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

Claim 7:
8. A hole expansion ratio testing device comprising:
a chucking unit configured to hold a plate member having a hole;
a punching unit inserted into the hole and configured to expand the hole;
an image acquisition unit configured to acquire an image of the hole expanded by the punching unit; and
an analysis unit configured to extract an interest area corresponding to the hole from the acquired image, linearize the interest area, and provide information on a crack as a blob changes due to the linearization,
wherein the analysis unit varies a sequence, in which backgrounds are removed from the acquired image, according to whether the plate member is plated,
wherein when the plate member is plated, the analysis unit removes a background defined as an area reflected due to the plating, and extracts the interest area from the image, from which the background has been removed.