US 11,682,179 B2
Measuring method
Yu-Tai Li, Taichung (TW); Kao-Chi Lin, Kaohsiung (TW); Cho-Fan Hsieh, Yilan County (TW); Teng-Chun Wu, Kinmen County (TW); and Cheng-Yu Peng, Taoyuan (TW)
Assigned to Industrial Technology Research Institute, Hsinchu (TW)
Filed by Industrial Technology Research Institute, Hsinchu (TW)
Filed on Dec. 6, 2021, as Appl. No. 17/542,504.
Claims priority of application No. 110138960 (TW), filed on Oct. 20, 2021.
Prior Publication US 2023/0119864 A1, Apr. 20, 2023
Int. Cl. G06T 19/00 (2011.01); G06T 3/40 (2006.01)
CPC G06T 19/006 (2013.01) [G06T 3/4038 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A measuring method, comprising:
forming an image to be tested of an object to be tested with a first characteristic pattern;
copying the image to be tested to form a plurality of images to be tested, and superimposing the plurality of images to be tested to form a to-be-tested overlapped image, wherein the to-be-tested overlapped image has a plurality of the first characteristic patterns;
forming a reference image of a reference object with a second characteristic pattern;
copying the reference image to form a plurality of reference images, and superimposing the plurality of reference images to form a reference overlapped image, wherein the reference overlapped image has a plurality of the second characteristic patterns;
superimposing the to-be-tested overlapped image and the reference overlapped image to generate a virtual moiré image, wherein the virtual moiré image has a moiré pattern, the moiré pattern is different from the plurality of the first characteristic patterns, and the moiré pattern is different from the plurality of the second characteristic patterns.