Movement detection device, electronic device, movement detection method and storage medium stored with a program

• US 8,589,113 B2
• Filed: 08/23/2010
• Issued: 11/19/2013
• Est. Priority Date: 08/28/2009
• Status: Active Grant

• Current Assignee: LAPIS Semiconductor Co., Ltd. (ROHM Co., Ltd.)
• Original Assignee: Oki Semiconductor Company Limited (ROHM Co., Ltd.)
• Inventors: Fujiwara, Kazunori
• Primary Examiner(s): Bui, Bryan
• Application Number:
  US12/861,274
• Publication Number:
  US 20110054831A1
• Time in Patent Office: 1,184 Days
• Field of Search: 702/141, 702/153, 734/88, 734/86
• US Class Current: 702/141
• CPC Class Codes: G06F 3/017 Gesture based interaction, e.g. based on a set of recognized hand gestures interaction based on gestures traced on a digitiser G06F3/04883
• CPC Class Codes: G06F 3/0346 with detection of the device orientation or free movement in a 3D space, e.g. 3D mice, 6-DOF [six degrees of freedom] pointers using gyroscopes, accelerometers or tilt-sensors
• CPC Class Codes: G06F 3/0487 using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser

Abstract

A movement detection device that includes an acceleration detection unit, a splitting unit and a movement detection unit is provided. The acceleration detection unit detects each respective acceleration component of acting acceleration for each axis of a three-dimensional orthogonal coordinate system and outputs respective acceleration component data. The splitting unit splits the respective acceleration component data output from the acceleration detection unit into a stationary component obtained by low-pass filter processing and a movement component that is the respective acceleration component data from which the respective stationary component has been removed. The movement detection unit detects which axial direction the acceleration detection unit has moved in for each of the axes based on a movement component indicating the maximum value split by the splitting unit.

Claims

1. A movement detection device comprising:

an acceleration detection unit configured to detect each respective acceleration component of acting acceleration for each axis of a three-dimensional orthogonal coordinate system and outputs respective acceleration component data;

a splitting unit configured to split the respective acceleration component data output from the acceleration detection unit into a stationary component obtained by low-pass filter processing and a movement component that is the respective acceleration component data from which the respective stationary component has been removed; and

a movement detection unit configured to detect which axial direction the acceleration detection unit has moved in for each of the axes based on the movement component indicating a maximum value split by the splitting unit.

2. The movement detection device of claim 1, wherein the movement detection unit is further configured to detect the acceleration detection unit as having moved in the axial direction corresponding to the movement component indicating the maximum value when the movement detection unit is moved to-and-fro along one of the axial directions if, when the movement component indicating the maximum value first exceeded a predetermined first threshold value, a time period from when the movement component exceeds a predetermined second threshold value until it next exceeds the second threshold value is within a range of a predetermined specific time period, or if, when the movement component indicating the maximum value first exceeded the predetermined second threshold value, a time period from when the movement component exceeds the first threshold value until it next exceeds the first threshold value is within the range of the predetermined specific time period.

3. A movement detection device comprising:

an acceleration detection unit configured to detect each respective acceleration component of acting acceleration in each axis of a three-dimensional orthogonal coordinate system and outputs respective acceleration component data;

a splitting unit configured to split the respective acceleration component data output from the acceleration detection unit into a stationary component obtained by low-pass filter processing and a movement component that is the respective acceleration component data from which the respective stationary component has been removed; and

a gravitational axis determination unit configured to determine which one of the axes is the gravitational axis corresponding to the direction of gravity, based on the stationary component when the acceleration detection unit has been moved in the direction of gravity with one of the axes facing the direction of gravity;

wherein the gravitational axis determination unit is further configured to detect that the acceleration detection unit has moved in the direction of gravity and the opposite direction to the direction of gravity when the movement component in the gravitational axis has exceeded a predetermined positive direction first threshold value and a predetermined negative direction second threshold value at least once each alternately within a specific time period.

4. A movement detection method comprising:

detecting with an acceleration detection unit each respective acceleration component of acceleration acting on the acceleration detection unit for each axis of a three-dimensional orthogonal coordinate system and outputting respective acceleration component data;

splitting the respective acceleration component data output from the acceleration detection unit into a stationary component obtained by low-pass filter processing and a movement component that is the respective acceleration component data from which the respective stationary component has been removed; and

detecting which axial direction the acceleration detection unit has moved in for each of the axes based on the movement component indicating a maximum split value, or determining which one of the axes is the gravitational axis corresponding to the direction of gravity, based on the stationary component when the acceleration detection unit has been moved in the direction of gravity with one of the axes facing the direction of gravity.

5. The movement detection method of claim 4, wherein when detecting which axial direction the acceleration detection unit has moved in from each of the axes,

the acceleration detection unit is detected as having moved in the axial direction corresponding to the movement component indicating the maximum value when the movement detection unit is moved to-and-fro along one of the axial directions if, when the movement component indicating the maximum value first exceeded a predetermined first threshold value, a time period from when the movement component exceeds a predetermined second threshold value until it next exceeds the second threshold value is within a range of a predetermined specific time period, or if, when the movement component indicating the maximum value first exceeded the predetermined second threshold value, a time period from when the movement component exceeds the first threshold value until it next exceeds the first threshold value is within the range of the predetermined specific time period.

6. The movement detection method of claim 4, wherein when determining which axis is the gravitational axis corresponding to the direction of gravity,

the acceleration detection unit is detected as having moved in the direction of gravity and the opposite direction to the direction of gravity when the movement component in the gravitational axis has exceeded a predetermined positive direction first threshold value and a predetermined negative direction second threshold value at least once each alternately within a specific time period.