OPTICAL NAVIGATION DEVICE AND RELATED AUTOMATIC MAGNIFICATION ADJUSTING METHOD

• US 20160209935A1
• Filed: 01/21/2015
• Published: 07/21/2016
• Est. Priority Date: 01/21/2015
• Status: Active Grant

• Current Assignee: Pixart Imaging (Penang) Sdn. Bhd. (PixArt Imaging Incorporated)
• Original Assignee: Pixart Imaging (Penang) Sdn. Bhd. (PixArt Imaging Incorporated)
• Inventors: LEE, Sai Mun
• Granted Patent: US 9,817,488 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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
• CPC Class Codes: G06F 3/03543 Mice or pucks G06F3/03541 takes precedence

Abstract

An automatic magnification adjusting method is applied to an optical navigation device. The optical navigation device has an illumination channel, a reference channel and an imaging channel. The reference channel has a reference feature with a known parameter. The automatic magnification adjusting method includes driving the illumination channel and the reference channel to alternatively output a detecting image and a reference image, capturing a series of navigation images consisting of the detecting image and the reference image by the imaging channel, analyzing the reference image to recognize the reference feature, calculating a compensating factor according to a detected parameter of the reference feature, and adjusting magnification of the detecting image by the compensating factor to output corresponding coordinate displacement.

Claims

1. An automatic magnification adjusting method applied to an optical navigation device, the optical navigation device having an illumination channel, a reference channel and an imaging channel, the reference channel having at least one reference feature with a known parameter, the automatic magnification adjusting method comprising:

driving the illumination channel and the reference channel to alternatively output a detecting beam and a reference beam;

capturing a series of navigation images consisting of a detecting image formed by the detecting beam and a reference image formed by the reference beam via the imaging channel;

analyzing the reference image to recognize the reference feature;

calculating a compensating factor according to a detected parameter of the reference feature; and

adjusting magnification of the detecting image by the compensating factor to output corresponding coordinate displacement.

2. The automatic magnification adjusting method of claim 1, wherein calculating the compensating factor according to the detected parameter of the reference feature comprises:

comparing the detected parameter with the known parameter; and

calculating the compensating factor according to a comparison between the detected parameter and the known parameter.

3. The automatic magnification adjusting method of claim 1, wherein adjusting the magnification of the detecting image by the compensating factor to output the corresponding coordinate displacement comprises:

analyzing original coordinate displacement of the detecting image; and

generating the corresponding coordinate displacement by calculation of the original coordinate displacement and the compensating factor.

4. The automatic magnification adjusting method of claim 1, wherein the reference channel is periodically driven to output the reference image, or is driven to output the reference image according to an estimation vector of the optical navigation device.

5. The automatic magnification adjusting method of claim 1, wherein the reference channel comprises a reference light source and a reference optical component, the reference feature is selectively disposed on the reference light source or the reference optical component.

6. The automatic magnification adjusting method of claim 1, wherein the known parameter is represented by dimensional characteristics.

7. The automatic magnification adjusting method of claim 1, wherein the reference feature comprises a plurality of reference points, and the known parameter represents a distance between the reference points.

8. An optical navigation device with automatic magnification adjusting function, the optical navigation device comprising:

an illumination channel for outputting a detecting beam;

a reference channel disposed by the illumination channel, the reference channel comprising a reference feature with a known parameter and being adapted to output a reference beam;

an imaging channel disposed by the illumination channel and the reference channel for capturing a detecting image formed by the detecting beam and a reference image formed by the reference beam;

a controller electrically connected to the illumination channel, the reference channel and the imaging channel, the controller being adapted to drive the illumination channel and the reference channel to alternatively output the detecting image and the reference image, to analyze the reference image to recognize the reference feature, to calculate a compensating factor according to a detected parameter of the reference feature, and to adjust magnification of the detecting image by the compensating factor so as to output corresponding coordinate displacement.

