Fall detection device and method for controlling thereof
The present invention relates to a fall detection device, which includes a sensor attached to a user and sensing a motion of the fall detection device in a plurality of coordinate axial directions; an output section capable of outputting fall information of a user; and a controller determining that the user falls down when acceleration in a first axial direction among the plurality of coordinate axial directions is changed from a positive value to a negative value based on the motion sensed by the sensor, and controlling the fall information to be output.
1. A fall detection device comprising:
at least one sensor which is attached to a user and senses a motion of the fall detection device in a plurality of coordinate axial directions comprising a first axial direction and a second axial direction perpendicular to the first axial direction;
an output section which outputs fall information of the user; and
a processor which:
determines that the user falls down based on obtaining that acceleration in the first axial direction is changed from a positive value to a negative value, and acceleration in the second axial direction is lower than a first lower limit before impact occurs to the user while the acceleration in the first axial direction is changed from the positive value to the negative value based on the sensed motion of the fall detection device, and
controls the output section to output the fall information that the user falls down.
2. The fall detection device according to claim 1 , wherein the first axial direction is perpendicular to a ground.
3. The fall detection device according to claim 1 , wherein the processor determines that the impact occurs to the user before acceleration of motion components on first axis-second axis-third axis among a plurality of coordinate axes equals to a first upper limit based on the acceleration of motion components on the first axis-second axis-third axis being higher than the first upper limit.
4. The fall detection device according to claim 3 , wherein the processor determines that the user falls down based on obtaining that acceleration of a motion component on a second axis-third axis plane is lower than or equal to a second lower limit after the impact occurs, in the case where the acceleration in the first axial direction is changed from the positive value to the negative value.
5. The fall detection device according to claim 4 , wherein it is determined that the user falls down based on obtaining that time elapsed until the acceleration of the motion component on the second axis-third axis plane reaches the second lower limit after the impact occurs is within a first threshold.
6. The fall detection device according to claim 1 , wherein the output section comprises a communicator for transmitting the fall information to an external device.
7. A method for a fall detection device, comprising:
sensing, by at least one sensor, a motion of the fall detection device in a plurality of coordinate axial directions comprising a first axial direction and a second axial direction perpendicular to the first axial direction while the fall detection device is attached to a user;
determining, by a processor, that the user falls down based on obtaining that acceleration in the first axial direction is changed from a positive value to a negative value, and acceleration in the second axial direction is lower than a first lower limit before impact occurs to the user while the acceleration in the first axial direction is changed from the positive value to the negative value based on the sensed motion of the fall detection device; and
outputting, by an output section, fall information that the user falls down.
8. The method according to claim 7 , wherein the first axial direction is perpendicular to a ground.
9. The method according to claim 7 , wherein the determining that the user falls down comprises determining that the impact occurs to the user before acceleration of motion components on first axis-second axis-third axis among a plurality of coordinate axes equals to a first upper limit based on the acceleration of motion components on the first axis-second axis-third axis being higher than the first upper limit.
10. The method according to claim 9 , wherein the determining that the user falls down comprises determining that the user falls down based on obtaining that acceleration of a motion component on a second axis-third axis plane is lower than or equal to a second lower limit after the impact occurs, in the case where the acceleration in the first axial direction is changed from the positive value to the negative value.
11. The method according to claim 10 , wherein the determining that the user falls down comprises determining that the user falls down based on obtaining that time elapsed until the acceleration of the motion component on the second axis-third axis plane reaches the second lower limit after the impact occurs is within a first threshold.
12. The method according to claim 7 , further comprising transmitting the fall information to an external device.