-
公开(公告)号：US6009192A
公开(公告)日：1999-12-28
申请号：US770765
申请日：1996-12-19
摘要： The present invention is a method for the color correction of digital images that have been compressed. In a preferred embodiment, aspects of the color correction are carried out on the compressed image data to improve computational efficiency. One of a number of alternative methods is employed to accomplish the color correction on lossy or losslessly compressed images. The color transformation process accomplishes color correction on compressed image data in conjunction with compression or decompression operations. A second, simplified phase of the color correction may be applied subsequently to the decompressed image data in certain embodiments. Accordingly, the technique has application to any number of color imaging systems, including digital printers and copiers where there is a necessity to color correct compressed digital images.
摘要翻译： 本发明是一种已被压缩的数字图像的颜色校正方法。 在优选实施例中，对压缩图像数据执行颜色校正的方面以提高计算效率。 采用多种替代方法之一来实现有损或无损压缩图像上的色彩校正。 彩色转换处理结合压缩或解压缩操作对压缩图像数据进行颜色校正。 在某些实施例中，随后可以对解压缩的图像数据应用颜色校正的第二简化阶段。 因此，该技术可应用于任何数量的彩色成像系统，包括需要对正确的压缩数字图像进行着色的数字打印机和复印机。
-
公开(公告)号：US06646762B1
公开(公告)日：2003-11-11
申请号：US09435308
申请日：1999-11-05
IPC分类号： G06F1300
CPC分类号： H04N1/6058
摘要： A color printing process, printing a color image in which out-of-gamut original colors are present. For each pixel defined by an original color which is determined to be out of gamut, a gamut remapping process is applied to map each pixel to a color which is within a printer gamut, remapping said pixels to colors within an output printer gamut. For a given set of gamut remapped pixels, gamut remapped pixel colors are compared with said original pixel colors, to derive a comparison metric. Using the comparison metric, a corrected set of gamut remapped colors is generated. The comparison metric may be subjected to an adaptive filtering process, which strengthens the comparison metric in high frequency image regions to increase its impact on the gamut remapped colors, and weakens the comparison metric in low frequency areas, to weaken its impact on the gamut remapped colors.
摘要翻译： 彩色打印处理，打印出色域原色的彩色图像。 对于被确定为超出色域的原始颜色限定的每个像素，应用色域重新映射处理以将每个像素映射到在打印机色域内的颜色，将所述像素重新映射到输出打印机色域内的颜色。 对于给定的色域重映射像素集合，将色域重新映射的像素颜色与所述原始像素颜色进行比较，以导出比较度量。 使用比较度量，生成校正的色域重映射颜色集合。 比较度量可以进行自适应滤波处理，其加强了高频图像区域中的比较度量，以增加其对色域重映射颜色的影响，并且削弱了低频区域中的比较度量，以削弱其对色域重新映射的影响 颜色。
-
公开(公告)号：US6097838A
公开(公告)日：2000-08-01
申请号：US306162
申请日：1999-05-06
IPC分类号： H04N11/04 , H04N1/41 , H04N1/46 , H04N1/60 , H04N7/30 , G06K9/00 , G03F3/08 , G06K9/36 , G06K9/38 , G06K9/46
摘要： The present invention is a method for the color correction of digital images that have been compressed. In a preferred embodiment, aspects of the color correction are carried out on the compressed image data to improve computational efficiency. One of a number of alternative methods is employed to accomplish the color correction on lossy or losslessly compressed images. The color transformation process accomplishes color correction on compressed image data in conjunction with compression or decompression operations. A second, simplified phase of the color correction may be applied subsequently to the decompressed image data in certain embodiments. Accordingly, the technique has application to any number of color imaging systems, including digital printers and copiers where there is a necessity to color correct compressed digital images
