部分，用于对应于索引的颜色响应值的颜色刺激值到反向查找表的第一部分。反向查找表的第二部分，其中索引落在色域之外，通过从外推颜色刺激值的外推来填充。在前向查找表中通过搜索和内插找到外推颜色刺激值，以获得与色域边界附近的颜色响应值对应的颜色刺激值。

33. 发明授权

US06603483B1 Color management and proofing architecture 有权
标题翻译：色彩管理和打样架构
公开(公告)号：US06603483B1
公开(公告)日：2003-08-05
申请号：US09440463
申请日：1999-11-15
申请人： Todd D. Newman
发明人： Todd D. Newman
IPC分类号： G09G502
CPC分类号： H04N1/6058
摘要： The generation of a color transformation sequence comprised of transform steps, wherein the color transformation sequence is for transforming color image data. At least one reference to a color profile or a gamut mapping algorithm is received, and at least one transform step is generated based on the at least one reference, wherein the at least one transform step is a profile step or a gamut-mapping step. The at least one transform step is included in the color transformation sequence.
摘要翻译：由变换步骤组成的颜色变换序列的生成，其中色彩转换序列用于变换彩色图像数据。接收至少一个对颜色简档或色域映射算法的引用，并且基于至少一个参考生成至少一个变换步骤，其中所述至少一个变换步骤是简档步骤或色域映射步骤。至少一个变换步骤被包括在颜色变换序列中。

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