CN103729071B - Optical navigator and optical navigation method - Google Patents
Optical navigator and optical navigation method Download PDFInfo
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- CN103729071B CN103729071B CN201210392830.4A CN201210392830A CN103729071B CN 103729071 B CN103729071 B CN 103729071B CN 201210392830 A CN201210392830 A CN 201210392830A CN 103729071 B CN103729071 B CN 103729071B
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Abstract
The invention discloses a kind of optical navigator, comprising：Light source, is used to illuminate surface form image；Image sensor, to the picture frame in pick-up image；And controller, the first estimated speed of optical navigator is calculated according to the second picture frame of the first picture frame and position after the first picture frame in picture frame and the first picture frame group is defined, first picture frame group contains the multiple picture frames with the second picture frame, and according to the first estimated speed control first picture frame group parameter with process the first picture frame group in all of picture frame, wherein first picture frame group parameter include：Light source is not to the not illumination frequencies and following parameters wherein at least one of the picture frame illumination in first picture frame group：Image sensor does not capture the search area of the picture frame in the calculating frequency and the first picture frame group that or not the picture frame captured by image sensor in frequency, controller calculating the first picture frame group of the picture frame in the first picture frame group.
Description
Technical field
The present invention relates to a kind of optical navigator and optical navigation method, can estimate that optics is led more particularly to one kind
The translational speed of boat device and the according to this optical navigator and optical navigation method of adjustment polishing frequency.
Background technology
Optical navigator of the prior art, can be first with one surface of a light source lighting to form an image, so
Afterwards with the picture frame in an image sensor pick-up image, and calculate to calculate light extraction one by one for each picture frame in image
The translational speed of guider is learned to perform tracking.
Fig. 1 is referred to, its optical mouse 100 for depicting prior art, optical mouse is optical navigator
It is a kind of.As shown in figure 1, optical mouse 100 contains an image sensor 105 of controller 103, of light source 101,
Light source 101, controller 103 and image sensor 105 are co-located on circuit board 107.And optical mouse 100 is further
Include a battery 109 and be used to provide electric energy to optical mouse 100.Light source 101 is used to illuminate (such as a mouse of surface 102
Mark placed desktop) to form an image.Image sensor 105 is to the picture frame (frame) in pick-up image.Controller
103 picture frames captured according to image sensor 105 are dynamic to be tracked to calculate the speed and acceleration of optical mouse 100
Make.
Fig. 2 is referred to, the tracking action that it depicts this optical mouse 100.As shown in Fig. 2 optical mouse 100 can be even
Continuous acquisition picture frame simultaneously continuously performs calculating action and calculates the speed and acceleration of optical mouse 100.However, such
Mode because light source 101 surface 102 can be illuminated incessantly, the constantly pick-up image of image sensor 105, and control
Device 103 also must be calculated constantly, quite consume electric energy.Particularly optical navigator is in high-speed mobile, because can increase chasing after
The difficulty of track, it may be desirable to illumination, pick-up image and calculating are performed with upper frequency, therefore amount of calculation and power consumption can be notable
Ground increases.Modern electronic installation is constantly towards light and handy mini direction in evolution, therefore the volume of battery 109 can be subject to very big
Limitation, electric power storage also can be reduced and then, therefore the optical navigator of optical mouse etc can be caused to continue a journey hypodynamic problem.
The content of the invention
Therefore, it is an object of the invention to disclose a kind of optical navigator for saving electric energy and optical guidance side
Method.
One embodiment of the present of invention discloses a kind of optical navigator, comprising：Light source, is used to illuminate surface formed
Image；Image sensor, is used to capture the picture frame in the image；And controller, according to the first picture frame in the plurality of picture frame with
And second picture frame of the position after first picture frame calculates the first estimated speed of the optical navigator, and according to this first
Estimated speed defines the first picture frame group, and first picture frame group contains the multiple picture frames with second picture frame, and according to this
One estimated speed control first picture frame group parameter with process first picture frame group in all of picture frame, wherein first picture frame
The parameter of group includes：The light source not to first picture frame group in picture frame illumination not illumination frequencies and following parameters wherein
At least one：The image sensor do not capture the picture frame in first picture frame group do not capture frequency, the controller calculate this
The search model of the picture frame in the calculating frequency of the picture frame captured by the image sensor in one picture frame group and first picture frame group
Enclose.
A kind of optical navigation method is it is also proposed in other embodiments of the present invention, this optical navigation method can be comprising execution
The action of aforementioned optical guider, will not be repeated here.
According to foregoing embodiment, the present invention not only can not illuminate frequency according to the adjustment of the operating state of optical navigator
Rate, frequency and calculating frequency are not captured to save electric energy, can more adjust search area size to save amount of calculation, more to subtract
The consumption of few energy.
