US 12,442,773 B2
Crack detection device, crack detection method and computer readable medium
Mitsunobu Yoshida, Tokyo (JP); Tadashiro Kondo, Tokyo (JP); and Taichi Ishifuji, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/793,947
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Mar. 4, 2020, PCT No. PCT/JP2020/009246
§ 371(c)(1), (2) Date Jul. 20, 2022,
PCT Pub. No. WO2021/176613, PCT Pub. Date Sep. 10, 2021.
Prior Publication US 2023/0051683 A1, Feb. 16, 2023
Int. Cl. G06K 9/00 (2022.01); G01N 21/88 (2006.01); G06T 7/00 (2017.01)
CPC G01N 21/8851 (2013.01) [G06T 7/0002 (2013.01); G01N 2021/8896 (2013.01); G06T 2207/10016 (2013.01); G06T 2207/20024 (2013.01); G06T 2207/30252 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A crack detection device comprising:
processing circuitry to:
acquire image data acquired by imaging a road surface from an oblique direction with respect to the road surface;
classify the acquired image data into an acceptable range with a resolution higher than a standard value, and an unacceptable range with a resolution equal to or less than the standard value; and
output acceptable data being image data of a part classified into the acceptable range, as data to detect a crack on the road surface,
wherein the image data is acquired by an imaging device that is mounted on a moving object, and
wherein the processing circuitry is configured to set a determination width being a lower limit value of a crack width to be detected in accordance with a shutter speed of the imaging device and a moving speed of the moving object.