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公开(公告)号：US20190279054A1
公开(公告)日：2019-09-12
申请号：US16345898
申请日：2017-02-10
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Peter Morovic , Jan Morovic , Hector Gomez Minano
Abstract: A method of calibrating a printing system. Data defining a color mapping that maps a first set of n-dimensional color Input points to a corresponding second set of n-dimensional color output points, the color mapping representing a measured behavior of the printing system, is obtained. A smoothed mapping function of color input points that satisfies a predetermined optimization condition based on a mapping error between the smoothed mapping function and the color mapping is determined. The mapping error is a function of individual errors between outputs of the smoothed mapping function as applied to respective color input points in the first set of color input points and corresponding color output points from the second set of color output points as mapped from the respective color input points by the color mapping. The smoothed mapping function is used to calibrate the printing system.
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公开(公告)号：US20190238723A1
公开(公告)日：2019-08-01
申请号：US16327398
申请日：2016-10-24
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Peter Morovic , Jan Morovic , Hector Gomez Minano , Javier Maestro Garcia
Abstract: A method of obtaining a calibration factor for color calibration of a printing system. The method includes printing, using the printing system, a plurality of Neugebauer primaries (NPs) each defined by a respective Neugebauer primary area coverage (NPac) vector. For each of the NPs, an area coverage change of the NP is determined from a measurement of a visual property for the NP and a measurement of the visual property for a corresponding reference NP corresponding to the respective NPac vector. The calibration N factor for the printing system is obtained based on the area coverage change for respective NPs of the plurality of NPs.
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公开(公告)号：US20220030134A1
公开(公告)日：2022-01-27
申请号：US17311174
申请日：2019-01-10
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Sergio Etchebehere Juan , Peter Morovic , Jan Morovic , Hector Gomez Minano
Abstract: Certain examples described herein relate to adjusting a printing system. In certain cases, a lookup table, LUT, is obtained where the lookup table comprises a plurality of nodes that map a plurality of input first color space values to a plurality of Neugebauer Primary area coverage, NPac, vectors in a second color space and each NPac vector comprises at least one Neugebauer Primary, NP. Each NPac vector in the LUT is adjusted by the determination of a colorimetric value of the NPac vector and the modification of the NPac vector based on a characteristic of the corresponding at least one NP and the colorimetric value such that the modification is specific to the NPac vector. The lookup table is updated with the modified NPac vector and stored for referral by the printing system in any future printing.
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公开(公告)号：US10647138B2
公开(公告)日：2020-05-12
申请号：US16326818
申请日：2016-10-21
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Peter Morovic , Jan Morovic , Jordi Arnabat Benedicto , Hector Gomez Minano
IPC: B41J29/393 , B41J2/21 , B41J2/045 , B41J2/155
Abstract: An apparatus and method for use in generating calibration parameters for a printing apparatus comprising a plurality of print modules are disclosed. The method comprises printing a first plurality of test patches for each print module of the plurality of print modules, analysing the first plurality of test patches to identify at least two clusters of print modules, wherein each cluster comprises a sub-group of print modules having substantially similar performance, printing a second plurality of test patches comprising an extended calibration test patch set for each cluster of print modules, the second plurality of test patches being distributed across the print modules of the cluster, and analysing extended calibration test patch set for each cluster to determine a calibration parameter for the printing apparatus.
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公开(公告)号：US12166945B1
公开(公告)日：2024-12-10
申请号：US18473497
申请日：2023-09-25
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Peter Morovic , Jan Morovic , Hector Gomez Minano , Sergio Etchebehere Juan
Abstract: Systems, apparatuses, and methods may provide for technology to control the printing of halftoning screen signatures for various levels of prints. For example, such prints may include regular edition prints or limited edition prints. During printing, a first halftoning screen is associated with one or more of the regular edition prints and a second halftoning screen is associated with the limited edition print, in some implementations. The second halftoning screen has a spatial frequency that is substantially the same as the first halftoning screen while having a spatial signature different from the first halftoning screen. Additionally, the second halftoning screen further may have spectral properties that are substantially the same as the first halftoning screen. During printing, two different printed copies of an image are formed using the first halftoning screen and the second halftoning screen.