9. The optical navigation device of claim 8, wherein the controller compares the detected parameter with the known parameter and calculates the compensating factor according to a comparison between the detected parameter and the known parameter, the controller further analyzes original coordinate displacement of the detecting image and generates the corresponding coordinate displacement by calculation of the original coordinate displacement and the compensating factor.

10. The optical navigation device of claim 8, wherein the controller drives the reference channel to periodically output the reference image, or drives the reference channel to output the reference image according to an estimation vector of the optical navigation device.

11. The optical navigation device of claim 8, wherein the reference channel comprises a reference light source and a reference optical component, the reference feature is selectively disposed on the reference light source or the reference optical component.

12. The optical navigation device of claim 11, wherein the reference feature is a small-size convex lens formed on the reference optical component or an emitting surface of the reference light source.

13. The optical navigation device of claim 8, wherein the known parameter is represented by dimensional characteristics.

14. The optical navigation device of claim 8, wherein the reference feature comprises a plurality of reference points, and the known parameter represents a distance between the reference points.

15. An automatic magnification adjusting method applied to an optical navigation device, the optical navigation device having an illumination channel and an imaging channel, the illumination channel having a reference feature with a known parameter, the automatic magnification adjusting method comprising:

capturing a detecting image output by the illumination channel by the imaging channel;

analyzing the detecting image to recognize the reference feature;

calculating a compensating factor according to a detected parameter of the reference feature;

removing the reference feature from the detecting image; and

adjusting magnification of the detecting image with removal of the reference feature by the compensating factor to output corresponding coordinate displacement.

16. The automatic magnification adjusting method of claim 15, wherein calculating the compensating factor according to the detected parameter of the reference feature comprises:

comparing the detected parameter with the known parameter; and

calculating the compensating factor according to a comparison between the detected parameter and the known parameter.

17. The automatic magnification adjusting method of claim 15, wherein adjusting the magnification of the detecting image by the compensating factor to output the coordinate displacement comprises:

analyzing original coordinate displacement of the detecting image; and

generating the corresponding coordinate displacement by calculation of the original coordinate displacement and the compensating factor.

18. The automatic magnification adjusting method of claim 15, wherein the illumination channel comprises a detecting light source and a detecting optical component, the reference feature is selectively disposed on the detecting light source or the detecting optical component.

19. The automatic magnification adjusting method of claim 15, wherein the known parameter is represented by dimensional characteristics.

20. The automatic magnification adjusting method of claim 15, wherein the reference feature comprises a plurality of reference points, and the known parameter represents a distance between the reference points.

21. An optical navigation device with automatic magnification adjusting function, the optical navigation device comprising:

an illumination channel comprising a reference feature with a known parameter and being adapted to output a detecting beam to form a detecting image;

an imaging channel disposed by the illumination channel for capturing the detecting image; and

a controller electrically connected to the illumination channel and the imaging channel, the controller being adapted to analyze the detecting image to recognize the reference feature, to calculate a compensating factor according to a detected parameter of the reference feature, to remove the reference feature from the detecting image, and to adjust magnification of the detecting image with removal of the reference feature by the compensating factor to output corresponding coordinate displacement.

22. The optical navigation device of claim 21, wherein the controller compares the detected parameter with the known parameter and calculates the compensating factor according to a comparison between the detected parameter and the known parameter, the controller further analyzes original coordinate displacement of the detecting image and generates the corresponding coordinate displacement by calculation of the original coordinate displacement and the compensating factor.

23. The optical navigation device of claim 21, wherein the illumination channel comprises a detecting light source and a detecting optical component, the reference feature is selectively disposed on the detecting light source or the detecting optical component.

24. The optical navigation device of claim 23, wherein the reference feature is a small-size convex lens formed on the detecting optical component or an emitting surface of the detecting light source.

25. The optical navigation device of claim 21, wherein the known parameter is represented by dimensional characteristics.

26. The optical navigation device of claim. 21, wherein the reference feature comprises a plurality of reference points, and the known parameter represents a distance between the reference points.