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    ERROR DIFFUSION FOR PRINTING
    22.
    发明申请
    ERROR DIFFUSION FOR PRINTING 有权

    公开(公告)号：US20210099613A1

    公开(公告)日：2021-04-01

    申请号：US17051775

    申请日：2018-08-30

    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

    Inventor： Peter MOROVIC ,  Jan MOROVIC

    IPC: H04N1/52 ,  H04N1/405 ,  H04N19/176

    Abstract: There are disclosed techniques for error diffusion for printing.
    For example, there is disclosed a device comprising a pixel selector, to select a pixel from an image to be printed, wherein the pixel is associated to a group of device state probabilities, wherein each device state probability describes a probability of choosing a particular device state, wherein each device state describes the quantity of each colorant to be used in correspondence of the pixel.
    The device may comprise a device state determiner, to choose the device state for the selected pixel on the basis of the device state probabilities associated to the selected pixel. The device may comprise a feedback chain, to diffuse device state probability errors to pixels to be subsequently selected. The feedback chain may include a selected pixel error determiner, to determine device state probability errors for each device state probability of the selected pixel. The feedback chain may include a neighbouring pixel selector, to choose neighbouring pixels among the pixels to be subsequently selected. The feedback chain may include a neighbouring pixel error modifier, to modify, for each neighbouring pixel, the determined device state probability errors according to criteria conditioned by metrics and/or classification data associated to the selected pixel and/or a group of previously selected pixels and the relative position between the neighbouring pixel and the selected pixel. The feedback chain may include an error diffuser, to diffuse the modified device state probability errors to the neighbouring pixels.

    PRINTER CALIBRATION
    23.
    发明申请
    PRINTER CALIBRATION 有权

    公开(公告)号：US20210004654A1

    公开(公告)日：2021-01-07

    申请号：US16976876

    申请日：2018-03-08

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Peter MOROVIC ,  Jan MOROVIC ,  Pere GASPARIN TALARN ,  Victor DIEGO GUTIERREZ ,  Javier MAESTRO GARCIA

    IPC: G06K15/02 ,  G06K15/00

    Abstract: Certain examples described herein relate to printer calibration. In some cases, adjustment data is received, indicating an adjustment to be applied to a given colorant. A Neugebauer Primary area coverage (NPac) vector defining an operating set of Neugebauer Primaries (NPs) is obtained. Configuration data is determined, dependent on the operating set of NPs. The configuration data maps colorant adjustments to relationships between NPs in the operating set, for both an increase and a decrease in the given colorant. In some cases, the configuration data and the adjustment parameters are used to identify first and second subsets of the operating set of NPs. The NPac vector is adjusted by decreasing an area coverage of an NP in the first subset and complementarily increasing an area coverage of an NP in the second subset.

    HALFTONE MATRICES COMPRISING DISTRIBUTED THRESHOLD VALUES
    24.
    发明申请
    HALFTONE MATRICES COMPRISING DISTRIBUTED THRESHOLD VALUES 审中-公开

    公开(公告)号：US20200304681A1

    公开(公告)日：2020-09-24

    申请号：US16089615

    申请日：2016-10-25

    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

    Inventor： Peter MOROVIC ,  Jan MOROVIC ,  Tsuyoshi YAMASHITA ,  Jake WRIGHT

    IPC: H04N1/405 ,  B29C64/386 ,  H04N1/52

    Abstract: In an example, a method includes acquiring data representing an article to be printed. The data may include at least one element set associated with print addressable location(s) and comprising a first and second element. The elements each identify a print material or print material combination and is each associated with a probability that the print material or print material combination identified thereby is to be applied to the associated print addressable location. A halftone matrix may be acquired comprising threshold values of a first and second value range. The threshold values of the first and second value range are distributed according to a first and second distribution pattern respectively. The halftone matrix may be applied to the data to determine print instructions to distribute the print material or print material combination identified by the first and second element according to the first and second distribution patterns respectively.

    THREE-DIMENSIONAL HALFTONING
    25.
    发明申请
    THREE-DIMENSIONAL HALFTONING 审中-公开

    公开(公告)号：US20190238716A1

    公开(公告)日：2019-08-01

    申请号：US16298790

    申请日：2019-03-11

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Peter MOROVIC ,  Jan MOROVIC ,  Jay S. GONDEK

    IPC: H04N1/405 ,  B33Y50/00

    CPC classification number: H04N1/405 ,  B29C64/112 ,  B29C64/165 ,  B29C64/386 ,  B33Y50/00

    Abstract: According to examples, area coverage vectors for each pixel on each slice of a digital representation of an object may be determined and a two-dimensional halftone matrix including threshold values may be subdivided into a plurality of sub-matrices, each sub-matrix including threshold values of the halftone matrix in a respective value sub-range. In addition, for each of the slices, a sub-matrix of the plurality of sub-matrices may be selected and the area coverage vectors for the pixels in the slice may be halftoned using respective threshold values of the selected sub-matrix.

    MAPPING RESOURCES
    26.
    发明申请
    MAPPING RESOURCES 审中-公开

    公开(公告)号：US20190152156A1

    公开(公告)日：2019-05-23

    申请号：US16097687

    申请日：2016-07-21

    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

    Inventor： Peter MOROVIC ,  Jan MOROVIC ,  Ingeborg TASTL ,  Melanie M. GOTTWALS ,  Andrew E. FITZHUGH ,  Gary J. DISPOTO ,  Lihua ZHAO

    IPC: B29C64/393 ,  B33Y50/02 ,  G05B19/4099

    Abstract: In an example, a processing apparatus includes an interface to receive data representing a three-dimensional object. The data includes an object description comprising object property data. The processing apparatus comprises a mapping module to map the object description to an object generation description which includes at least one print material instruction associated with a predetermined combination of print materials from a set of print materials. The mapping module includes a plurality of mapping resources and each mapping resource associates combinations of print materials from the set of print materials with values of at least one object property. At least one object property of one mapping resource is different to at least one object property of another mapping resource. The processing apparatus also includes a selection module to select, for at least part of the object, one of the plurality of mapping resources to carry out mapping of the object description.

    GENERATING PRINT AGENT ELEMENT SETS
    30.
    发明申请
    GENERATING PRINT AGENT ELEMENT SETS 有权

    公开(公告)号：US20220368812A1

    公开(公告)日：2022-11-17

    申请号：US17771396

    申请日：2019-11-18

    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

    Inventor： Peter MOROVIC ,  Jan MOROVIC ,  Alessandro BELTRAMI ,  Sergio ETCHEBEHERE JUAN ,  Xavier FARINA VARGAS ,  Hector GOMEZ MINANO ,  Joan VIDAL FORTIA

    IPC: H04N1/60 ,  H04N1/52 ,  B33Y50/00 ,  B29C64/386

    Abstract: A method is disclosed. According to some examples, the method comprises determining, by processing circuitry, a first element set to be associated with a print addressable location, the first element set comprising a first plurality of elements, wherein each element of the first plurality of elements identifies a print colorant or print colorant combination and is associated with a probability that the print colorant or print colorant combination identified by that element is to be applied to the associated print addressable location. The method may comprise determining, by processing circuitry, a second element set to be associated with the print addressable location, the second element set comprising a second plurality of elements, wherein each element of the second plurality of elements identifies a print agent or print agent combination and is associated with a probability that the print agent or print agent combination identified by that element is to be applied to the associated print addressable location. The method may comprise determining, by processing circuitry, a combined element set based on the first element set and the second element set. An apparatus and a machine-readable medium are also disclosed.

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