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    Printing using fiducial marks
    14.
    发明授权
    Printing using fiducial marks 有权

    公开(公告)号：US11113010B2

    公开(公告)日：2021-09-07

    申请号：US16074405

    申请日：2016-05-16

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

    Inventor： Xavier Domingo ,  Li Qian ,  Secundino Vicente Vicente

    IPC: G06F3/12

    Abstract: Examples herein provide a method, which includes printing an image and fiducial marks on a first side of a print medium. The fiducial marks include first marks ahead of the image, wherein two of the first marks are end marks at a first distance from respective opposite edges of the print medium, and each first mark has a first length and is located at a second distance from a beginning edge of the image. The fiducial marks also include second marks along a length of the print medium, wherein each second mark is at the first distance from the respective opposite edges, has a second length smaller than the first length, and is at a third distance from another second mark. The method includes scanning the fiducial marks and printing a registered mirrored copy of the image on the second side of the print medium using the scanned fiducial marks.

    Image generation on a transparent or semitransparent substrate
    15.
    发明授权
    Image generation on a transparent or semitransparent substrate 有权

    公开(公告)号：US10940697B2

    公开(公告)日：2021-03-09

    申请号：US16977736

    申请日：2018-04-23

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

    Inventor： Li Qian ,  Mihail Zverev ,  Eduardo Amela Conesa

    IPC: B41J3/60 ,  B41J29/393 ,  B41J2/21 ,  B41J3/407

    Abstract: A method of generating an image on a transparent or semitransparent substrate, the method comprising analyzing a first image to be printed on a first side of the substrate to identify a region associated with a predominant color, printing, on the first side of the substrate a color patch with the identified predominant color, printing, on a second side of the substrate, a test color pattern overlapping with the color patch on the first side of the substrate, determining, in a transmission geometry, a color distribution in the color patch, and generating from the determined color distribution, for the region associated with the predominant color identified in the first image, a transmission mode color profile for printing on the second side of the substrate.

    Determining alignment using fiducials
    19.
    发明授权
    Determining alignment using fiducials 有权

    公开(公告)号：US11577527B2

    公开(公告)日：2023-02-14

    申请号：US17258505

    申请日：2019-03-11

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

    Inventor： Li Qian ,  Xavier Domingo Reguant ,  Secundino Vicente Vicente

    IPC: B41J3/60 ,  B41J11/46 ,  B41J3/54 ,  H04N1/00

    Abstract: A print apparatus is disclosed. In some examples, the print apparatus comprises a print head to deposit print agent onto a substrate; a detector to detect a fiducial; a first light source to back-illuminate the substrate, such that light from the first light source is to be detected by the detector through the substrate; and processing apparatus. The processing apparatus is to operate the print head to deposit print agent to form a first fiducial on a first side of the substrate, the first fiducial comprising a shape of a first colour and having a first dimension, and a background of print agent of a second, different colour, wherein the first dimension of the shape does not exceed a corresponding dimension of the background; operate the print head to deposit print agent to form a second fiducial on a second, opposite side of the substrate, the second fiducial comprising an inverted version of the shape of the first colour; operate the first light source to back-illuminate the substrate; operate the detector to detect the first and second fiducials; and determine whether the first fiducial is aligned with the second fiducial. A method and a machine-readable medium are also disclosed.

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