公开(公告)号：US5625378A

公开(公告)日：1997-04-29

申请号：US68823

申请日：1993-05-28

申请人： Shijie J. Wan ,  Rodney L. Miller ,  James R. Sullivan

发明人： Shijie J. Wan ,  Rodney L. Miller ,  James R. Sullivan

IPC分类号： G06T1/00 ,  G06T5/00 ,  H04N1/46 ,  H04N1/60 ,  G09G5/02

CPC分类号： H04N1/6058 ,  H04N1/6019

摘要： A convex interpolation apparatus and method to map source color signals in a n-dimensional color space to target color signals in a m-dimensional color space includes finding a set of sample signals in the source color space whose convex hull encloses the given signal; determining the coefficients needed to express the given signal as a convex combination of the set of sample signals; and interpolating the source signal to obtain a target signal in the target color space by using the coefficients and the sample signals is the target color space that correspond to the sample signals selected in the source color space. The sample signals in both color spaces can be lattice points or non-lattice points. A method and apparatus are also provided which can not only determine if a point is enclosed by a convex hull of a set of points in a n-dimensional space, but also simultaneously derive the coefficients needed to express the given point as a convex combination of the set of points.

摘要翻译： 一种用于将n维色彩空间中的源色彩信号映射到m维色彩空间中的目标色彩信号的凸插入装置和方法包括：在其外壳中包含给定信号的源颜色空间中找到一组采样信号; 确定将所述给定信号表示为所述采样信号集合的凸组合所需的系数; 并且通过使用系数来内插源信号以获得目标色彩空间中的目标信号，并且采样信号是与在源色彩空间中选择的采样信号相对应的目标色彩空间。 两个颜色空间中的采样信号可以是格点或非格点。 还提供了一种方法和装置，其不仅可以确定一个点是否被n维空间中的一组点的凸包围住，而且还同时导出将给定点表示为凸组合所需的系数 一组点数。

公开(公告)号：US5704026A

公开(公告)日：1997-12-30

申请号：US782852

申请日：1997-01-13

申请人： Shijie J. Wan

发明人： Shijie J. Wan

IPC分类号： G09G5/06 ,  G06T1/00 ,  H04N1/46 ,  H04N1/60 ,  G06T15/50

CPC分类号： H04N1/6058

摘要： A device gamut boundary surface in a device independent color space (DICS) is defined by a set of small triangles. Each triangle in the DICS corresponds to a triangle on the surface of a color cube in a device dependent color space (DDCS). The triangles in the DICS are derived based on a look-up table which can be obtained by measuring a set of color patches produced from the given device. A small set of carefully selected gamut boundary points or signals in the DICS are determined and their corresponding signals or points on the surface of the color cube in the DDCS are computed. These data are stored in a table called a gamut descriptor. Gamut descriptor signals or points can be determined by a convex polyhedral cone inclusion process and their corresponding signals in the DDCS can be determined by triangle interpolation. The gamut descriptor usually includes gamut boundary signals at a number of lightness layers along a series of predetermined hue angles. The gamut descriptor is a compact representation of the gamut boundary. The signal distribution pattern in a gamut descriptor provides useful information for determining in-gamut and out-of-gamut signals and for fast mapping between color spaces in cross-media color calibration.

摘要翻译： 设备独立色彩空间（DICS）中的设备色域边界面由一组小三角形定义。 DICS中的每个三角形对应于设备依赖颜色空间（DDCS）中颜色多维数据集表面上的三角形。 DICS中的三角形是基于查找表得出的，该查找表可以通过测量从给定设备产生的一组色块来获得。 确定DICS中小心选择的色域边界点或信号，并计算其在DDCS中颜色立方体表面上的对应信号或点。 这些数据存储在称为色域描述符的表中。 色域描述符信号或点可以通过凸多面体锥夹入过程确定，并且它们在DDCS中的对应信号可以通过三角插值来确定。 色域描述符通常包括沿着一系列预定色调角的多个亮度层的色域边界信号。 色域描述符是色域边界的紧凑表示。 色域描述符中的信号分布模式提供了用于确定色域内和色域外信号以及跨媒体颜色校准中颜色空间之间快速映射的有用信息。