Method and system for detecting relative motion using one or more motion sensors

• US 20070103550A1
• Filed: 11/09/2005
• Published: 05/10/2007
• Est. Priority Date: 11/09/2005
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Frank, Michael, Dolfi, David, Rosenau, Steven
• Application Number:
  US11/270,345
• Publication Number:
  US 20070103550A1
• Time in Patent Office: Days
• US Class Current: 348/154
• CPC Class Codes: G01S 17/50 Systems of measurement based on relative movement of target
• CPC Class Codes: G01S 17/87 Combinations of systems using electromagnetic waves other than radio waves
• CPC Class Codes: G06F 3/0317 in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface

Abstract

One or more optical motion sensors are connected to a central processing device. At least one of the motion sensors captures representations of a region, such as images or patterns that represent the region. Each optical motion sensor processes its representations to generate resulting data that are used to detect whether an object moved in relation to a respective motion sensor. Any relative motion may be detected by each optical motion sensor or by the central processing device using resulting data received from the optical motion sensor or sensors.

Claims

1. A motion sensor for use in detecting relative motion in a region, the motion sensor comprising:

an imaging device having a field of view that includes at least a portion of the region, wherein the imaging device captures representations of the field of view;

an analyzing system coupled to the imaging device for processing the representations in order to detect relative motion in the field of view; and

a wireless transmitter coupled to the analyzing system for transmitting data associated with the processed representations.

2. The motion sensor of claim 1, further comprising a memory coupled to the imaging device.

3. The motion sensor of claim 1, further comprising a light source for emitting light towards the region.

4. The motion sensor of claim 1, wherein the wireless transmitter comprises a low power transmitter with a bulk acoustic wave resonator.

5. The motion sensor of claim 1, wherein the representations comprise one of images and patterns.

6. A motion detection network for detecting relative motion in one or more regions, comprising:

a central processing device; and

one or more motion sensors each coupled to the central processing device using a wireless connection, wherein at least one of the one or more motion sensors captures representations of a respective region for detecting relative motion.

7. The motion detection network of claim 6, wherein each motion sensor comprises:

an imaging device for capturing representations of a respective region;

an analyzing system coupled to the imaging device for processing the representations in order to detect relative motion; and

a wireless transmitter coupled to the analyzing system and the wireless connection.

8. The motion detection network of claim 7, wherein each motion sensor further comprises a memory coupled to the imaging device.

9. The motion detection network of claim 7, wherein each motion sensor further comprises a light source for emitting light towards the respective region.

10. The motion detection network of claim 7, wherein the wireless transmitter comprises a bulk acoustic wave resonator.

11. The motion detection network of claim 7, wherein the representations comprise one of images and patterns.

12. A method for detecting relative motion in one or more regions using at least one motion sensor coupled to a central processing device over a wireless connection, the method comprising:

capturing representations of the one or more regions;

generating resulting data by processing the representations in order to detect relative motion; and

transmitting the resulting data to the central processing device.

13. The method of claim 12, further comprising detecting relative motion in the one or more regions using the resulting data.

14. The method of claim 12, further comprising programming the central processing device with one or more detection parameters.

15. The method of claim 12, wherein the representations comprise one of images and patterns.

16. The method of claim 15, further comprising programming the central processing device to perform a motion detection technique.

17. The method of claim 16, wherein the motion detection technique comprises one of image correlation, speckle translation, light and shadow pattern correlation, and laser interferometry.

18. The method of claim 13, further comprising taking an action based on the presence or absence of any relative motion in the one or more regions.

19. The method of claim 12, wherein capturing representations of the one or more regions comprises capturing representations of the one or more regions using reflected light.

20. The method of claim 12, wherein capturing representations of the one or more regions comprises capturing representations of the one or more regions using ambient light.