摘要翻译： 本发明是一种已被压缩的数字图像的颜色校正方法。 在优选实施例中，对压缩图像数据执行颜色校正的方面以提高计算效率。 采用多种替代方法之一来实现有损或无损压缩图像上的色彩校正。 颜色转换处理结合压缩或解压缩操作对压缩图像数据进行颜色校正。 在某些实施例中，随后可以对解压缩的图像数据应用颜色校正的第二简化阶段。 因此，该技术适用于任何数量的彩色成像系统，包括数字打印机和复印机，其中需要对正确的压缩数字图像进行着色
-
4.发明授权Gamut mapping preserving local luminance differences with adaptive spatial filtering 失效色域映射保留局部亮度差与自适应空间滤波公开(公告)号：US06954287B1
公开(公告)日：2005-10-11
申请号：US09435256
申请日：1999-11-05
CPC分类号： H04N1/6058
摘要： A color printing process, printing a color image in which out-of-gamut original colors are present. For each pixel defined by an original color which is determined to be out of gamut, a gamut remapping process is applied to map each pixel to a color which is within a printer gamut, remapping said pixels to colors within an output printer gamut. For a given set of gamut remapped pixels, gamut remapped pixel colors are compared with said original pixel colors, to derive a comparison metric. Using the comparison metric, a corrected set of gamut remapped colors is generated. The comparison metric may be subjected to an adaptive filtering process, which strengthens the comparison metric in high frequency image regions to increase its impact on the gamut remapped colors, and weakens the comparison metric in low frequency areas, to weaken its impact on the gamut remapped colors. The filter is selected by determining a filter selection metric in accordance with measured local image activity and changing filter parameters as a function of the determined filter selection metric.
摘要翻译： 彩色打印处理，打印出色域原色的彩色图像。 对于被确定为超出色域的原始颜色限定的每个像素，应用色域重新映射处理以将每个像素映射到在打印机色域内的颜色，将所述像素重新映射到输出打印机色域内的颜色。 对于给定的色域重映射像素集合，将色域重新映射的像素颜色与所述原始像素颜色进行比较，以导出比较度量。 使用比较度量，生成校正的色域重映射颜色集合。 比较度量可以进行自适应滤波处理，其加强了高频图像区域中的比较度量，以增加其对色域重映射颜色的影响，并且削弱了低频区域中的比较度量，以削弱其对色域重新映射的影响 颜色。 通过根据测量的本地图像活动确定滤波器选择度量并根据所确定的滤波器选择度量来改变滤波器参数来选择滤波器。
-
公开(公告)号：US06707938B2
公开(公告)日：2004-03-16
申请号：US09731340
申请日：2000-12-06
IPC分类号： G06K900
CPC分类号： G06K9/00 , G09G5/02 , H04N1/6016 , H04N9/68
摘要： A simplified color space transformation method uses a principal axis or dominating parameter in a first color space to determine the value of an associated axis in a second color space. Transformation curves relating the principal axis to the associated second space axis are predetermined and stored. Each curve describes the relationship between the principal axis and the associated axis given certain values for remaining, secondary or non-principal first color space axes. In operation the non-principal axes are used to calculate index values. For example, the non-principal values are quantized. The index values are used to access an appropriate curve. The principal axis value is used as an index into the appropriate curve. An image processor operative to perform the method comprises a transformation curve library. Software modules running on a computational device, such as, a microprocessor or digital signal processor analyze image pixels and access appropriate curves for use in transforming the pixel into a new color space.
