Patent ID: 11913912
Assignee: INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A hole expansion ratio testing method comprising:
holding a plate member having a hole;
expanding the hole by inserting the punching unit into the interior of the hole;
acquiring an image of the hole while the hole is expanded;
extracting an interest area corresponding to the hole from the acquired image;
linearizing the interest area; and
providing information on a crack as a blob changes due to the linearization, and
determining whether the plate member has been plated,
wherein the extracting of the interest area comprises, when it is determined that the plate member has not been plated, removing a background of the image, and
wherein the hole expansion ratio testing method further comprises, when it is determined that the plate member has been plated, removing the background of the image, before the extracting of the interest area.