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公开(公告)号：DE60239571D1
公开(公告)日：2011-05-05
申请号：DE60239571
申请日：2002-08-30
Applicant: XEROX CORP
Inventor： MESTHA LALIT K , DIANAT SOHAIL A
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公开(公告)号：BR0203414A
公开(公告)日：2003-05-27
申请号：BR0203414
申请日：2002-08-28
Applicant: XEROX CORP
Inventor： MESTHA LALIT K , DIANAT SOHAIL A
Abstract: An LED-based spectrophotometer uses a reconstruction algorithm, based on the spectral characteristics of the illumination source and the color sensing system, to convert integrated multiple illuminant measurements from a non-fully illuminant populated color sensor into a fully populated spectral curve using a reference database. The reference database contains training samples that indicate reflectance spectra and their corresponding LED sensor output. A dynamic, Karhunen-Loeve-based (DKL) spectral reconstruction algorithm, used to reconstruct spectra, gives greater importance to the data from the training samples in the neighborhood of the color sample under measurement. This is done using linear operators and basis vectors.
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公开(公告)号：DE60227137D1
公开(公告)日：2008-07-31
申请号：DE60227137
申请日：2002-08-30
Applicant: XEROX CORP
Inventor： MESTHA LALIT K , DIANAT SOHAIL A
Abstract: A spectral determination system, comprising a plurality of illuminants; at least one photodetector that detects light originating from the plurality of illuminants and reflected by a target; and a controller that: normalizes a plurality of illuminant sensor outputs obtained from the at least one photodetector, each illuminant sensor output indicating a reflectance value obtained from a target; obtains reference data from a reference database that correlates reference spectra with a corresponding plurality of normalized illuminant sensor outputs, the reference data including data in a neighborhood of each reflectance value; and determines a spectrum S based on the illuminant sensor outputs and the reference data, wherein the determining step places greater importance on the data in the neighborhood of each reflectance value, wherein the controller performs the determining step based on linear operators, and wherein the linear operators are represented by C i = Z i ¢ B i b i = w i + C i ¢ Z i T B ¢ i + 1 = B i - C ¢ i T ¢ C i / b i D ¢ i + 1 = D i + S i T ¢ Z i / w i where w ( i ) represents a weighting function that places greater importance on the data in the neighborhood of each actual reflectance value, S i is an i th reference spectrum in the reference database, and Z i is an i th normalized illuminant sensor output in the reference database, the linear operators being recursively computed until i = N , where N is a number of spectral samples in the reference database.
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公开(公告)号：BR0203438A
公开(公告)日：2003-05-20
申请号：BR0203438
申请日：2002-08-29
Applicant: XEROX CORP
Inventor： MESTHA LINGAPPA K , DIANAT SOHAIL A
Abstract: A spectral determination system, comprising a plurality of illuminants; at least one photodetector that detects light originating from the plurality of illuminants and reflected by a target; and a controller that: normalizes a plurality of illuminant sensor outputs obtained from the at least one photodetector, each illuminant sensor output indicating a reflectance value obtained from a target; obtains reference data from a reference database that correlates reference spectra with a corresponding plurality of normalized illuminant sensor outputs, the reference data including data in a neighborhood of each reflectance value; and determines a spectrum S based on the illuminant sensor outputs and the reference data, wherein the determining step places greater importance on the data in the neighborhood of each reflectance value, wherein the controller performs the determining step based on linear operators, and wherein the linear operators are represented by C i = Z i ¢ B i b i = w i + C i ¢ Z i T B ¢ i + 1 = B i - C ¢ i T ¢ C i / b i D ¢ i + 1 = D i + S i T ¢ Z i / w i where w ( i ) represents a weighting function that places greater importance on the data in the neighborhood of each actual reflectance value, S i is an i th reference spectrum in the reference database, and Z i is an i th normalized illuminant sensor output in the reference database, the linear operators being recursively computed until i = N , where N is a number of spectral samples in the reference database.
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公开(公告)号：BR0203438B1
公开(公告)日：2014-11-04
申请号：BR0203438
申请日：2002-08-29
Applicant: XEROX CORP
Inventor： MESTHA LINGAPPA K , DIANAT SOHAIL A
Abstract: A spectral determination system, comprising a plurality of illuminants; at least one photodetector that detects light originating from the plurality of illuminants and reflected by a target; and a controller that: normalizes a plurality of illuminant sensor outputs obtained from the at least one photodetector, each illuminant sensor output indicating a reflectance value obtained from a target; obtains reference data from a reference database that correlates reference spectra with a corresponding plurality of normalized illuminant sensor outputs, the reference data including data in a neighborhood of each reflectance value; and determines a spectrum S based on the illuminant sensor outputs and the reference data, wherein the determining step places greater importance on the data in the neighborhood of each reflectance value, wherein the controller performs the determining step based on linear operators, and wherein the linear operators are represented by C i = Z i ¢ B i b i = w i + C i ¢ Z i T B ¢ i + 1 = B i - C ¢ i T ¢ C i / b i D ¢ i + 1 = D i + S i T ¢ Z i / w i where w ( i ) represents a weighting function that places greater importance on the data in the neighborhood of each actual reflectance value, S i is an i th reference spectrum in the reference database, and Z i is an i th normalized illuminant sensor output in the reference database, the linear operators being recursively computed until i = N , where N is a number of spectral samples in the reference database.
