Walk discrimination device, walk discrimination method, and program recording medium

A walk discrimination method comprising:

• receiving sensor data including an acceleration and an angular velocity acquired by a sensor installed in a shoe of a user;
• calculating 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, starting 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, determining that the user is walking;
• when the determination order is not satisfied, determining that the user is not walking;
• outputting a first acceleration signal in response to the acceleration included in the sensor data is positive, and outputting a second acceleration signal in response to the acceleration included in the sensor data is negative, outputting an over-threshold signal in response to the attitude angle exceeding the threshold, outputting a first attitude angle signal in response to a detection of a negative peak of the attitude angle, outputting a second attitude angle signal in response to a detection of a positive peak of the attitude angle,
• determining 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
• outputting information including a discrimination result indicating whether the user is walking or not.

A non-transient program recording medium recording a program for causing a computer to execute:

• processing of receiving sensor data including an acceleration and an angular velocity acquired by a sensor installed in a shoe of a user;
• processing of calculating 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, processing of starting 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, processing of determining that the user is walking;
• when the determination order is not satisfied, processing of determining that the user is not walking;
• processing of outputting a first acceleration signal in response to the acceleration included in the sensor data is positive, and processing of outputting a second acceleration signal in response to the acceleration included in the sensor data is negative, processing of outputting an over-threshold signal in response to the attitude angle exceeding the threshold, processing of outputting a first attitude angle signal in response to a detection of a negative peak of the attitude angle, processing of outputting a second attitude angle signal in response to a detection of a positive peak of the attitude angle,
• processing of determining 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
• processing of outputting information including a discrimination result indicating whether the user is walking or not.