-
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。
-
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：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.
-
4.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。
-
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。
-
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。
-
公开(公告)号：US06272255B1
公开(公告)日：2001-08-07
申请号：US09731585
申请日：2000-12-07
IPC分类号： G06K936
摘要： An improved technique for processing a color or gray scale pixel map representing 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. The “upper” and “lower” planes contain the color or gray scale for the page as well as the continuous tone pictures that are contained on the page. The selector plane stores information for selecting from either the foreground plane or background plane during decompression. Information contained in the selector plane is first used to pre-process the upper and lower planes to reduce the amount of data on each of the other two planes that will be subjected to further processing. Each of the pre-processed planes is compressed using a compression technique optimal for the type of data that resides upon it.
-
8.发明授权公开(公告)号：US06272251B1
公开(公告)日：2001-08-07
申请号：US09211780
申请日：1998-12-15
IPC分类号： G06K936
摘要： A method and apparatus for insertion of a secondary digital image, such as a digital image of a photograph or the like, into a base digital image without requiring the base document image data to be decompressed for purposes of locating the appropriate paste location or to perform the actual electronic pasting operation. The JPEG or otherwise compressed base digital image is segmented into information areas and background areas without decompressing the base digital image so that each background area is identified as a potential paste location for the compressed secondary digital image. The segmentation operation is performed on the basis of the encoding “cost” of each block and the DC coefficient of the block. Without decompressing the base digital image, a select background area is identified therein which is sufficiently large to receive the compressed secondary digital image. The compressed secondary image is pasted into the identified select background area of the compressed base digital image without decompressing either the base or the secondary images.
摘要翻译： 用于将次要数字图像（诸如照片的数字图像等）插入到基本数字图像中的方法和装置，而不需要基本文件图像数据被解压缩以便定位适当的粘贴位置或执行 实际电子粘贴操作。 JPEG或其他压缩的基本数字图像被分割成信息区域和背景区域，而不对基本数字图像进行解压缩，使得每个背景区域被识别为压缩次级数字图像的潜在粘贴位置。 基于每个块的编码“成本”和块的DC系数执行分割操作。 在不对基本数字图像进行解压缩的情况下，在其中识别足够大的选择背景区域以接收压缩的次级数字图像。 将压缩的二次图像粘贴到压缩的基本数字图像的识别的选择背景区域中，而不对基本图像或次要图像进行解压缩。
-
9.发明授权Using encoding cost data for segmentation and background suppression in JPEG-compressed images 失效使用JPEG压缩图像中的分割和背景抑制的编码成本数据
公开(公告)号：US5854857A
公开(公告)日：1998-12-29
申请号：US721074
申请日：1996-09-26
CPC分类号： H04N1/40062 , H04N19/126 , H04N19/85 , H04N19/124 , H04N19/20 , H04N19/60
摘要： An enhancement to the standard JPEG image data compression technique includes a step of recording the length of each string of bits corresponding to each block of pixels in the original image at the time of compression. The list of lengths of each string of bits in the compressed image data is retained as an "encoding cost map" or ECM. The ECM, which is considerably smaller than the compressed image data, can be transmitted or retained in memory separate from the compressed image data along with some other accompanying information and is used as a "key" for editing or segmentation of the compressed image data. The ECM, in combination with a map of DC components of the compressed image, can also be used for substituting background portions of the image with blocks of pure white data, in order to compress certain types of images even further.
摘要翻译： 对标准JPEG图像数据压缩技术的增强包括在压缩时记录与原始图像中的每个像素块相对应的每个比特串的长度的步骤。 压缩图像数据中的每个比特串的长度列表被保留为“编码成本图”或ECM。 比压缩图像数据小得多的ECM可以与压缩图像数据一起发送或保留在存储器中，并与其他一些附带的信息一起被用作压缩图像数据的编辑或分割的“键”。 ECM与压缩图像的DC分量的映射结合也可以用于用纯白色数据块代替图像的背景部分，以便进一步压缩某些类型的图像。
-
公开(公告)号：US06795211B1
公开(公告)日：2004-09-21
申请号：US09433228
申请日：1999-11-04
IPC分类号： G06K1502
CPC分类号： G06T3/4007 , G06T9/00 , H04N1/40068
摘要： A system is disclosed for enhancing resolution of compressed image data. All operations in the present invention are performed in the CCITT compressed domain. For the purpose of the present invention, the input image data is compressed which is mapped to the transitions of the input line. A line is interpolated between the input lines and the transitions of the interpolated line are determined according to the positional difference of transitions in input lines. The transitions of each line in resolution enhanced data are encoded into a compressed codes.
摘要翻译： 公开了一种用于增强压缩图像数据分辨率的系统。 本发明中的所有操作都在CCITT压缩域中执行。 为了本发明的目的，压缩输入图像数据，其被映射到输入线的转变。 根据输入行中的转换的位置差，在输入行之间插入一行并且插入行的转换被确定。 分辨率增强数据中每行的转换被编码成压缩码。
-
-
-
-
-
-
-
-
-
搜索结果
252 条记录 (耗时 0.037 秒)