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Patent Agency Ranking
公开(公告)号：DE60141998D1
公开(公告)日：2010-06-17
申请号：DE60141998
申请日：2001-01-18
Applicant: XEROX CORP
Inventor： MESTHA LINGAPPA K , DIANAT SOHAIL A
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公开(公告)号：DE60223117T2
公开(公告)日：2008-02-07
申请号：DE60223117
申请日：2002-08-30
Applicant: XEROX CORP
Inventor： MESTHA LALIT K , DIANAT SOHAIL A
IPC: G01J3/46
Abstract: An LED-based spectrophotometer uses a reconstruction algorithm, based on the spectral characteristics of the illumination source and the color sensing system, to convert integrated multiple illuminant measurements from a non-fully illuminant populated color sensor into a fully populated spectral curve using a reference database. The reference database contains training samples that indicate reflectance spectra and their corresponding LED sensor output. A dynamic, Karhunen-Loeve-based (DKL) spectral reconstruction algorithm, used to reconstruct spectra, gives greater importance to the data from the training samples in the neighborhood of the color sample under measurement. This is done using linear operators and basis vectors.
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公开(公告)号：DE60223117D1
公开(公告)日：2007-12-06
申请号：DE60223117
申请日：2002-08-30
Applicant: XEROX CORP
Inventor： MESTHA LALIT K , DIANAT SOHAIL A
IPC: G01J3/46
Abstract: An LED-based spectrophotometer uses a reconstruction algorithm, based on the spectral characteristics of the illumination source and the color sensing system, to convert integrated multiple illuminant measurements from a non-fully illuminant populated color sensor into a fully populated spectral curve using a reference database. The reference database contains training samples that indicate reflectance spectra and their corresponding LED sensor output. A dynamic, Karhunen-Loeve-based (DKL) spectral reconstruction algorithm, used to reconstruct spectra, gives greater importance to the data from the training samples in the neighborhood of the color sample under measurement. This is done using linear operators and basis vectors.
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公开(公告)号：JP2001320597A
公开(公告)日：2001-11-16
申请号：JP2001010930
申请日：2001-01-19
Applicant: XEROX CORP
Inventor： MESTHA LINGAPPA K , DIANAT SOHAIL A
Abstract: PROBLEM TO BE SOLVED: To enhance spectral color matching independently of a device and lighting by using feedback and real time sensing of a spectrophotometer. SOLUTION: A color output spectrally matching is obtained by using data from a real time sensor such as a spectrophotometer on an output tray of a marking unit, for example, to decide an output spectrum of a copied image. An output spectrum of the copied image is compared with that of a target spectrum stored in a memory of a computer in order to generate a mapping table spectrally matching all succeeding color image copies in real time. Thus, the spectrum of an output color matchces between a display and a print, a scanning and a print, a scanning and a display or a copy and a print.
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公开(公告)号：JPH10181104A
公开(公告)日：1998-07-07
申请号：JP31857097
申请日：1997-11-19
Applicant: XEROX CORP
Inventor： MESTHA LINGAPPA K , WANG YAO RONG , DIANAT SOHAIL A , KHARGONEKAR PRAMOD P , KODITSCHEK DANIEL E , JACKSON ERIC , THIERET TRACY E
Abstract: PROBLEM TO BE SOLVED: To obtain a new improved technique for process control by connecting a specified expected tone reproduction curve with a tone reproduction sample to reconstitute a tone reproduction curve and by controlling a machine operation in response to the tone reproduction curve reconstituted. SOLUTION: In a image forming system having a control device comprising a set of actuator for projecting a printed image on a printed image forming surface, a image forming system is modeled with regard to an actuator for forming an expected tone reproduction curve. The expected tone reproduction curve is defined by a formula and an optional tone reproduction sample is obtained. The expected tone reproduction curve is connected with the tone reproduction sample to reconstitute a tone reproduction curve and a machine operation is controlled in response to the tone reproduction curve reconstituted. Here, in the formula, C is TRC measured, C▵ is TRC forecasted and C-is TRC reconstituted.
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