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    Optimal color quantization for addressing multi-dimensional color calibration look-up-table
    2.
    发明授权
    Optimal color quantization for addressing multi-dimensional color calibration look-up-table 失效
    用于寻址多维颜色校准查找表的最佳颜色量化

    公开(公告)号：US5377025A

    公开(公告)日：1994-12-27

    申请号：US980860

    申请日：1992-11-24

    申请人： Kevin E. Spaulding ,  Lawrence A. Ray ,  James R. Sullivan

    发明人： Kevin E. Spaulding ,  Lawrence A. Ray ,  James R. Sullivan

    IPC分类号： H04N1/60 ,  H04N1/46

    CPC分类号： H04N1/60 ,  H04N1/6019

    摘要： This invention minimizes the color errors associated with performing conversion and/or correction of color digital image data using multi-dimensional look-up tables of a limited size. By distributing the errors across the color gamut it is possible to reduce the average color error as well as the maximum color errors associated with linear or conventional linear or nonlinear, e.g. cube-root or logarithmic, remapping schemes. The resulting advantage will be color images with greatly reduced artifacts.

    摘要翻译： 本发明使用有限尺寸的多维查找表来最小化与执行彩色数字图像数据的转换和/或校正相关联的颜色误差。 通过在色域上分布错误，可以减少与线性或常规线性或非线性相关联的平均颜色误差以及最大色差。 立方根或对数，重映射方案。 所产生的优点将是具有大大减少的伪影的彩色图像。

    Digital halftoning with correlated minimum visual modulation patterns
    3.
    发明授权
    Digital halftoning with correlated minimum visual modulation patterns 失效
    具有相关最小视觉调制模式的数字半色调

    公开(公告)号：US5214517A

    公开(公告)日：1993-05-25

    申请号：US531266

    申请日：1990-05-29

    申请人： James R. Sullivan ,  Lawrence A. Ray

    发明人： James R. Sullivan ,  Lawrence A. Ray

    IPC分类号： H04N1/405

    CPC分类号： H04N1/4051

    摘要： A digital halftone image is produced by providing a binary bit image pattern having a minimum visual noise for each density level in the image, and the binary bit patterns being correlated in a manner that reduces visual noise resulting from transitions between patterns. The patterns are addressed by pixel density and x,y location to produce a halftone image. The patterns are generated by employing a stochastic minimization technique with a constraint to insure correlation between patterns.

    摘要翻译： 通过提供对图像中的每个密度级别具有最小视觉噪声的二进制位图像图案来产生数字半色调图像，并且以减少由图案之间的转换产生的视觉噪声的方式将二进制位模式相关联。 这些图案通过像素密度和x，y位置来处理以产生半色调图像。 通过采用具有约束条件的随机最小化技术来确保模式之间的相关性来生成图案。

    Digital halftoning with minimum visual modulation patterns
    5.
    发明授权
    Digital halftoning with minimum visual modulation patterns 失效
    数字半色调与最小的视觉调制模式

    公开(公告)号：US4920501A

    公开(公告)日：1990-04-24

    申请号：US259940

    申请日：1988-10-19

    申请人： James R. Sullivan ,  Rodney L. Miller

    发明人： James R. Sullivan ,  Rodney L. Miller

    IPC分类号： H04N1/405

    CPC分类号： H04N1/4051

    摘要： A digital halftone image is produced by providing a binary bit image pattern having a minimum visual noise for each density level in an image. The patterns are produced by employing a stochastic combinatorial minimization technique and a human visual system modulation transfer function (MTF) weighting function to generate a halftone pattern for each density level of the multi-level digital image signal. A halftone image is produced by modularly addressing these patterns with each pixel value in the image.

    摘要翻译： 通过为图像中的每个密度级提供具有最小视觉噪声的二进制位图像图案来产生数字半色调图像。 通过采用随机组合最小化技术和人类视觉系统调制传递函数（MTF）加权函数来产生图案，以产生多级数字图像信号的每个密度级的半色调图案。 通过以图像中的每个像素值模块化地寻址这些图案来产生半色调图像。

    Method and apparatus for convex interpolation for color calibration
    7.
    发明授权
    Method and apparatus for convex interpolation for color calibration 失效
    用于颜色校准的凸插值的方法和装置

    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。

    Method and associated apparatus for transforming input color values in an input color space to output color values in an output color space
    8.
    发明授权
    Method and associated apparatus for transforming input color values in an input color space to output color values in an output color space 失效
    用于变换输入颜色空间中的输入颜色值以输出输出颜色空间中的颜色值的方法和相关联的装置

