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1.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。
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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。
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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。
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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
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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。
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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。
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公开(公告)号：US06334001B2
公开(公告)日：2001-12-25
申请号：US09733860
申请日：2000-12-07
IPC分类号： G06K936
CPC分类号： H04N1/40062 , G06T7/11 , G06T2207/10008 , G06T2207/20052 , G06T2207/30176
摘要： A method and apparatus for compressing a mixed raster content image that represents a color or gray scale a document is disclosed. The pixel map is decomposed into a three-plane representation—a reduced-resolution “upper” plane, a reduced-resolution “lower” plane, and a high-resolution binary selector plane. An iterative smoothing technique is then used to pre-process the upper and lower planes using the information contained in the selector plane, thereby reducing the amount of data that will be subjected to further processing.
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8.发明授权Minimal buffering method and system for optimized encoding tables in JPEG compression 失效JPEG压缩优化编码表的最小缓冲方法和系统
公开(公告)号：US6081211A
公开(公告)日：2000-06-27
申请号：US56747
申请日：1998-04-08
CPC分类号： H04N19/192 , H04N19/146 , H04N19/60
摘要： An apparatus, method and system optimizes Huffman codes within the Huffman tables without requiring buffering an entire uncompressed original image. Compression of a whole image is performed prior to storage in a buffer. Therefore, the necessary buffer size for performing computation of symbol frequencies in order to optimize Huffman codes is reduced. Default Huffman codes are used to pre-compress the image for storage in the buffer. Simultaneously, the input symbol frequency is determined to produce optimized Huffman codes. The optimized Huffman codes are used to optimally re-encode the encoded image data to reduce the space of the re-encoded data. The optimally encoded image data can then be stored and/or transmitted.
摘要翻译： 装置，方法和系统优化霍夫曼表内的霍夫曼码，而不需要缓冲整个未压缩的原始图像。 在存储在缓冲器中之前执行整个图像的压缩。 因此，为了优化霍夫曼码，用于执行符号频率的计算所需的缓冲器大小被减小。 默认的霍夫曼码用于预压缩图像以存储在缓冲区中。 同时，确定输入符号频率以产生优化的霍夫曼码。 优化的霍夫曼码用于对编码的图像数据进行最佳重新编码，以减少再编码数据的空间。 然后可以存储和/或发送最佳编码的图像数据。
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公开(公告)号：USH1684H
公开(公告)日：1997-10-07
申请号：US537056
申请日：1995-09-29
摘要： A method of fast decompressing a document image compressed using transform coding for scaling and previewing purposes. A fast algorithm is derived by utilizing a fraction of all available transform coefficients representing the image. The method is particularly efficient using the discrete cosine transform which is used in the JPEG ADCT algorithm. In JPEG ADCT, a very fast and efficient implementation is derived for a resolution reduction factor of 16 to 1 (4 to 1 in each direction) without needing any floating point arithmetic operations.
摘要翻译： 一种使用变换编码对缩放和预览目的进行压缩的文档图像进行快速解压缩的方法。 通过利用表示图像的所有可用变换系数的一部分来导出快速算法。 该方法使用JPEG ADCT算法中使用的离散余弦变换特别有效。 在JPEG ADCT中，导出了非常快速和有效的实现，用于16到1的分辨率缩减因子（在每个方向上为4比1），而不需要任何浮点算术运算。
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公开(公告)号：US06778301B2
公开(公告)日：2004-08-17
申请号：US09731130
申请日：2000-12-06
IPC分类号： H04N141
CPC分类号： G06T3/0025
摘要： A method of deriving a preview image from CCITT-compressed digital image data that represent an original image is disclosed. The method comprises receiving CCITT-compressed image data that represent an original image having Nr rows and Nc columns. Without decompressing the CCITT-compressed data, a preview image is derived that has Nr/M rows each having Nc/M pixel values. The reducing step includes processing each group of M rows of said original image represented in the CCITT-compressed data. Specifically, the CCITT-compressed data that represent the group of M rows of the original image is read. For each constituent row in the group of M rows, a location in the row is derived for each transition represented in the CCITT-compressed data. For each constituent row in the group of M rows, each transition in the row is mapped to a pixel value in a reduced row having Nc/M pixel values. Therefore, for each group of M rows in the original image, M reduced rows are defined. In each case, the M reduced rows are combined by averaging or the like into a single preview row having Nc/M preview pixel values. The preview image is assembled from Nr/M preview rows.
摘要翻译： 公开了一种从表示原始图像的CCITT压缩的数字图像数据中导出预览图像的方法。 该方法包括接收表示具有N行和Nc列的原始图像的CCITT压缩图像数据。 在不解压缩CCITT压缩数据的情况下，导出具有每个具有Nc / M个像素值的Nr / M行的预览图像。 缩小步骤包括处理在CCITT压缩数据中表示的所述原始图像的每组M行。 具体地，读取表示原始图像的M行组的CCITT压缩数据。 对于M行组中的每个组成行，针对CCITT压缩数据中表示的每个转换导出行中的位置。 对于M行组中的每个构成行，行中的每个转换被映射到具有Nc / M个像素值的缩小行中的像素值。 因此，对于原始图像中的每组M行，定义M个缩小的行。 在每种情况下，通过平均等将M个缩小的行组合成具有Nc / M个预览像素值的单个预览行。 预览图像由Nr / M预览行组合。
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