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Patent Agency Ranking
公开(公告)号：US11381712B2
公开(公告)日：2022-07-05
申请号：US16098101
申请日：2016-07-13
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Jan Morovic , Hector Gomez Minano , Peter Morovic
Abstract: A method is described in which sets of corresponding colorimetric values are obtained. In a set, a colorimetric value is associated with a device color. A number of device colors are selected according to the color differences between colorimetric values associated with the same device color. A color calibration pattern is elaborated for a printer to be calibrated using the selected device colors and calibration is performed using the sets of colorimetric values.
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公开(公告)号：US20220166901A1
公开(公告)日：2022-05-26
申请号：US17418063
申请日：2019-08-12
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Peter Morovic , Jan Morovic , Hector Gomez Minano
IPC: H04N1/60
Abstract: In an example, a method includes obtaining, by a processor, a first set of vertices of a set of simplexes defining a hull of an initial color gamut. A value representing a size of a first simplex of the set of simplexes may be determined and compared to a first threshold. When the determined value is less than the first threshold, at least one vertex of the first simplex may be removed from the first set of vertices to determine a modified color gamut hull.
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公开(公告)号：US20220131998A1
公开(公告)日：2022-04-28
申请号：US17419390
申请日：2019-07-15
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Peter Morovic , Jan Morovic , Sergio Etchebehere Juan , Tanausu Ramirez Garcia , Hector Gomez Minano
Abstract: Certain examples relate to a method of color prediction. Data indicative of color characteristics measured from a number of color test patches is obtained. Data indicative of combinations of color resources used to render the color test patches on a color rendering device is obtained. A first predictive model is trained using the data indicative of the combinations of color resources as an input and corresponding data indicative of color characteristics as ground truth outputs. A second predictive model is trained using the output data from the first predictive model as an input and the corresponding data indicative of color characteristics as ground truth outputs. A progressive mapping is implemented by the first and second predictive models to predict color characteristics rendered by the color rendering device given a combination of color resources.
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公开(公告)号：US11283965B2
公开(公告)日：2022-03-22
申请号：US17311041
申请日：2018-12-14
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Hector Gomez Minano , Peter Morovic , Jan Morovic , Sergio Etchebehere Juan
IPC: H04N1/60
Abstract: A print calibration system comprising a printing device to apply print material to a print target in a printing process, a memory for storing a lookup table; and a processor. The processor causes the printing device to print calibration points for reproducing a color ramp, by receiving a plurality of Neugebauer Primary area coverage (‘NPac’) points representing the plurality of calibration points and determining a hue angle and color space based on the NPac points. A plurality of nodes distributed between a first node and a second node of a sectional representation of the NPac points is determined. A lookup table is generated based on a relationship between the plurality of nodes and the NPac points for use during the printing process, wherein the lookup table comprises values to map between a first color space and a second color space, the lookup table is then provided to the printing device.
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公开(公告)号：US20220075572A1
公开(公告)日：2022-03-10
申请号：US17419093
申请日：2019-03-07
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Peter Morovic , Hector Gomez Minano , Jan Morovic , Sergio Etchebehere Juan , Alessandro Beltrami
IPC: G06F3/12
Abstract: Disclosed is an apparatus generate updated sets of printing parameters for a printing process, the apparatus comprising a processor to receive initial correspondence data indicating correspondence between a plurality of color values and respective sets of printing parameters, wherein at least one colorant combination and a respective coefficient is assigned to each of the sets of printing parameters. The processor is to assign a weight to each colorant combination in the initial correspondence data based on at least a printing quality criterion relating to the colorant combinations within the initial correspondence data, and re-assign colorant combinations and respective coefficients to generate updated sets of printing parameters based on the assigned weights. Also disclosed is a method and a non-transitory computer readable storage medium.
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