    公开(公告)号：US5539540A

    公开(公告)日：1996-07-23

    申请号：US305861

    申请日：1994-09-13

    申请人： Kevin E. Spaulding ,  Ron Gershon ,  James R. Sullivan ,  Richard N. Ellson

    发明人： Kevin E. Spaulding ,  Ron Gershon ,  James R. Sullivan ,  Richard N. Ellson

    IPC分类号： G03F3/08 ,  G06T1/00 ,  H04N1/46 ,  H04N1/60

    CPC分类号： H04N1/6058

    摘要： This invention provides a method for mapping an input color space to an output color space in such a way that the color reproduction characteristics of the saturated colors can be adjusted in a custom manner, while maintaining the desired tone reproduction on the neutral axis. This is accomplished by defining independently a tone transformation and a transformation for a plurality of highly saturated colors. A transformation is formed for the remaining color values having the specified transforms for the neutral and saturated colors as boundary values. In the preferred embodiment multi-dimensional look-up tables are used to implement the transform.

    摘要翻译： 本发明提供了一种用于将输入颜色空间映射到输出颜色空间的方法，使得可以以定制的方式调整饱和色的颜色再现特性，同时保持中性轴上所需的色调再现。 这通过独立地定义多个高度饱和的颜色的色调变换和变换来实现。 形成具有用于中性和饱和颜色的指定变换的剩余颜色值作为边界值的变换。 在优选实施例中，使用多维查找表来实现变换。

    Method and apparatus for constrained gamut clipping
    9.
    发明授权
    Method and apparatus for constrained gamut clipping 失效
    用于约束色域剪辑的方法和装置

    公开(公告)号：US5731818A

    公开(公告)日：1998-03-24

    申请号：US610779

    申请日：1996-03-04

    申请人： Shijie Wan ,  James R. Sullivan

    发明人： Shijie Wan ,  James R. Sullivan

    IPC分类号： H04N9/79 ,  H04N1/46 ,  H04N1/60 ,  G06T11/40

    CPC分类号： H04N1/6058

    摘要： An efficient method for gamut clipping based on user-defined constraints on lightness and hue by: a) defining a color gamut surface of an output device using a gamut descriptor; b) specifying a search range based on maximum tolerances for lightness and hue changes; and, c) for each input color data point outside the gamut, mapping the data point to the closest point in a portion of the gamut surface specified by the search range.

    摘要翻译： 基于用户对亮度和色调的限制的色域限幅的有效方法是：a）使用色域描述符定义输出设备的色域表面; b）根据亮度和色相变化的最大公差指定搜索范围; 并且c）对于色域外部的每个输入颜色数据点，将数据点映射到由搜索范围指定的色域表面的一部分中的最近点。

    Methods and apparatus for attaching compressed look-up table (LUT) representations of N to M-dimensional transforms to image data and for processing image data utilizing the attached compressed LUTs
    10.
    发明授权
    Methods and apparatus for attaching compressed look-up table (LUT) representations of N to M-dimensional transforms to image data and for processing image data utilizing the attached compressed LUTs 失效
    将N到M维的压缩查找表（LUT）表示附加到图像数据并利用附加的压缩LUT来处理图像数据的方法和装置

    公开(公告)号：US5583656A

    公开(公告)日：1996-12-10

    申请号：US999631

    申请日：1992-12-31

    申请人： Bhavan R. Gandhi ,  James R. Sullivan

    发明人： Bhavan R. Gandhi ,  James R. Sullivan

    IPC分类号： H03M7/30 ,  G06T1/20 ,  G06T5/00 ,  G06T9/00 ,  H04N1/46 ,  H04N1/60 ,  G02B23/08 ,  G02B23/00 ,  G03B21/56

    CPC分类号： G06T9/00

    摘要： Each member of a set of transform representative data structures (such as look-up tables (LUTs), each representing an N TO M-dimensional transform), is stored in compressed form in a storage device included in, or which is otherwise accessible to, an image processing device or system. Each stored transform representative data structure may then, according to one embodiment of the invention, be selectively attached to image data being processed by the image processing device or system. According to a further aspect of the invention, image data, having compressed transform representative data attached thereto, may be processed utilizing methods and apparatus operative to detach, decompress and apply the transform represented by the decompressed transform representative data, to a decompressed version of the image data. The result of the aforementioned process is for image data to be transformed according to a transform specified by information previously attached to the image data.

    摘要翻译： 一组变换代表数据结构（诸如查找表（LUT），每个代表N TO M维度变换）的每个成员以压缩形式存储在包括在其中的存储设备中，或者以其他方式可访问 ，图像处理装置或系统。 然后，根据本发明的一个实施例，每个存储的变换代表数据结构可以选择性地附加到由图像处理设备或系统正在处理的图像数据。 根据本发明的另一方面，可以利用附加到其上的压缩变换代表数据的图像数据，使用可解压缩和解压缩并将由解压缩变换代表数据表示的变换应用于解压缩版本的方法和装置 图像数据。 上述处理的结果是根据由先前附加到图像数据的信息指定的变换来变换图像数据。