Brief description of the drawings
Fig. 1 depicts an optical mouse of prior art.
Fig. 2 depicts the tracking action of the optical mouse shown in Fig. 1.
Fig. 3 depicts optical navigator disclosed in this invention tracking action schematic diagram in high speed mode.
Fig. 4 depicts tracking action schematic diagram of the optical navigator disclosed in this invention under middle fast mode.
Fig. 5 depicts optical navigator disclosed in this invention tracking action schematic diagram in the low-speed mode.
Fig. 6 depicts the tracking action flow chart of optical navigator disclosed in this invention.
Wherein, description of reference numerals is as follows：
100 optical mouse
101 light sources
103 controllers
105 image sensors
107 circuit boards
109 batteries
601-625 steps
Specific embodiment
Some vocabulary have been used to censure specific element in the middle of specification and claim above.Have in art
Usually intellectual is, it is to be appreciated that hardware manufacturer may call same element with different nouns.This specification and
Claim above is come not in the way of the difference of title is used as distinguishing element with element difference functionally
As the criterion distinguished.In the whole text, the "comprising" of specification and claim above mentioned in is an open use
Language, therefore " include but be not limited to " should be construed to.
The tracking action schematic diagram of optical navigator disclosed in this invention described in detail below, it is noted that
Optical mouse 100 shown in following description using Fig. 1 is explained as example, it is not intended that content disclosed in this invention is only
Can be performed by the optical mouse 100 shown in Fig. 1.Other have light source, image sensor and are used to control light source and shadow
As the optical navigator of the controller of sensor all should be in the range of the present invention covers.Disclosed embodiment of this invention
In, it is also that surface 102 is illuminated to form an image by the light source 101 in optical mouse 100, and with image sensor 105
Picture frame in pick-up image.But controller 103 will not as shown in Figure 2 as constantly make light source 101 illuminate surface 102, also will not
Constantly calculate the picture frame of acquisition, but can be according to first picture frame in picture frame and position after the first picture frame the
Two picture frames calculate first estimated speed of optical mouse, and judge that optical mouse 100 is according to the first estimated speed
In that velocity mode, to define picture frame group (Group of Pictures, GOP).Second picture frame can be connected at first
After picture frame, or it is separated by least one picture frame, beneath embodiment is illustrated to be connected at after the first picture frame, but not
It is used to limit the present invention.This picture frame group contains the multiple picture frames with second picture frame.Additionally, controller 103 is with judgement
Speed-mode control following parameters wherein at least one：Light source 101 is not to one of the picture frame illumination after second picture frame
Illumination frequencies, image sensor 105 do not capture of the picture frame after second picture frame and do not capture frequency, controller 103
Calculate a picture frame calculated after frequency and the second picture frame of the picture frame captured by the image sensor after second picture frame
A search area.
In the following embodiments, optical mouse can judge according to the first estimated speed be position at a high speed, middling speed and low
That in fast mode.Fig. 3 is referred to, it depicts optical navigator disclosed in this invention chasing after in high speed mode
Track acts schematic diagram.In figure 3, controller 103 can be calculated according to picture frame 0 and 1 (foregoing the first picture frame and the second picture frame)
Go out first estimated speed of optical mouse 100, wherein picture frame 0 can be last picture frame in a picture frame group.And
Judge that optical mouse 100 should be belonging to fast mode according to the first estimated speed, and according to this decision picture frame group length (i.e.
Comprising being 16 picture frame 1-16 in how many picture frames, this example), not the frequency of pick-up image (also represent the frequency not illuminated
Rate).In the embodiment shown in fig. 3, the size of picture frame group is configured to 16 picture frames, and 16 picture frames in picture frame group can be false
If its speed is the speed for being calculated according to picture frame 0 and 1 and being gone out.Therefore part picture frame can not be captured and calculated, such as picture frame
2nd, 5-7,10-15, with the electric energy needed for reducing illumination and calculating.
However, when the picture frame of same picture frame group is processed, can follow and be calculated according to picture frame 0 and 1 and gone out at the beginning
Trend (i.e. this is under that velocity mode) processes whole picture frame group, but can also be calculated for part picture frame and update
Gesture.In Fig. 3 to Fig. 4, the curve with arrow represents calculating action between picture frame.Such as between picture frame 3 and 4 song with arrow
Line just represents picture frame 3 and 4 and is used to calculate.Under the fast mode of Fig. 3, speed is fast but acceleration is small, therefore with the company of acquisition
Continue two picture frames to calculate (but not limiting).For example, picture frame 3 and 4 is calculated, and calculates picture frame 8 and 9.And because accelerate
Degree is small, therefore need not calculate the picture frame in picture frame group too many time and correct trend, therefore is only calculated in embodiment shown in Fig. 3
Picture frame 3 and 4 in picture frame group, and picture frame 8 and 9.Please note that the speed that calculates of picture frame in picture frame group and acceleration
Degree can also be used to change velocity mode, for example, become middle fast mode from fast mode, will describe in addition down below.And in treatment
In complete picture frame group after all of picture frame, last picture frame 16 that controller 103 can be in script picture frame is with next picture frame 17
After calculating the second estimated speed, using picture frame 17 as first picture frame of next picture frame group, continue foregoing action.
