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US 11,913,912 B2Granted
Hole expansion ratio testing device, hole expansion ratio testing method, and operating program
AssigneeIndustry-University Cooperation Foundation Hanyang University Erica Campus
InventorsJonghun Yoon, Seungho Choi
Life of this patent
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Abstract
Disclosed are a hole expansion ratio testing device, a hole expansion ratio testing method, and an operation program. The hole expansion ratio testing device includes a chucking unit configured to chuck 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.
Claims13
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.
4 more elements
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.
4 more elements
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.
7 more elements
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,
- wherein the extracting of the interest area comprises:
- when the plate member has not been plated,
- selecting a specific pixel from the binarized image, and detecting blobs by grouping adjacent pixels having the same gray scale as the specific pixel;
- and
- removing the largest blob from the detected blobs, and providing, among the blobs left after the removal, a blob that is most distant from the center of the image as the interest area, and
- when the plate member has been plated,
- selecting a specific pixel from the binarized image, and detecting blobs by grouping adjacent pixels having the same gray scale as the specific pixel;
- and
- providing a blob that is most distance from the center of the image as the interest area.
13 more elements
A hole expansion ratio testing program stored in a medium to execute operations of:
- 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;
- 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.
8 more elements
Dependencies are inferred from the claim text.