摘要翻译： 简化的颜色空间变换方法使用第一颜色空间中的主轴或主导参数来确定第二颜色空间中相关联的轴的值。 将主轴与相关联的第二空间轴相关联的变换曲线是预定的并被存储。 每个曲线描述了主轴和相关轴之间的关系，给出了剩余的，次要的或非主要的第一个颜色空间轴的某些值。 在运行时，非主轴用于计算指标值。 例如，非主要值被量化。 索引值用于访问适当的曲线。 主轴值用作适当曲线的指标。 可操作以执行该方法的图像处理器包括变换曲线库。 在诸如微处理器或数字信号处理器的计算设备上运行的软件模块分析图像像素并访问适当的曲线以用于将像素转换成新的颜色空间。
-
公开(公告)号：US06195456B1
公开(公告)日：2001-02-27
申请号：US08770768
申请日：1996-12-19
IPC分类号： G06K900
CPC分类号： G06K9/00 , G06T5/007 , G06T5/10 , G06T2207/10024 , G06T2207/20064 , H04N1/6019 , H04N1/603 , H04N1/64
摘要： Color printing systems frequently use multiresolution analysis, which creates intermediate lower resolution images, in applications such as descreening and filtering. The typical steps are to decompose the original image into sub bands, apply the application to one or more sub bands and then recompose the image, prior to color correction and color space transformation. This disclosure describes applying the color correction to one of the lower resolution sub bands and a simpler color space transformation to the final image as a way to reduce the amount of computation. The described multiresolution analysis is a wavelet transform.
摘要翻译： 彩色打印系统经常使用多分辨率分析，在分析和过滤等应用中创建中间较低分辨率的图像。 典型的步骤是将原始图像分解为子带，将应用应用于一个或多个子带，然后在颜色校正和颜色空间转换之前重构图像。 本公开内容描述了将颜色校正应用于较低分辨率子带中的一个，并将更简单的色空间变换应用于最终图像，作为减少计算量的一种方式。 所描述的多分辨率分析是小波变换。
-
7.发明授权公开(公告)号：US07307752B1
公开(公告)日：2007-12-11
申请号：US09566291
申请日：2000-05-05
申请人： Lingappa K. Mestha , Peter A. Crean , Martin S. Maltz , Robert J. Rolleston , Yao Rong Wang , Eric Jackson , Thyagarajan Balasubramanian
发明人： Lingappa K. Mestha , Peter A. Crean , Martin S. Maltz , Robert J. Rolleston , Yao Rong Wang , Eric Jackson , Thyagarajan Balasubramanian
CPC分类号： G06F15/00 , H04N1/4078 , H04N1/6027 , H04N1/6033
摘要： A color marking device including a control system for calibration of the device based upon dynamic color balance control of an output image. The system comprises a front end converter for converting an input signal representative of a target image comprising a preselected color into a device-dependent control signal in accordance with a device TRC, a color marking device for outputting an output image in response to the control signal, a sensor for measuring a parameter from the output image representative of a color of the output image, and, a point-wise controller for comparing the parameter with a corresponding parameter from the target image and constructing adjusted controlled points for the device TRC when the measured parameter and the corresponding parameter vary by a preselected value, a color balance controller for constructing an adjusted device TRC from the controlled points, whereby subsequently generated output images are output with the adjusted device TRC and, more accurately represent target input images.
摘要翻译： 一种彩色标记装置，包括基于输出图像的动态色彩平衡控制来校准装置的控制系统。 该系统包括：前端转换器，用于根据设备TRC将表示包括预选颜色的目标图像的输入信号转换成依赖于设备的控制信号;响应于控制信号输出输出图像的颜色标记装置 ，用于从表示输出图像的颜色的输出图像中测量参数的传感器，以及用于将参数与来自目标图像的相应参数进行比较的逐点控制器，并且当所述设备TRC的调整的控制点在 测量参数和相应的参数由预选值变化，用于从受控点构建调整的设备TRC的色平衡控制器，由此随后生成的输出图像被调整的设备TRC输出，并且更精确地表示目标输入图像。
-
8.发明授权公开(公告)号：US06268939B1
公开(公告)日：2001-07-31
申请号：US09004650
申请日：1998-01-08
IPC分类号： G03F308
CPC分类号： H04N1/60 , H04N1/6058
摘要： The present invention is directed to a method and apparatus for improving the efficiency of color correcting subsampled luminance and chrominance based data. More specifically, the present invention is directed to a method of applying a full conversion between color spaces for one pixel in a selected pixel block. Chrominance values are assigned to the remaining pixels based upon their luminance values relative to the luminance value of the converted pixel. The invention may be used to convert between various types of color spaces, and may be used in the processing of both device dependent and device independent data.