If judging that optical mouse 100 is in the embodiment of middle fast mode, its tracking action and Fig. 3 according to picture frame 0 and 1
Can be different.Fig. 4 depicts tracking action schematic diagram of the optical navigator disclosed in this invention under middle fast mode.
Under middle fast mode, velocity amplitude is smaller, is not necessary to capture continuous picture frame, therefore the discontinuous picture frame of embodiment fechtable in Fig. 4
4th, 6 and 8.However, because acceleration may be larger, must relatively frequently calculate the picture frame in picture frame group to ensure according to the He of picture frame 0
1 trend for calculating is correct.Therefore in the fig. 4 embodiment, picture frame 1,4,6,8 and 9 is used to calculate the speed between it
Degree ensures the degree of accuracy of prediction.
If judging that optical mouse 100 is in low-speed mode according to picture frame 0 and 1, the reality of its tracking action and Fig. 3, Fig. 4
Example is applied to would also vary from.Fig. 5 depicts optical navigator disclosed in this invention tracking action in the low-speed mode and shows
It is intended to.Under this scheme, optical mouse 100 is not substantially moved, and the frequency of illumination and pick-up image can be preferably minimized, because
In the embodiment of this Fig. 5 in addition to initial picture frame 1, picture frame 8 is only captured, to reduce the power consumption of illumination.However,
In the case of this in order to avoid neutral gear during slip up, can reduce picture frame group quantity, therefore in Fig. 5 embodiments picture frame group
Quantity be configured to 8, be configured to 16 rather than such as Fig. 3 and Fig. 4.
In addition to reducing the frequency for capturing picture frame and calculating, the present invention is more proposed and can changed according to friction speed pattern
Become the concept of search area, so-called search area refers to the pixel coverage size that a picture frame is covered.Search area is big
Picture frame can be easier to find out the trend of image change, but need larger amount of calculation.On the contrary, the small picture frame of search area compared with
It is not easy to find out the trend that image changes, but required amount of calculation is smaller.In the fig. 3 embodiment, because picture frame 0 and 1 is to be used to
Find out trend and determine that speed is used, therefore use larger search area 9x9 (i.e. picture frame length and width are 9 pixels).And
Determine after speed and trend, can be considered that picture frame change is relatively stablized, therefore search area can be reduced, therefore picture frame 3 and 4 is used
Less search area 5x5.And after a period of time does not capture picture frame, possible trend can be changed, therefore by picture frame 8 and 9
It is set to 7x7.
And in the fig. 4 embodiment, picture frame 0 uses larger search area 9x9 as 1, but become under fast mode because in
Gesture change is fiercer, therefore picture frame 4 does not use less search area 5x5, but using the search area 7x7 for taking second place, and
Follow-up picture frame 6,8,9 has used less search area 5x5 because trend tends towards stability.
And in the 5 embodiment of figure 5 because change is fairly small, thus as previously described as capture picture frame ratio it is relatively low, but
Also because so, picture frame 0,1 and 8,9 all uses maximum search area 9x9, to ensure to capture picture frame every time and calculate according to this
When, can quickly calculate the trend of picture frame group.Foregoing search area setting is only used to illustrate, and knows this those skilled in the art when can root
According to foregoing any setting search area of teaching, it does not also take off the scope of the present invention.
As it was previously stated, the present invention is not limited only to after first two picture frames calculate estimated speed and trend, just always according to
Remaining picture frame in this trend treatment picture frame group is followed, it can calculate another estimated speed according to other picture frames in picture frame group
Afterwards, estimated speed is updated, and after calculating acceleration with previous estimated speed, judges whether to need change trend, or whether
Using new velocity mode.And the picture frame number of picture frame group and the frequency of acquisition picture frame are changed according to judged result.It is with Fig. 3
Example, after it can calculate another estimated speed according to picture frame 3 and 4, updates the estimated speed of picture frame group, and according to calculating picture frame
The estimated speed that 3 and 4 estimated speeds for obtaining and calculating picture frame 0 and 1 are obtained calculates acceleration, and according to calculating picture frame 3 and 4
The estimated speed and acceleration for obtaining judge whether to need change trend.For example, if according to new estimated speed and acceleration
Degree judge optical mouse should using low-speed mode, then by the picture frame number of picture frame group with image capture frequency setting into shown in Fig. 5
Low-speed mode.Please note that the estimated speed between picture frame directly can calculate to try to achieve, also can calculate to try to achieve indirectly.To scheme
As a example by 3, the speed between picture frame to be calculated 4 and picture frame 1 can be calculated directly, but also may be used with the displacement of picture frame 4 and picture frame 1
Calculated using the displacement between picture frame 4 and 0.
