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

Claim 0:
1. 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; and
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 extracts the interest area by dividing the image of the acquired hole into a plurality of unit cells, and binarizes the plurality of unit cells by applying independent threshold values for the unit cells.