公开(公告)号：US20230396717A1

公开(公告)日：2023-12-07

申请号：US18031931

申请日：2021-01-29

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

Inventor： Kiyoun LEE ,  Minki CHO

IPC: H04N1/00

CPC classification number: H04N1/00037 ,  H04N1/00092 ,  H04N1/00018 ,  H04N1/00015

Abstract: An example image forming apparatus includes an image forming unit to form an image on a print medium, a verification scanning unit to scan a first surface of the print medium on which an image has been formed and to scan a second surface on which no image has been formed, and a processor to determine, based on information on a position of a streak included in a scanned image of the first surface or the second surface, whether the streak has been caused by an image forming unit or the verification scanning unit.

公开(公告)号：US20230297797A1

公开(公告)日：2023-09-21

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 ,  G06K15/00 ,  G03G15/00

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

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.