US 12,444,043 B2
Non-contact detection device and detection method thereof
Wei-Shiang Huang, Tainan (TW); Tsai-Ling Kao, Tainan (TW); Chun-Yi Lee, Chiayi (TW); and Jhe-Ruei Li, Tainan (TW)
Assigned to INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Hsinchu (TW)
Filed by INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Hsinchu (TW)
Filed on Jan. 6, 2023, as Appl. No. 18/093,917.
Claims priority of application No. 111142796 (TW), filed on Nov. 9, 2022.
Prior Publication US 2024/0153068 A1, May 9, 2024
Int. Cl. G01B 11/26 (2006.01); G06T 7/00 (2017.01)
CPC G06T 7/001 (2013.01) [G06T 2207/30164 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A non-contact detection method for a nut, comprising:
photographing the nut to obtain a threaded hole image of the nut;
performing a thread area comparison between the threaded hole image and a standard threaded hole image;
calculating an area difference based on a comparison result of the thread area comparison; and
analyzing the area difference based on a correlation between an inclination of a thread cutting path and an alignment of a threaded hole axis, to determine whether a structural deviation exists in a geometry of the thread.