Patent ID: 11972573
Assignee: ROKIT HEALTHCARE INC.
Field: Medical technology (Instruments)
Classification: CPC G  A  B | IPC A  B  G

Claim 0:
1. A method of recognizing a wound boundary using three-dimensional (3D) image data of the photographed wound, the method comprising:
(a) storing, by processor, the 3D image data of the photographed wound;
(b) setting, by processor, a point located inside the wound in the image data as a reference point;
(c) calculating, by processor, an average normal of triangles (hereinafter, “3D triangular surfaces”) formed by point clouds included in a preset radius around the reference point, and setting, by processor, a plane including the average normal and a first axis perpendicular to the normal;
(d) calculating, by processor, intersection points between the plane and each of the 3D triangular surfaces, and calculating, by processor, gradients of each of the 3D triangular surfaces using the intersection point;
(e) calculating, by processor, variations of gradients of adjacent 3D triangular surfaces in a direction away from the reference point;
(f) storing, by processor, as a candidate list, a starting point having a length that is maintained at greater than or equal to a reference length value in which a length connecting the 3D triangular surfaces connected to each other among the 3D triangular surfaces related to the variations of the gradients is maintained at a preset reference gradient change value or less among the calculated variations of the gradients;
(g) accumulating, by processor, the candidate list stored in the operation (f) while rotating the plane set in the operation (c) at a preset angle using the average normal as a rotation axis and repeating the operations (d) to (f); and
(h) forming, by processor, a closed curve by connecting adjacent starting points within a preset reference distance among the starting points included in the accumulated candidate list.