INTERPRETING ANGULAR ORIENTATION DATA

• US 20120053890A1
• Filed: 01/14/2010
• Published: 03/01/2012
• Est. Priority Date: 01/22/2009
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Van Acht, Victor Martinus Gerardus, Bongers, Edwin Gerardus Johannus Maria, Lambert, Nicolaas
• Granted Patent: US 8,818,751 B2
• Time in Patent Office: Days
• US Class Current: 702/151
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• CPC Class Codes: A61B 5/1038 Measuring plantar pressure during gait
• CPC Class Codes: A61B 5/1071 measuring angles, e.g. using goniometers A61B5/1123 takes precedence

Abstract

The invention relates to method and a system of interpreting angular orientation data. It is determined, whether the angular deviation of a current angular orientation (C) of a sensor device (12) from a last extreme angular orientation (L) currently decreases after having increased before up to a provisional new extreme angular orientation (P), thereby determining that the provisional new extreme angular orientation (P) is a new extreme angular orientation. Information relating to a new extreme angular orientation, such as an angular range of motion, may be output to a user.

Claims

1. A method of interpreting angular orientation data, comprising the steps of:

receiving angular orientation data from a sensor device (12), said angular orientation data comprising information about a current angular orientation (C) in space of the sensor device (12) relative to a reference orientation; and

determining whether the angular deviation of the current angular orientation (C) from a last extreme angular orientation (L) currently decreases after having increased before up to a provisional new extreme angular orientation (P), thereby determining that the provisional new extreme angular orientation (P) is a new extreme angular orientation;

2. The method as claimed in claim 1, wherein said sensor device (12) is, in any angular orientation, sensitive for rotation about each of a vertical axis and two further axes.

3. The method as claimed in claim 1, wherein the angular deviation is a deviation in three-dimensional rotational space.

4. The method as claimed in claim 1, further comprising the step of:

determining an angular range of motion as an angular difference between the new extreme angular orientation and the last extreme angular orientation.

5. The method as claimed in claim 1, the method further comprising the step of:

outputting information relating to the new extreme angular orientation to a user.

6. The method as claimed in claim 1, wherein in the determining step, a current angular orientation (C), which corresponds to a currently decreasing deviation of the current angular orientation (C) from the last extreme angular orientation (L), is only taken into account if the angular difference between the current angular orientation (C) and the provisional new extreme angular orientation (P) exceeds a threshold value.

7. The method as claimed in claim 1, wherein the determining step comprises the steps of:

determining whether an angular deviation between the current orientation (C) and the last extreme orientation (L) is larger than an angular deviation between the provisional new extreme orientation (P) and the last extreme orientation (L), and, if so, setting the provisional new extreme orientation (P) to the value of the current orientation (C);

determining whether an angular deviation between the current orientation (C) and the provisional new extreme orientation (P) exceeds a threshold value, and, if so, setting the last extreme orientation (L) to the value of the provisional new extreme orientation (P) and setting the provisional new extreme orientation (P) to the value of the current orientation (C).

12. Computer program or Computer program product for performing the method as claimed in claim 1 when executed on a computer.

13. Data Carrier including a Computer program for performing the steps of the method as claimed in claim 1.

14. Computer for executing a computer program as claimed in claim 12.

8. A system for interpreting angular orientation data of a body part, the system comprising:

a sensor device (12) for being attached to the body part; and

an interpreter device (18), the interpreter device being arranged for;

receiving angular orientation data from the sensor device (12), said angular orientation data comprising information about a current angular orientation (C) in space of the sensor device (12) relative to a reference orientation; and

determining whether the angular deviation of the current angular orientation (C) from a last extreme angular orientation (L) currently decreases after having increased before up to a provisional new extreme angular orientation (P), thereby determining that the provisional new extreme angular orientation (P) is a new extreme angular orientation.

9. The system as claimed in claim 8, the system further comprising:

an output device (20) for outputting to a user information relating to a new extreme angular orientation.

10. The system as claimed in claim 8, wherein the interpreter device (18) is adapted for receiving angular orientation data from the sensor device (12), said angular orientation data comprising information about a current angular orientation (C) in space of the sensor device (12) relative to a reference orientation;

and

determining whether the angular deviation of the current angular orientation (C) from a last extreme angular orientation (L) currently decreases after having increased before up to a provisional new extreme angular orientation (P), thereby determining that the provisional new extreme angular orientation (P) is a new extreme angular orientation.

11. The system as claimed in claim 8, wherein said sensor device (12) is, in any angular orientation, sensitive for rotation about each of a vertical axis and two further axes.