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.