Positioning Device of Pointer and Related Method

• US 20090153479A1
• Filed: 10/01/2008
• Published: 06/18/2009
• Est. Priority Date: 12/17/2007
• Status: Abandoned Application

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: PixArt Imaging Incorporated
• Inventors: Chao, Tzu-Yi, Lin, Chih-Hsin, Gu, Ren-Hau
• Application Number:
  US12/242,948
• Publication Number:
  US 20090153479A1
• Time in Patent Office: Days
• US Class Current: 345/158
• CPC Class Codes: G06F 3/0304 Detection arrangements using opto-electronic means constructional details of pointing devices not related to the detection arrangement using opto-electronic means G06F3/033; optical digitisers G06F3/042
• CPC Class Codes: G06F 3/03542 Light pens for emitting or receiving light
• CPC Class Codes: G06F 3/0386 for light pen
• CPC Class Codes: G06F 3/0481 based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance

Abstract

A positioning device for positioning an aim point of a pointer on a screen includes a screen, a pointer and a processor. The screen is utilized for displaying a plurality of characteristic points having already-known coordinate values. The pointer is utilized for forming an aim point, and includes an image acquisition unit for acquiring an image and a calculation unit for calculating image coordinate values of the plurality of characteristic points in the image. The processor is coupled to the screen and the pointer, and is utilized for establishing a transformation matrix according to the already-known coordinate values of the plurality of characteristic points and the image coordinate values of the plurality of characteristic points in the image and for deciding the position of the aim point according to the transformation matrix.

Claims

1. A positioning device for positioning an aim point on a screen comprising:

a screen for displaying a plurality of characteristic points with known screen coordinate values;

a pointer, for pointing at a position on the screen and forming an aim point at the position, the pointer comprising;

an image acquisition unit for acquiring an image according to the position of the aim point on the screen, wherein a center point of the image corresponds to the position of the aim point on the screen; and

a calculation unit for detecting the plurality of characteristic points in the image and calculating image coordinate values of the plurality of characteristic points in the image; and

a processor, coupled to the screen and the pointing apparatus, comprising;

a transformation matrix generation unit for establishing a transformation matrix according to the known screen coordinate values of the plurality of characteristic points and the image coordinate values of the plurality of characteristic points in the image; and

a position decision unit for converting coordinate values of the center point of the image to those of the aim point on the screen for deciding the position of the aim point on the screen according to the transformation matrix.

2. The positioning device of claim 1, wherein the plurality of characteristic points are displayed as corners of specific geometric figures on the screen.

3. The positioning device of claim 1, wherein the plurality of characteristic points have specific colors.

4. The positioning device of claim 1, wherein the plurality of characteristic points have specific shapes.

5. The positioning device of claim 1, wherein the number of the plurality of characteristic points is at least two.

6. The positioning device of claim 1, wherein the plurality of characteristic points vary with different images.

7. The positioning device of claim 1, wherein the pointing apparatus is a light gun.

8. The positioning device of claim 1, wherein the pointing apparatus is a computer mouse.

9. A positioning method for positioning an aim point on a screen pointed by a pointer comprising:

displaying a plurality of characteristic points with known screen coordinate values on a screen;

forming an aim point at a position on the screen pointed at by the pointer;

acquiring an image according to the position of the aim point on the screen, wherein a center point of the image corresponds to the position of the aim point on the screen;

detecting the plurality of characteristic points in the image and calculating image coordinate values of the plurality of characteristic points in the image;

establishing a transformation matrix according to the known screen coordinate values of the plurality of characteristic points and the image coordinate values of the plurality of characteristic points in the image; and

converting coordinate values of the center point of the image to those of the aim point on the screen for deciding the position of the aim point on the screen according to the transformation matrix.

10. The positioning method of claim 9, wherein the plurality of characteristic points are displayed as corners of specific geometric figures on the screen.

11. The positioning method of claim 9, wherein the plurality of characteristic points have specific colors.

12. The positioning method of claim 9, wherein the plurality of characteristic points have specific shapes.

13. The positioning method of claim 9, wherein the number of the plurality of characteristic points is at least two.

14. The positioning method of claim 9, wherein the plurality of characteristic points vary with different images.

15. The positioning method of claim 9, wherein the pointer is a light gun.

16. The positioning method of claim 9, wherein the pointer is a computer mouse.

17. A positioning device for an image sensor comprising:

a screen for displaying a plurality of characteristic points with known screen coordinate values;

an image sensor, for acquiring an image, the image sensor comprising;

a calculation unit for detecting the plurality of characteristic points in the image and calculating image coordinate values of the plurality of characteristic points in the image; and

a processor, coupled to the screen and the image sensor, comprising;

a projection matrix generation unit for establishing a projection matrix according to the known screen coordinate values of the plurality of characteristic points and the image coordinate values of the plurality of characteristic points in the image; and

a position decision unit for computing a position and a direction of the image sensor relative to a screen coordinate system according to the projection matrix.

18. The positioning device of claim 17, wherein the plurality of characteristic points are displayed as corners of specific geometric figures on the screen.

19. The positioning device of claim 17, wherein the plurality of characteristic points have specific colors.

20. The positioning device of claim 17, wherein the plurality of characteristic points have specific shapes.

21. The positioning device of claim 17, wherein the number of the plurality of characteristic points is at least six.

22. The positioning device of claim 17, wherein the plurality of characteristic points vary with different images.

23. The positioning device of claim 17, wherein the projection matrix comprises an extrinsic matrix and an intrinsic matrix.

24. The positioning device of claim 23, wherein the position decision unit computes the position and the direction of the image sensor relative to the screen coordinate system according to the extrinsic matrix.

25. The positioning device of claim 17, wherein the image sensor is installed in a light gun.

26. The positioning device of claim 17, wherein the image sensor is installed in a game control device.

27. A positioning method for an image sensor comprising:

displaying a plurality of characteristic points with known screen coordinate values on a screen;

acquiring an image for detecting the plurality of characteristic points in the image and calculating image coordinate values of the plurality of characteristic points in the image;

establishing a projection matrix according to the known screen coordinate values of the plurality of characteristic points and the image coordinate values of the plurality of characteristic points in the image; and

computing a position and a direction of the image sensor relative to a screen coordinate system according to the projection matrix.

28. The positioning method of claim 27, wherein the plurality of characteristic points are displayed as corners of specific geometric figures on the screen.

29. The positioning method of claim 27, wherein the plurality of characteristic points have specific colors.

30. The positioning method of claim 27, wherein the plurality of characteristic points have specific shapes.

31. The positioning method of claim 27, wherein the number of the plurality of characteristic points is at least six.

32. The positioning method of claim 27, wherein the plurality of characteristic points vary with different images.

33. The positioning method of claim 27, wherein the projection matrix comprises an extrinsic matrix and an intrinsic matrix.

34. The positioning method of claim 33, wherein computing the position and the direction of the image sensor relative to the screen coordinate system according to the projection matrix is computing the position and the direction of the image sensor relative to the screen coordinate system according to the extrinsic matrix.

35. The positioning method of claim 27, wherein the image sensor is installed in a light gun.

36. The positioning method of claim 27, wherein the image sensor is installed in a game control device.