-
公开(公告)号：US5544284A
公开(公告)日：1996-08-06
申请号：US833529
申请日：1992-02-11
CPC分类号： H04N1/644
摘要： A digital color image quantization mechanism employs sequential product code vector quantization, to sequentially extract chrominance and luminance values from the vectors and quantizes chrominance and luminance features based upon a conditional distribution of these features within partitioned regions of chrominance/luminance color space. The mechanism sequentially partitions a histogram of the original digital color image in luminance, chrominance (Y,Cb,Cr) space coordinates into a plurality of sub-regions or color space cells, such that each partitioned color cell is associated with a color of the output palette through which the color composition of a reproduced color image is defined. A splitting criterion determines the sequential order of partitioning of an axis. Because of the increased sensitivity of the human visual system to contouring artifacts in regions of an image to low spatial activity, the splitting criterion along the luminance axis is scaled or weighted in inverse proportion to the average spatial activity of the luminance-chrominance region subject to be split. A map of chrominance and luminance output codes is generated for the respective pixels of the output color image in accordance with the axial splitting or quantization of the chrominance and luminance components of the histogram.
摘要翻译： 数字彩色图像量化机构采用顺序乘积码矢量量化，从色度和亮度色彩空间分割区域内的这些特征的条件分布，顺序地从矢量中提取色度和亮度值，并量化色度和亮度特征。 该机构将亮度，色度（Y，Cb，Cr）空间坐标中的原始数字彩色图像的直方图依次分割成多个子区域或色彩空间单元，使得每个分割的彩色单元与 输出调色板，通过该调色板定义再现的彩色图像的颜色组成。 分割标准确定轴的分割顺序。 由于人类视觉系统对图像区域中的伪像的敏感性增加到低空间活动，所以沿着亮度轴的分割准则被缩放或加权，与受到受限制的亮度色度区域的平均空间活动成反比 分裂 根据直方图的色度和亮度分量的轴向分割或量化，为输出彩色图像的各个像素生成色度和亮度输出代码的映射。
-
公开(公告)号：US06972867B1
公开(公告)日：2005-12-06
申请号：US09710106
申请日：2000-11-10
CPC分类号： H04N1/6033 , H04N2201/3269
摘要： A color calibration job identification system and method are provided, wherein the job identification data is encoded on a printed page, in a patch code, along with color targets, according to a protocol and format approximately identical to a format of the color targets. The patch code comprises a first portion, including a start code, and a second portion, including job identification data. The first portion of the patch code is comprised of two or more small color patches, each having a predefined color. The second portion of the patch code is comprised of two or more small color patches wherein each of the patches is comprised of a color selected from a plurality of colors, wherein each of the colors is indicative of a unique datum value, preferably an octal digit. The system provides a means for determining correct functioning of a printer and a means for determining an orientation of a printed page in a scanning device.
摘要翻译： 提供了一种颜色校准作业识别系统和方法，其中根据与彩色目标的格式大致相同的协议和格式，将作业识别数据与打印页面，拼图代码以及颜色目标一起编码。 补丁码包括包括起始码的第一部分和包括作业识别数据的第二部分。 补丁代码的第一部分由两个或更多个小颜色补丁组成，每个都有一个预定义的颜色。 补丁代码的第二部分由两个或更多个小的色块组成，其中每个补丁由选自多种颜色的颜色组成，其中每种颜色表示唯一的基准值，优选地是八进制数 。 该系统提供用于确定打印机的正确功能的装置和用于确定扫描装置中的打印页面的方位的装置。
-
-
-
-
-
-
-
-
-
搜索结果
37 条记录 (耗时 0.021 秒)
