US 12,313,394 B2
Deformation calculation device, deformation measurement device, and deformation calculation method
Shigetaka Saji, Tokyo (JP); and Norihiko Hana, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 18/035,930
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Oct. 14, 2021, PCT No. PCT/JP2021/038001
§ 371(c)(1), (2) Date May 9, 2023,
PCT Pub. No. WO2022/172507, PCT Pub. Date Aug. 18, 2022.
Claims priority of application No. 2021-021420 (JP), filed on Feb. 15, 2021.
Prior Publication US 2023/0417540 A1, Dec. 28, 2023
Int. Cl. G01B 11/16 (2006.01)
CPC G01B 11/16 (2013.01) 12 Claims
OG exemplary drawing
 
1. A deformation calculation device comprising:
a deformation calculator which obtains a simply-calculated deformation of a measurement region by digital image correlation with use of
one first image selected from a first image group composed of first images, of the measurement region, that are taken from mutually different relative positions during a first image-taking period and
one second image selected from a second image group composed of second images, of the measurement region, that are taken from mutually different relative positions during a second image-taking period different from the first image-taking period;
a viewpoint change eliminator which obtains a provisional deformation by subtracting, from the simply-calculated deformation, an apparent strain that is back-calculated on an assumption that there is no deformation in the measurement region; and
a uniting circuitry which outputs, as a deformation of the measurement region from the first image-taking period to the second image-taking period, a deformation resulting from averaging the provisional deformations obtained by applying the deformation calculator and the viewpoint change eliminator through sequential selection of different ones of the first images from the first image group and sequential selection of different ones of the second images from the second image group.