公开(公告)号：US11995487B2

公开(公告)日：2024-05-28

申请号：US18018763

申请日：2021-01-22

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

Inventor： Kiyoun Lee ,  Kimin Kang ,  Yousun Bang

IPC: G06K15/02 ,  G03G15/00 ,  G06K15/00

CPC classification number: G06K15/027 ,  G03G15/5016 ,  G06K15/002 ,  G06K15/1881

Abstract: An example operation method of an image forming apparatus includes forming a test image with respect to a pattern used for diagnosing an image-quality state of a printout output by the image forming apparatus, obtaining a test signal corresponding to the test image via a sensor of the image forming apparatus, obtaining image-quality state information indicating an image-quality state of the test image based on the test signal corresponding, identifying a type of a screen corresponding to halftone information indicating a resolution of the printout based on the image-quality state information, and performing a first image forming operation according to the type of the screen.

公开(公告)号：US20210383177A1

公开(公告)日：2021-12-09

申请号：US16604177

申请日：2018-08-01

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

Inventor： Mark Shaw ,  Kenneth Scott Line ,  Kimin Kang ,  Hae-Kee Lee

IPC: G06K15/12 ,  B41J2/52 ,  G06K15/02 ,  B41J2/47

Abstract: Examples described herein relate to a system consistent with the disclosure. For instance, the system may comprise a printing device including hardware to form an image on a print medium, a memory resource, and a controller to receive a print job to form the markings on the print medium, designate a pixel of the received print job to form a covert dot pattern on the markings, where the pixel corresponds to a first laser intensity level; and adjust a laser intensity of the printing device to a second laser intensity level based on the first laser intensity level of the designated pixel to form the covert dot pattern.

公开(公告)号：US10990860B2

公开(公告)日：2021-04-27

申请号：US16621075

申请日：2018-06-01

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

Inventor： Eunah Song ,  Kimin Kang ,  Minki Cho ,  Yousun Bang ,  Seongwook Han

IPC: G06K15/02 ,  G03G15/00 ,  G06T7/00 ,  G03G15/01 ,  G06K15/12

Abstract: An image forming apparatus is provided. The image forming apparatus includes an image former to change a transfer condition while printing a calibration chart in which patches of different colors are repeatedly arranged in a sub-scanning direction, a scanner to scan the printed calibration chart, and a processor to determine an image defect under each transfer condition using the scanned calibration chart, and to set a transfer condition of the image former based on the determined image defect.

公开(公告)号：US11281946B2

公开(公告)日：2022-03-22

申请号：US16604177

申请日：2018-08-01

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

Inventor： Mark Shaw ,  Kenneth Scott Line ,  Kimin Kang ,  Hae-Kee Lee

IPC: G06K15/02 ,  G06K15/12 ,  B41J2/44 ,  B41J2/47 ,  B41J2/475 ,  B41J2/52

Abstract: Examples described herein relate to a system consistent with the disclosure. For instance, the system may comprise a printing device including hardware to form an image on a print medium, a memory resource, and a controller to receive a print job to form the markings on the print medium, designate a pixel of the received print job to form a covert dot pattern on the markings, where the pixel corresponds to a first laser intensity level; and adjust a laser intensity of the printing device to a second laser intensity level based on the first laser intensity level of the designated pixel to form the covert dot pattern.