公开(公告)号：US20250097371A1

公开(公告)日：2025-03-20

申请号：US18968881

申请日：2024-12-04

Applicant: CANON KABUSHIKI KAISHA

Inventor： NAOYA TAKESUE

IPC: H04N1/60

Abstract: Based on scanned data obtained by a scan unit reading a first chart printed and output by a printing unit and colorimetric data obtained by a colorimetry unit measuring the first chart, correction information for correcting a sensed value of the scan unit is generated. The first chart includes a patch extending in a main scanning direction substantially perpendicular to a sheet conveyance direction and having a uniform density, and a position adjustment pattern formed outside the patch for identifying a position in the main scanning direction on the patch. A first generation unit generates the correction information by causing a pixel position of an end portion of the patch in the scanned data and a colorimetry position of an end portion of the patch in the colorimetric data to correspond to each other and determining a corrected value of the sensed value at a specific pixel position.

公开(公告)号：US20240195931A1

公开(公告)日：2024-06-13

申请号：US18524912

申请日：2023-11-30

Applicant: CANON KABUSHIKI KAISHA

Inventor： NAOYA TAKESUE

IPC: H04N1/60

CPC classification number: H04N1/6033 ,  H04N1/6008

Abstract: Based on scanned data obtained by a scan unit reading a first chart printed and output by a printing unit and colorimetric data obtained by a colorimetry unit measuring the first chart, correction information for correcting a sensed value of the scan unit is generated. The first chart includes a patch extending in a main scanning direction substantially perpendicular to a sheet conveyance direction and having a uniform density, and a position adjustment pattern formed outside the patch for identifying a position in the main scanning direction on the patch. A first generation unit generates the correction information by causing a pixel position of an end portion of the patch in the scanned data and a colorimetry position of an end portion of the patch in the colorimetric data to correspond to each other and determining a corrected value of the sensed value at a specific pixel position.

公开(公告)号：US20240106966A1

公开(公告)日：2024-03-28

申请号：US18472905

申请日：2023-09-22

Applicant: CANON KABUSHIKI KAISHA

Inventor： NAOYA TAKESUE ,  FUMITAKA GOTO

IPC: G06K15/02 ,  G06K15/00 ,  G06K15/10

CPC classification number: G06K15/188 ,  G06K15/005 ,  G06K15/027 ,  G06K15/102

Abstract: There is a possibility that the accuracy of color adjustment decreases due to high-frequency density unevenness on a test chart that is used in a case where sensor reading characteristics are obtained. The present disclosure solves this by correction processing (generating a correction table for sensor shading correction processing) of a reading sensor configuring a scan unit after removing high-frequency density unevenness in advance by performing color adjustment processing (head shading correction processing).