US 12,270,909 B2
Detection method and detection system
Yutaro Iijima, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on May 27, 2022, as Appl. No. 17/827,057.
Claims priority of application No. 2021-091205 (JP), filed on May 31, 2021.
Prior Publication US 2022/0390609 A1, Dec. 8, 2022
Int. Cl. G01S 17/89 (2020.01); G01S 17/42 (2006.01); G01S 17/86 (2020.01)
CPC G01S 17/89 (2013.01) [G01S 17/42 (2013.01); G01S 17/86 (2020.01)] 8 Claims
OG exemplary drawing
 
1. A detection method comprising:
measuring a first area with an infrared distance measuring sensor;
acquiring measured values of the first area;
acquiring three-dimensional coordinate values of at least two points in a second area included in the first area, the second area is smaller than the first area, based on the measured values;
calculating a position of a plane including the second area, based on the three-dimensional coordinate values of the at least two points;
deciding the position of the plane as a three-dimensional shape of the first area;
determining whether a ratio of a size of the second area to a size of the first area is equal to or lower than a threshold; and
notifying a user of a possibility that a detection accuracy for the three-dimensional shape of the first area is low, when the ratio is equal to or lower than the threshold.