US 12,333,771 B2
Method and apparatus for comparing and determining three-dimensional identity of tool mark
Nam Kyu Park, Bucheon-si (KR); Byung Seon Moon, Busan (KR); Jae Mo Goh, Seoul (KR); Jin Pyo Kim, Daejeon (KR); Young Il Seo, Wonju-si (KR); Eun Ah Joo, Wonju-si (KR); Je Hyun Lee, Wonju-si (KR); and Ho Yong Yie, Wonju-si (KR)
Assigned to REPUBLIC OF KOREA (NATIONAL FORENSIC SERVICE DIRECTOR MINISTRY OF THE INTERIOR AND SAFETY), Wonju-si (KR)
Filed by REPUBLIC OF KOREA (NATIONAL FORENSIC SERVICE DIRECTOR MINISTRY OF THE INTERIOR AND SAFETY), Wonju-si (KR)
Filed on Sep. 7, 2022, as Appl. No. 17/939,151.
Claims priority of application No. 10-2022-0076270 (KR), filed on Jun. 22, 2022.
Prior Publication US 2023/0419634 A1, Dec. 28, 2023
Int. Cl. G06V 10/22 (2022.01); G06V 10/77 (2022.01); G06V 20/64 (2022.01)
CPC G06V 10/225 (2022.01) [G06V 10/7715 (2022.01); G06V 20/647 (2022.01)] 7 Claims
OG exemplary drawing
 
1. A method of comparing and determining three-dimensional (3D) identity of a tool mark, the method comprising:
obtaining a 3D image of a suspect tool and a tool mark;
extracting a contact portion of the suspect tool contributed to formation of the tool mark from the 3D image of the suspect tool;
determining a matching area by comparing a shape of the contact portion of the suspect tool with a shape of the tool mark; and
calculating a matching rate between the contact portion of the suspect tool and the tool mark,
wherein the calculating of the matching rate comprises:
converting the 3D image of the suspect tool and the tool mark into a stereolithography (STL) file format image;
converting the STL file format image into height data of the suspect tool and the tool mark; and
calculating a two-dimensional cross-correlation coefficient of height data of the contact portion of the suspect tool and the tool mark.