Mobile terminal, computer-readable recording medium, and activity recognition device

Patent metadata

Field	Value
Publication number	US-2016334437-A1
Application number	US-201615133423-A
Country	US
Kind code	A1
Filing date	Apr 20, 2016
Priority date	May 13, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

A mobile terminal measures sensor values in a predetermined period. And the mobile terminal detects whether a missing sensor value exists in the predetermined period. And when the mobile terminal is detected the missing sensor value, the mobile terminal interpolates the missing sensor value with a Gaussian process.

First claim

What is claimed is:

1 . A mobile terminal comprising:
a processor that executes a process including: measuring sensor values in a predetermined period; detecting whether a missing sensor value exists in the predetermined period; and interpolating the missing sensor value with a Gaussian process when the missing sensor value exists.

2 . The mobile terminal according to claim 1 , wherein
the interpolating includes selecting a kernel function appropriate to a type of an activity recognized by activity recognition with the sensor values, and interpolating the missing sensor value with the Gaussian process in accordance with the selected kernel function.

3 . The mobile terminal according to claim 1 , wherein the process further comprises:
deriving a distribution function from a measured value measured in advance with the Gaussian process, and calculating a parameter of the measured value with the derived distribution function, wherein the interpolating includes interpolating the missing sensor value with Gaussian distribution in the Gaussian process in accordance with the parameter calculated at the calculating.

4 . The mobile terminal according to claim 3 , wherein
the calculating includes deriving a distribution function from the measured value linked to a user of the mobile terminal, and calculating the parameter with the derived distribution function, and the interpolating includes interpolating the missing sensor value with the Gaussian distribution in accordance with the parameter linked to the user.

5 . The mobile terminal according to claim 3 , wherein
the calculating includes deriving a distribution function appropriate to each activity to be recognized in activity recognition performed with the sensor values from each measured value linked to each of the activities, and calculating each of parameters of each of the measured values linked to each of the activities from the derived distribution function, and the interpolating includes selecting the parameter linked to the activity to be recognized among the each of parameters, and interpolating the missing sensor value with the Gaussian distribution in accordance with the selected parameter.

6 . A computer-readable recording medium having stored therein a program that causes a computer to execute a process comprising:
measuring sensor values in a predetermined period; detecting whether a missing sensor value exists in the predetermined period; and interpolating the missing sensor value with a Gaussian process when the missing sensor value exists.

7 . An activity recognition device comprising:
a processor that executes a process including: obtaining sensor values measured in a predetermined period by a mobile terminal; detecting whether a missing sensor value exists in the predetermined period; interpolating the missing sensor value with a Gaussian process when the missing sensor value exists; and recognizing an activity of a user of the mobile terminal with the sensor values including the interpolated sensor value in the predetermined period.

Assignees

• Fujitsu Ltd

Inventors

• Nishida Masafumi
• Takeda Kazuya
• Kitaoka Norihide
• Hayashi Tomoki
• Adachi Yusuke

Classifications

• H04M2250/12

  including a sensor for measuring a physical value, e.g. temperature or motion · CPC title

• G01P13/00

  Indicating or recording presence, absence, or direction, of movement (electric switches H01H; counting moving objects G06M7/00) · CPC title

• H04M1/0202

  Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets (constructional features of telephone transmitters or receivers, e.g. of speakers or microphones H04M1/03) · CPC title

• G01P15/00 Primary

  Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration · CPC title

• G01P1/127 Primary

  for acceleration values · CPC title