Information processing apparatus, information processing method, and recording medium

Patent metadata

Field	Value
Publication number	US-9927237-B2
Application number	US-201414911859-A
Country	US
Kind code	B2
Filing date	Jun 25, 2014
Priority date	Aug 22, 2013
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

To be capable of realizing a technique which enables a measurement error of a magnetic sensor to be obtained with higher accuracy, there is provided an information processing apparatus including: a fluctuation measuring unit configured to measure temporal fluctuation of a magnetic value measured by a magnetic sensor during movement of at least the magnetic sensor or information obtained based on the magnetic value, and a measurement error acquiring unit configured to obtain a measurement error of the magnetic sensor based on the fluctuation.

First claim

The invention claimed is:

1. An information processing apparatus comprising:
a fluctuation measuring unit configured to measure temporal fluctuation of a magnetic value measured by a magnetic sensor during movement of at least the magnetic sensor or information obtained based on the magnetic value; and
a measurement error acquiring unit configured to obtain a measurement error of the magnetic sensor based on the fluctuation.

2. The information processing apparatus according to claim 1 , comprising:
a specifying unit configured to specify azimuth or posture based on the measurement error of the magnetic sensor.

3. The information processing apparatus according to claim 2 ,
wherein the specifying unit increases weight of correction to the azimuth or the posture using other sensor data as the measurement error of the magnetic sensor is higher.

4. The information processing apparatus according to claim 3 ,
wherein the specifying unit corrects the azimuth or the posture based on the other sensor data when the measurement error of the magnetic sensor exceeds a threshold.

5. The information processing apparatus according to claim 4 ,
wherein the specifying unit corrects the azimuth or the posture of the magnetic sensor based on angular velocity measured by a gyro sensor when the measurement error of the magnetic sensor exceeds the threshold.

6. The information processing apparatus according to claim 3 ,
wherein the specifying unit specifies the azimuth or the posture based on the measurement error of the magnetic sensor and a measurement error of another sensor.

7. The information processing apparatus according to claim 6 ,
wherein the specifying unit corrects the azimuth or the posture based on sensor data measured by the other sensor when the measurement error of the magnetic sensor exceeds the measurement error of the other sensor.

8. The information processing apparatus according to claim 7 ,
wherein the specifying unit corrects the azimuth or the posture based on angular velocity measured by a gyro sensor when the measurement error of the magnetic sensor exceeds a measurement error of the gyro sensor.

9. The information processing apparatus according to claim 2 , comprising:
a position acquiring unit configured to acquire a measurement position measured by a positioning sensor.

10. The information processing apparatus according to claim 9 ,
wherein the position acquiring unit corrects the measurement position based on position information registered in advance.

11. The information processing apparatus according to claim 9 ,
wherein the position acquiring unit selects area identification information associated with position information which is the same as or close to the measurement position and stores the area identification information as passage history of a user.

12. The information processing apparatus according to claim 1 ,
wherein the fluctuation measuring unit measures the fluctuation while the magnetic sensor is stopped.

13. The information processing apparatus according to claim 2 , comprising:
a display control unit configured to control the azimuth or the posture to be displayed.

14. The information processing apparatus according to claim 13 , comprising:
a display unit configured to display the azimuth or the posture.

15. The information processing apparatus according to claim 1 ,
wherein the fluctuation measuring unit measures, as the fluctuation, a difference value of magnetic values at first measurement time and second measurement time or information obtained based on the magnetic values.

16. The information processing apparatus according to claim 15 ,
wherein the first measurement time and the second measurement time have a predetermined time interval therebetween.

17. The information processing apparatus according to claim 15 ,
wherein among the magnetic values measured within a predetermined time period or the information obtained based on the magnetic values, the first measurement time is a maximum value, and the second measurement time is a minimum value.

18. The information processing apparatus according to claim 15 ,
wherein the measurement error acquiring unit obtains a result of multiplication of the difference value and a fixed coefficient or the difference value as the measurement error of the magnetic sensor.

19. An information processing method comprising:
measuring temporal fluctuation of a magnetic value measured by a magnetic sensor during movement of at least the magnetic sensor or information obtained based on the magnetic value; and
obtaining a measurement error of the magnetic sensor based on the fluctuation.

20. A computer-readable recording medium recording a program thereon, the program causing a computer to function as an information processing apparatus including
a fluctuation measuring unit configured to measure temporal fluctuation of a magnetic value measured by a magnetic sensor during movement of at least the magnetic sensor or information obtained based on the magnetic value, and
a measurement error acquiring unit configured to obtain a measurement error of the magnetic sensor based on the fluctuation.

Assignees

• Sony Corp

Inventors

• Kimishima Masato

Classifications

• G01C21/26

  specially adapted for navigation in a road network · CPC title

• G01C17/02

  Magnetic compasses · CPC title

• G01C21/30

  Map- or contour-matching · CPC title

• G01C17/38 Primary

  Testing, calibrating, or compensating of compasses · CPC title

• G01C17/28

  Electromagnetic compasses (with north seeking magnetic elements and having electric pick-offs G01C17/26) · CPC title