Optical mouse and parameter calibration method thereof

Patent metadata

Field	Value
Publication number	US-10303265-B2
Application number	US-201715727712-A
Country	US
Kind code	B2
Filing date	Oct 9, 2017
Priority date	Mar 15, 2017
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

This present invention discloses an optical mouse and a parameter calibration method thereof. The optical mouse includes: a light source, an image capturing unit, a memory unit and a processing unit, and the parameter calibration method of the optical mouse includes: capturing images formed by the reflective light projected from the mouse pad when the optical mouse is placed upon the mouse pad and has a relative displacement between the mouse pad, and then producing image frames according to the images; determining if any pattern information is found in the image frames; further, setting parameters of the optical mouse when at least one of the pattern information is found in the frames, in which, the pattern information is composed of a pattern of the mouse pad.

First claim

What is claimed is:

1. A parameter calibration method for an optical mouse, in which the optical mouse has a light source used for producing a light onto a mouse pad on which the optical mouse is placed, an image capturing unit used for capturing a plurality of images from a corresponding reflective light of the mouse pad according to an image capturing frequency so as to generate a plurality of image frames, a memory unit used for storing multiple pattern information, and a processing unit coupled to the image capturing unit and the memory unit and used for processing the image frames, comprising the steps of:
when the optical mouse is placed against the mouse pad and moves relative to the mouse pad, capturing the images formed by the reflective light in a period of a relative displacement and then generating the image frames according to the images;
determining if any pattern information is found in the image frames; and
setting parameters of the optical mouse when at least one of the pattern information is found in the image frames;
wherein, the pattern information found in the image frames are formed by a pattern of the mouse pad.

2. The parameter calibration method for an optical mouse according to claim 1 , wherein determination of whether any pattern information is made in the image frames is according to a barcode which is formed sequentially by time periods of bright or dark areas of the image frames along a sliding direction of the optical mouse, and wherein the multiple pattern information are multiple default barcodes, so that when the barcode matches with any of the default barcodes, the parameters of the optical mouse are calibrated to match corresponding default parameters of the default barcode.

3. The parameter calibration method for an optical mouse according to claim 1 , wherein, when at least one of the image frames matches a pattern information representing that a surface of the mouse pad is a glossy surface, the parameters of the optical mouse are calibrated by reducing an exposure value of the optical mouse or decreasing a computing performance for processing image feature comparison of the optical mouse.

4. The parameter calibration method for an optical mouse according to claim 3 , wherein, the exposure value of the optical mouse is reduced by shortening a glowing period of the light source or weakening a glowing strength of the light source.

5. The parameter calibration method for an optical mouse according to claim 1 , wherein, when at least one of the image frames matches a pattern information representing that a surface of the mouse pad is a matted surface, the parameters of the optical mouse are calibrated by increasing an exposure value of the optical mouse or raising a computing performance for processing image feature comparison of the optical mouse.

6. The parameter calibration method for an optical mouse according to claim 5 , wherein, the exposure value of the optical mouse is increased by extending a glowing period of the light source or increasing a glowing strength of the light source.

7. The parameter calibration method for an optical mouse according to claim 1 , before the step of creating the image frames, further including a step of:
triggering a parameter automation calibration program when a specific input operation created by an operation interface of the optical mouse is detected.

8. The parameter calibration method for an optical mouse according to claim 1 , before the step of creating the relative displacement, further including a step of:
triggering a parameter automation calibration program when parameter calibration software executed by a computer that is connected with the optical mouse is detected.

9. The parameter calibration method for an optical mouse according to claim 1 , before the step of creating the relative displacement, further including a step of:
triggering a parameter automation calibration program when a performance efficiency is detected as being lower than a default value;
wherein, a light signal is displayed on a housing of the optical mouse to indicate that the optical mouse is executing the parameter automation calibration program.

10. The parameter calibration method for an optical mouse according to claim 1 , wherein the pattern information are at least one of a barcode, a logo, a grain or texture of the mouse pad, and a color of the mouse pad.

11. An optical mouse, comprising:
a light source used for creating a light to project the light to a mouse pad on which the optical mouse is placed;
an image capturing unit used for capturing a plurality of images from a corresponding reflective light of the mouse pad according to an image capturing frequency so as to generate a plurality of image frames;
a memory unit used for storing multiple pattern information; and
a processing unit coupled to the image capturing unit and the memory unit and used for processing the image frames;
wherein, parameters of the optical mouse are set when at least one of the pattern information is found in the image frames, in which the image frames are generated according to the images which are formed by the reflective light when the optical mouse placed on the mouse pad moves relative to the mouse pad;
wherein, the pattern information found in the image frames are formed by a pattern of the mouse pad.

12. The optical mouse according to claim 11 , wherein determination of whether any pattern information is in the image frames is made according to a barcode which is formed sequentially by time periods of bright or dark areas of the image frames along a sliding direction of the optical mouse, and wherein multiple pattern information are multiple default barcodes, so that when the barcode matches with any of the default barcodes, the parameters of the optical mouse are calibrated to match corresponding default parameters of the default barcode.

13. The optical mouse according to claim 11 , wherein, when at least one of the image frames matches a pattern information representing that a surface of the mouse pad is a glossy surface, the parameters of the optical mouse are calibrated by reducing an exposure value of the optical mouse or decreasing a computing performance for processing image feature comparison of the optical mouse.

14. The optical mouse according to claim 13 , wherein, the exposure value of the optical mouse is reduced by shortening a glowing period of the light source or weakening a glowing strength of the light source.

15. The optical mouse according to claim 11 , wherein, when at least one of the image frames matches a pattern information representing that a surface of the mouse pad is a matted surface, the parameters of the optical mouse are calibrated by increasing an exposure value of the optical mouse or raising a computing performance for processing image feature comparison of the optical mouse.

16. The optical mouse according to claim 15 , wherein, the exposure value of the optical mouse is increased by extending a glowing period of the light source or increasing a glowing strength of the light source.

17. The optical mouse according to claim 11 , wherein a trigger timing for the processing unit to execute a parameter automation calibration program comprises:
triggering the parameter automation calibration program when a specific input operation created by an operation interface of the optical mouse is detected.

18. The optical mouse according to claim 11 , wherein a trigger timing for the processing unit to execute a parameter automation calibration program further comprises:
trigge

Assignees

• Pixart Imaging Inc

Inventors

• Wang Tsung-Fa
• Kuo Shih-Wei

Classifications

• G06K7/10772

  Moved readers, e.g. pen, wand · CPC title

• G06F3/0317

  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 title

• G06F3/039 Primary

  Accessories therefor, e.g. mouse pads · CPC title

• G06F3/0321 Primary

  by optically sensing the absolute position with respect to a regularly patterned surface forming a passive digitiser, e.g. pen optically detecting position indicative tags printed on a paper sheet (constructional details of pen-shaped pointing devices G06F3/03545, G06F3/03542, G06F3/037) · CPC title

• G06F3/03542

  Light pens for emitting or receiving light · CPC title