Granted Patent B2

US 12,322,132 · App. 18/524,990 · Granted Jun 3, 2025

Inventors: Yinhang Tu (Ningde, CN); Yifei Gao (Ningde, CN)

Assignee: CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

G06T7/73G06T3/06G06T7/0004G06T7/60G06T2207/10028

Abstract

Claims (50)

1. A machine vision detection method, comprising:

receiving a three-dimensional image from a line laser, the three-dimensional image comprising: at least a portion of a boundary of a first component, at least a portion of a boundary of a second component, and a welding spot located on the boundary of the first component or the boundary of the second component;

converting the three-dimensional image into a two-dimensional grayscale image;

obtaining the boundary of the first component and the boundary of the second component in the two-dimensional grayscale image;

generating N perpendicular lines between the boundary of the first component and the boundary of the second component, where N is a positive integer between 20 and 50; and

calculating an average length of the N perpendicular lines as a gap between the first component and the second component;

wherein obtaining the boundary of the first component and the boundary of the second component in the two-dimensional grayscale image comprises:

arranging, in a boundary area including the boundary of the first component, N first fitting units equally dividing the boundary area;

sequentially connecting intersection points each between one of the first fitting units and the boundary of the first component to form a first straight line fitted to the boundary of the first component;

arranging, in a boundary area including the boundary of the second component, N second fitting units equally dividing the boundary area; and

sequentially connecting intersection points each between one of the second fitting units and the boundary of the second component to form a second straight line fitted to the boundary of the second component.

2. The method according to claim 1 , wherein generating the N perpendicular lines between the boundary of the first component and the boundary of the second component comprises:

determining intersection points between the N first fitting units and the boundary of the first component as first set points, and generating the N perpendicular lines perpendicular to the second straight line by taking the first set points as starting points, respectively; or

determining intersection points between the N second fitting units and the boundary of the second component as second set points, and generating the N perpendicular lines perpendicular to the first straight line by taking the second set points as starting points, respectively.

3. The method according to claim 1 , further comprising:

extracting a third straight line and a fourth straight line respectively fitted to two side boundaries of the welding spot in the two-dimensional grayscale image;

determining a first tangent point where the third straight line is tangent to the welding and the second side boundary of the welding spot as the second tangent point.

4. The method according to claim 3 , wherein extracting the third straight line and the fourth straight line respectively fitted to the two side boundaries of the welding spot in the two-dimensional grayscale image comprises:

arranging, in a boundary area including the first side boundary of the welding spot, M third fitting units equally dividing the boundary area, where M is a positive integer between 30 and 50;

sequentially connecting intersection points each between one of the third fitting units and the first side boundary of the welding spot to form the third straight line;

arranging, in a boundary area including the second side boundary of the welding spot, M fourth fitting units equally dividing the boundary area respectively;

sequentially connecting intersection points each between one of the fourth fitting units and the second side boundary of the welding spot to form the fourth straight line.

5. The method according to claim 4 , wherein determining the first tangent point where the third straight line is tangent to the welding spot and the second tangent point where the fourth straight line is tangent to the welding spot comprises:

taking the intersection point between the last third fitting unit on the third straight line and the first side boundary of the welding spot as the first tangent point; and

taking the intersection point between the last fourth fitting unit on the fourth straight line

arranging, in a boundary area including the boundary of the first component, N first fitting units equally dividing the boundary area;

sequentially connecting intersection points each between one of the first fitting units and the boundary of the first component to form a first straight line fitted to the boundary of the first component;

arranging, in a boundary area including the boundary of the second component, N second fitting units equally dividing the boundary area; and

sequentially connecting intersection points each between one of the second fitting units and the boundary of the second component to form a second straight line fitted to the boundary of the second component;

generating N perpendicular lines between the boundary of the first component and the boundary of the second component, where N is a positive integer between 20 and 50; and

calculating an average length of the N perpendicular lines as a gap between the first component and the second component.

6. The method according to claim 4 , wherein determining the first tangent point where the third straight line is tangent to the welding spot and the second tangent point where the fourth straight line is tangent to the welding spot comprises:

taking an intersection point between the third straight line and the first straight line as the first tangent point; and

taking an intersection point between the fourth straight line and the first straight line as the second tangent point.

7. A non-volatile computer storage medium, storing computer program instructions that, when executed by a processor, cause the processor to perform the method according to claim 1 .

8. An electronic device, comprising:

a processor; and

a memory communicatively connected with the processor and storing computer program instructions that, when executed by the processor, cause the processor to perform a machine vision detection method comprising:

receiving a three-dimensional image from a line laser, the three-dimensional image comprising: at least a portion of a boundary of a first component, at least a portion of a boundary of a second component, and a welding spot located on the boundary of the first component or the boundary of the second component;

converting the three-dimensional image into a two-dimensional grayscale image;

obtaining the boundary of the first component and the boundary of the second component in the two-dimensional grayscale image, comprising:

spot and a second tangent point where the fourth straight line is tangent to the welding spot; and

calculating a distance between the first tangent point and the second tangent point as a width of the welding spot.

9. A machine vision detection apparatus, comprising:

a receiving module configured to receive a three-dimensional image from a line laser, the three-dimensional image comprising: at least a portion of a boundary of a first component, at least a portion of a boundary of a second component, and a welding spot located on the boundary of the first component or the boundary of the second component;

a conversion module configured to convert the three-dimensional image into a two-dimensional grayscale image;

a fitting module configured to obtain the boundary of the first component and the boundary of the second component in the two-dimensional grayscale image, comprising:

arranging, in a boundary area including the boundary of the first component, N first fitting units equally dividing the boundary area, where N is a positive integer between 20 and 50; and

arranging, in a boundary area including the boundary of the second component, N second fitting units equally dividing the boundary area; and

a gap calculation module configured to determine N perpendicular lines between the boundary of the first component and the boundary of the second component and calculate an average length of the N perpendicular lines as a gap between the first component and the second component.

Assignments (2)

Continuity (2)

References Cited (13)