US 12,123,742 B2
Walk discrimination device, walk discrimination method, and program recording medium
Noriyuki Tonouchi, Tokyo (JP); Kazuki Ihara, Tokyo (JP); Chenhui Huang, Tokyo (JP); and Kenichiro Fukushi, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 17/436,210
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Mar. 27, 2019, PCT No. PCT/JP2019/013347
§ 371(c)(1), (2) Date Sep. 3, 2021,
PCT Pub. No. WO2020/194598, PCT Pub. Date Oct. 1, 2020.
Prior Publication US 2022/0146280 A1, May 12, 2022
Int. Cl. A61B 5/11 (2006.01); G01C 23/00 (2006.01); G01D 1/12 (2006.01); G01D 1/16 (2006.01); G01D 1/18 (2006.01)
CPC G01C 23/00 (2013.01) [A61B 5/1123 (2013.01); G01D 1/12 (2013.01); G01D 1/16 (2013.01); G01D 1/18 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A walk discrimination device comprising:
at least one memory storing instructions; and
at least one processor connected to the at least one memory and configured to execute the instructions to:
receive sensor data including an acceleration and an angular velocity acquired by a sensor installed in a shoe of a user;
calculate an attitude angle by use of the acceleration and the angular velocity included in the sensor data;
in response to the attitude angle exceeding a threshold, start a walk determination process based on a determination order that detecting a negative peak in the attitude angle, changing the acceleration to positive, changing the acceleration to negative, and detecting a positive peak in the attitude angle in this order;
when the determination order is satisfied, determine that the user is walking;
when the determination order is not satisfied, determine that the user is not walking;
output a first acceleration signal in response to the acceleration included in the sensor data is positive, and output a second acceleration signal in response to the acceleration included in the sensor data is negative, output an over-threshold signal in response to the attitude angle exceeding the threshold, output a first attitude angle signal in response to a detection of a negative peak of the attitude angle, output a second attitude angle signal in response to a detection of a positive peak of the attitude angle, and
determine that a walk has been performed in response to a sequential receipt of the first attitude angle signal, the first acceleration signal, the second acceleration signal, and the second attitude angle signal after receiving the over-threshold signal and the second attitude angle signal after receiving the over-threshold signal; and
output information including a discrimination result indicating whether the user is walking or not.