Method and apparatus for counting a number of steps taken by walker

• US 7,305,323 B2
• Filed: 01/09/2006
• Issued: 12/04/2007
• Est. Priority Date: 02/04/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Shin, Kun-soo, Choi, Ji-hyun, Hwang, Hyun-tai, Skvortsov, Vladimir
• Primary Examiner(s): Wachsman; Hal
• Application Number:
  US11/327,389
• Publication Number:
  US 20060174685A1
• Time in Patent Office: 694 Days
• Field of Search: 702/160
• US Class Current: 702/160
• CPC Class Codes: G01C 22/006 Pedometers

Abstract

A method and apparatus for counting the steps taken by a walker is provide. The method includes detecting an acceleration value generated by a step taken by a walker at every first stated interval, calculating a standard deviation of detected acceleration values at every second stated interval, determining a walking mode corresponding to the calculated standard deviation among first through N^th walking modes as a walking pattern of the walker, in which N is a positive integer that is larger than 1, checking if there is at least one absolute value that is larger than a threshold acceleration value corresponding to the determined walking mode among the absolute values of the detected acceleration values, and incrementing a count value as a step taken by the walker if there is at least one absolute value that is larger than the threshold acceleration value among the absolute values of the detected acceleration values.

Claims

1. A method for counting the number of steps taken by a walker, the method comprising:

detecting an acceleration value generated by a step taken by the walker at every first stated interval;

calculating a standard deviation at every second stated interval for detected acceleration values;

determining a walking mode corresponding to the calculated standard deviation among first through N^th walking modes as a walking pattern of the walker, in which N is a positive integer that is larger than 1;

checking if there is at least one absolute value that is larger than a threshold acceleration value corresponding to the determined walking mode among the absolute values of the detected acceleration values;

incrementing a count value as a step taken by the walker if there is at least one absolute value that is larger than the threshold acceleration value among the absolute values of the detected acceleration values; and

providing the counted number of steps to the walker after incrementing a count value as a step taken by the walker.

2. The method of claim 1, further comprising:

measuring a time between when at least one largest absolute value among the absolute values that are larger than the threshold acceleration value is detected and when the largest absolute value among the absolute values of acceleration values used for previous step number counting is detected, if there is at least one absolute value that is larger than the threshold acceleration value corresponding to the determined walking mode among the absolute values of the detected acceleration values; and

checking if the measured time exceeds a counting threshold time corresponding to the determined walking mode;

wherein a count value is incremented as a step taken by the walker if the measured time exceeds the counting threshold time.

3. The method of claim 2, wherein the counting threshold time is determined through repetitive experiments.

4. The method of claim 1, wherein the walker is provided with the counted number of steps that is displayed.

5. The method of claim 1, wherein the walker is provided with the counted number of steps that is output through a voice.

6. The method of claim 1, wherein the threshold acceleration value is determined through repetitive experiments.

7. An apparatus for counting the number of steps taken by a walker, the apparatus comprising:

an acceleration detecting unit which detects an acceleration value generated by a step taken by the walker at every first stated interval;

a standard deviation calculating unit which calculates a standard deviation at every second stated interval for detected acceleration values;

a walking mode analyzing unit which determines a walking mode corresponding to the calculated standard deviation among first through N^th walking modes as a walking pattern of the walker, in which N is a positive integer that is larger than 1;

an acceleration value comparing unit which checks if there is at least one absolute value that is larger than a threshold acceleration value corresponding to the determined walking mode among the absolute values of the detected acceleration values;

a step counting unit which increments a count value as a step taken by the walker according to a result of the comparison of the acceleration value comparing unit; and

a step output unit which provides the counted number of steps to the walker after incrementing a count value as a step taken by the walker.

8. The apparatus of claim 7, further comprising:

a time measuring unit which measures a time between when there is at least one largest absolute value among the absolute values that are larger than the threshold acceleration value is detected and when the largest absolute value among the absolute values of acceleration values used for previous step number counting is detected, according to a result of the comparison of the acceleration value comparing unit; and

a time comparing unit which checks if the measured time exceeds a counting threshold time corresponding to the determined walking mode according to a result of the measurement of the time measuring unit;

wherein the step counting unit operates according to the result of the comparison of the acceleration value comparing unit.

9. The apparatus of claim 8, wherein the time comparing unit uses the counting threshold time determined through repetitive experiments to check if the measured time exceeds a counting threshold time corresponding to the determined walking mode.

10. The apparatus of claim 7, wherein the step output unit provides the counted number of steps to the walker by displaying the counted number of steps.

11. The apparatus of claim 10, wherein the step output unit includes a liquid crystal display (LCD) device.

12. The apparatus of claim 7, wherein the step output unit provides the counted number of steps to the walker by outputting the counted number of steps through a voice.

13. The apparatus of claim 7, wherein the acceleration detecting unit detects acceleration values generated by steps taken by the walker using a three-dimensional acceleration sensor.

14. The apparatus of claim 7, wherein the acceleration comparing unit uses the threshold acceleration value determined through repetitive experiments to check if there is at least one absolute value that is larger than the threshold acceleration value among the absolute values of the detected acceleration values.