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公开(公告)号：DE60043807D1
公开(公告)日：2010-03-25
申请号：DE60043807
申请日：2000-11-03
Applicant: XEROX CORP
Inventor： BALASUBRAMANIAN RAJA , DE QUEIROZ RICARDO L , ESCHBACH REINER , WU WENCHENG
Abstract: 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.
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公开(公告)号：DE60138240D1
公开(公告)日：2009-05-20
申请号：DE60138240
申请日：2001-05-09
Applicant: XEROX CORP
Inventor： BALASUBRAMANIAN RAJA , WANG SHEN-GE
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公开(公告)号：DE60033484D1
公开(公告)日：2007-04-05
申请号：DE60033484
申请日：2000-11-03
Applicant: XEROX CORP
Inventor： BALASUBRAMANIAN RAJA , DE QUEIROZ RICARDO L , BRAUN KAREN M , ESCHBACH REINER
Abstract: 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.
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公开(公告)号：DE60009644T2
公开(公告)日：2004-08-05
申请号：DE60009644
申请日：2000-12-05
Applicant: XEROX CORP
Inventor： BALASUBRAMANIAN RAJA , BRAUN KAREN M
Abstract: A color printing process, printing a color image in which out-of-gamut original colors are present. Each pixel is reviewed in context of its neighbors prior to remapping, so that a remapping function may take local area information into account in the remapping process.
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公开(公告)号：DE60135178D1
公开(公告)日：2008-09-18
申请号：DE60135178
申请日：2001-05-03
Applicant: XEROX CORP
Inventor： MESTHA LINGAPPA K , CREAN PETER A , MALTZ MARTIN S , ROLLESTON ROBERT J , WANG YAO RONG , JACKSON ERIC , BALASUBRAMANIAN RAJA
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Patent Agency Ranking
公开(公告)号：DE60033484T2
公开(公告)日：2007-05-31
申请号：DE60033484
申请日：2000-11-03
Applicant: XEROX CORP
Inventor： BALASUBRAMANIAN RAJA , DE QUEIROZ RICARDO L , BRAUN KAREN M , ESCHBACH REINER
Abstract: 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.
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公开(公告)号：DE60009644D1
公开(公告)日：2004-05-13
申请号：DE60009644
申请日：2000-12-05
Applicant: XEROX CORP
Inventor： BALASUBRAMANIAN RAJA , BRAUN KAREN M
Abstract: A color printing process, printing a color image in which out-of-gamut original colors are present. Each pixel is reviewed in context of its neighbors prior to remapping, so that a remapping function may take local area information into account in the remapping process.
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公开(公告)号：BR0105437A
公开(公告)日：2002-06-25
申请号：BR0105437
申请日：2001-11-09
Applicant: XEROX CORP
Inventor： VENABLE DENNIS L , BALASUBRAMANIAN RAJA
Abstract: 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.
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公开(公告)号：JP2002209121A
公开(公告)日：2002-07-26
申请号：JP2001323143
申请日：2001-10-22
Applicant: XEROX CORP
Inventor： HANDLEY JOHN C , BALASUBRAMANIAN RAJA
Abstract: PROBLEM TO BE SOLVED: To provide color image processing capable of preparing an image prepared to be visualized on a source device so as to be visualized on a destination device. SOLUTION: A color conversion method is based on the non-separated tile of a color conversion lookup table. Depending on the non-separated tile, the lookup table has minute granularity when needed and has rough granularity when permitted. The non-separated tile of the lookup table improves conversion characteristic due to a given lookup table size. The non-separated tile is enumerated. The tile or a conversion rule is related with a bit position at a bit vector. A common part between regulation lists related with a pixel parameter value is discovered by logical AND calculation concerning a bit vector related with the pixel parameter value.
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公开(公告)号：JP2001197326A
公开(公告)日：2001-07-19
申请号：JP2000364163
申请日：2000-11-30
Applicant: XEROX CORP
Inventor： BALASUBRAMANIAN RAJA , BRAUN KAREN M
Abstract: PROBLEM TO BE SOLVED: To provide a satisfactory color gamut re-mapping method in the case of using the output system of a color gamut different from an original color gamut. SOLUTION: First, the local area of an N×M block surrounding an input pixel Pi is obtained (302). It is given cluster analysis to decide at least one cluster and at last one cluster distance is decided concerning each cluster (304). At least one key color within each cluster is extracted (306), a color gamut mapping function GT is applied (308) to the key color, and a key color having large cluster distribution is moved additionally inside of the color gamut. The key color is adjusted to maintain brightness (310), a mapping vector is generated concerning each key color (312), a target pixel Pi is moved in the distance- weighted average direction of this vector to include a step for re-mapping (316).
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