Portable terminal having motion-recognition capability and motion recognition method therefor

• US 20060255139A1
• Filed: 01/05/2006
• Published: 11/16/2006
• Est. Priority Date: 05/12/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Dong-Yoon, Bang, Won-Chul, Choi, Eun-Seok, Lee, Ki-Tae, Cho, Sung-Jung
• Granted Patent: US 7,735,025 B2
• Time in Patent Office: Days
• US Class Current: 235/439
• CPC Class Codes: G06F 3/011 Arrangements for interaction with the human body, e.g. for user immersion in virtual reality blind teaching G09B21/00

Abstract

A motion-recognition portable terminal and a motion recognition method therefor are provided. In the portable terminal, a motion key starts to create a motion entry, upon activation. A motion detector measures an acceleration along each axis of the portable terminal, upon activation of the motion key. A controller determines whether the motion entry has been completed based on the variation of the each-axis acceleration.

Claims

1. A portable terminal comprising:

a motion key for starting to create a motion entry, upon activation;

a motion detector for measuring an acceleration along each axis of the portable terminal, upon activation of the motion key; and

a controller for determining whether the motion entry has been completed based on a variation of the acceleration along each axis.

2. The portable terminal of claim 1, wherein the controller determines that the motion entry has been completed if a halt period lasts for a predetermined time after a motion period, the halt period being a time period in which the variation of the each-axis acceleration is less than a predetermined threshold, and the motion period being a time period in which the variation of the acceleration along each axis is greater than the threshold.

3. The portable terminal of claim 2, wherein the threshold is the average of acceleration variations measured for an initial predetermined time period.

4. The portable terminal of claim 2, wherein the threshold is the maximum of the acceleration variations measured for the initial predetermined time period.

5. The portable terminal of claim 2, wherein before the variation of the acceleration along each axis is calculated, signal flattening is performed on the acceleration along each axis by

$A_i^{\prime }$

⁡

( t ) = ∑

j = 0 M ⁢

w j ·

A i ⁡

( t - j )

where A′

_i(t) denotes the sum of weighted accelerations, w_j denotes a weight, M denotes a number of measuring an acceleration for the predetermined time interval, i denotes X, Y or Z axis, and A_i(t) denotes an each axis acceleration at time t.

6. The portable terminal of claim 2, wherein the variation of the acceleration along each axis is calculated by

D_i(t)=max_p=1−

M<sup>l−

1</sup>|A_i(t)−

A_i(p)|
D(t)=∞

{square root over (D_x²(t)+D_y²(t)+D_z²(t))} 

 

(2)

where D(t) denotes the variation of the acceleration along each axis at time t, i denotes X, Y or Z axis, A_i(t) denotes an each axis acceleration at time t, and M denotes a number of measuring an acceleration for the predetermined time interval.

7. The portable terminal of claim 2, wherein the motion period is longer than a predetermined motion recognition time period and the halt period is longer than a predetermined halt recognition time period.

8. A method of detecting motion entry completion in a portable terminal, comprising the steps of:

activating a motion key;

creating a motion entry upon activation of the motion key;

measuring an acceleration along each axis of the portable terminal; and

determining whether the motion entry has been completed based on a variation of the acceleration along each axis.

9. The method of claim 8, wherein the determining step comprises determining that the motion entry has been completed if a halt period lasts for a predetermined time after a motion period, the halt period being a time period in which the variation of the acceleration along each axis is less than a predetermined threshold, and the motion period being a time period in which the variation of the acceleration along each axis is larger than the threshold.

10. The method of claim 9, wherein the threshold is the average of acceleration variations measured for an initial predetermined time period.

11. The method claim 9, wherein the threshold is the maximum of the acceleration variations measured for the initial predetermined time period.

12. The method of claim 9, wherein the determining step comprises, before the variation of the acceleration along each axis is calculated, performing signal flattening on the acceleration along each axis by

$A_i^{\prime }$

⁡

( t ) = ∑

j = 0 M ⁢

w j ·

A i ⁡

( t - j )

where A′

_i(t) denotes the sum of weighted accelerations, w_j denotes a weight, M denotes a number of measuring an acceleration for the predetermined time interval, i denotes X, Y or Z axis, and A_i(t) denotes an each axis acceleration at time t.

13. The method of claim 9, wherein the determining step comprises calculating the variation of the acceleration along each axis by

D_i(t)=max_p=1−

M<sup>l−

1</sup>|A_i(t)−

A_i(p)|
D(t)=∞

{square root over (D_x²(t)+D_y²(t)+D_z²(t))} 

 

(2)

where D(t) denotes the variation of the acceleration along each axis at time t, i denotes X Y or Z axis, A_i(t) denotes an each axis acceleration at time t, and M denotes a number of measuring an acceleration for the predetermined time interval.

14. The method of claim 9, wherein the motion period is longer than a predetermined motion recognition time period and the halt period is longer than a predetermined halt recognition time period.