公开(公告)号：US20240212129A1

公开(公告)日：2024-06-27

申请号：US18394714

申请日：2023-12-22

Applicant: MITUTOYO CORPORATION

Inventor： Kasumi KONDO ,  Hiroaki KAWATA ,  Masaoki YAMAGATA ,  Jota MIYAKURA

IPC: G06T7/00

CPC classification number: G06T7/001 ,  G06T2207/20168 ,  G06T2207/30164

Abstract: An inspection method includes an image-data acquisition step of acquiring data about an image of a disk-shaped graduation plate as disk-shaped graduation-plate image data, and a polar-coordinate transformation step of transforming the disk-shaped graduation-plate image data into polar coordinates using a center of the disk-shaped graduation plate as a reference to generate polar-coordinate graduation image data. A defect detection step includes a processing-region setting step of setting a processing region for each of graduation line on a polar-coordinate angle display axis, a center-of-gravity calculation step of calculating a center of gravity for each processing region, and a center-of-gravity pitch calculation step of calculating a pitch of the center of gravity calculated in the center-of-gravity calculation step. the defect detection is executed by comparing a pitch of graduations in the polar-coordinate graduation image data with a predetermined reference value

公开(公告)号：US20240212126A1

公开(公告)日：2024-06-27

申请号：US18394612

申请日：2023-12-22

Applicant: MITUTOYO CORPORATION

Inventor： Kasumi KONDO ,  Hiroaki KAWATA ,  Masaoki YAMAGATA ,  Jota MIYAKURA

IPC: G06T7/00 ,  G01D18/00 ,  G06T7/60

CPC classification number: G06T7/0006 ,  G01D18/00 ,  G06T7/60 ,  G06T2207/30108

Abstract: There is provided an inspection method of inspecting a disk-shaped graduation plate accurately and efficiently. An inspection method includes an image-data acquisition step of acquiring data about an image of a disk-shaped graduation plate as disk-shaped graduation-plate image data, and a polar-coordinate transformation step of transforming the disk-shaped graduation-plate image data into polar coordinates using a center of the disk-shaped graduation plate as a reference to generate polar-coordinate graduation image data. A defect detection step includes a processing-region setting step of setting a processing region on a polar-coordinate angle display axis, a center-of-gravity calculation step of calculating a center of gravity for each processing region, and a center-of-gravity pitch calculation step of calculating a pitch of the center of gravity calculated in the center-of-gravity calculation step.

公开(公告)号：US20250005793A1

公开(公告)日：2025-01-02

申请号：US18754677

申请日：2024-06-26

Applicant: MITUTOYO CORPORATION

Inventor： Masaaki SHIMIZU ,  Kasumi KONDO

IPC: G06T7/73 ,  G06T7/00 ,  G06T7/13 ,  G06T7/60 ,  H04N23/72

Abstract: A graduation-plate posture inspection method includes an image data acquiring step of acquiring image data on the graduation plate from the camera, a region calculating step of extracting a first contrast region and a second contrast region in the image data, and a contrast processing step of contrasting the first contrast region with the second contrast region based on brightness or color. The contrast processing step includes calculating a difference between pixel values or luminance values of adjacent pixels in each of the first contrast region and the second contrast region to contrast a magnitude of the difference in the first contrast region with a magnitude of the difference in the second contrast region. The relative posture between the camera and the graduation plate is inspected based on a contrast result in the contrast processing step.