Also therefore, another aspect disclosed in this invention is not set picture frame group, only by estimated speed and acceleration
Degree constantly update optical mouse residing for trend, and set according to this not illumination frequencies, do not capture frequency, calculate frequency and search
Range size.
Fig. 6 depicts the tracking action flow chart of optical navigator disclosed in this invention, it comprises the following steps
601-623, each step is explained by taking the embodiment of Fig. 3 as an example in the following description, but also can corresponding diagram 4 and Fig. 5 implementation
Example.
Step 601
Capture with reference to picture frame (such as picture frame 0).
Step 603
Capture picture frame (such as picture frame 1) now.
Step 605
Calculate relative motion (calculating estimated speed).
Step 607
Velocity mode is determined according to estimated speed.Determine to use fast mode, middle fast mode or low-speed mode.Must note
Meaning, the present invention is not defined as using these three patterns, also can only be divided into the pattern of two patterns or more, and this class becomes
Change all should be within the scope of disclosed in this invention.
Step 609
Determine whether to pick-up image.If if then arriving step 613, otherwise arriving step 611.Step 609 is according to step
607 velocity modes for being determined decide whether to capture picture frame, for example, can capture picture frame 3 in figure 3, but in fig. 4
Picture frame 3 will not then be captured.
Step 611
According to Trend Prediction speed now.The speed estimated as picture frame group according to newest estimated speed.In Fig. 3
In, if after calculating estimated speed according to picture frame 0 and 1, never capturing picture frame and calculating new speed and no more dynamic model
Formula, the then estimated speed that can be calculated using picture frame 0 and 1 always estimate speed as picture frame group's, if but having to calculate and new estimating
Calculate speed (such as picture frame 3 and 4), then can new estimated speed be used as picture frame group estimate speed.
Step 613
Capture picture frame.
Step 615
Judge whether to calculate estimated speed.The picture frame 3 of such as Fig. 3, it only can calculate speed after being subtracted with follow-up picture frame 4
Degree, but will not be with the calculating speed of picture frame 2.If otherwise arriving step 611, if then arriving step 617.
Step 617
Estimated speed is calculated, such as estimated speed is calculated with the picture frame 3 and 4 in picture frame group again in Fig. 3.Step 619
Acceleration is calculated according to two estimated speeds.For example with the estimated speed of picture frame 0 and 1, and picture frame 3 in Fig. 3
Estimated speed with 4, calculates acceleration.
Step 621
Speed and acceleration in step 617 and 619 judge trend.
Step 623
Whether velocity mode is changed according to Trend judgementIf then arriving step 607 resets pattern, if otherwise arriving step
625。
Step 625
Judge whether be picture frame group last picture frame.If (such as the picture frame 16 of Fig. 3) then arrives step 603 and captures now
Modern picture frame (picture frame 17), if otherwise returning to the action that step 609 continues step 609-623.
It is noted that in other embodiments, trend can also be determined by multiple speed with multiple acceleration, and
Do not limit and using the second estimated speed and an acceleration.By taking Fig. 3 as an example, the estimated speed of its usable picture frame 0,1, picture frame 1,3
Estimated speed (or estimated speed of picture frame 0,3), the estimated speed of picture frame 3,4 and the acceleration produced by these estimated speeds
Spend to judge trend.
According to foregoing embodiment, corresponding optical navigation method can be obtained, it can perform aforementioned optical navigation
The action of device, this optical navigation method can be by storing in an embodied on computer readable media (such as hard disk, CD, interior
Deposit) on program code perform.Because its detailed step is identical with the action of aforementioned optical guider, therefore herein not
Repeat again.
According to foregoing embodiment, the present invention not only can not illuminate frequency according to the adjustment of the operating state of optical navigator
Rate, frequency and calculating frequency are not captured to save electric energy, can more adjust search area size to save amount of calculation, with more
Reduce the consumption of energy.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (22)
1. a kind of optical navigator, comprising：
Light source, is used to illuminate surface form image；
Image sensor, is used to capture the picture frame in the image；And
Controller, the light is calculated according to the second picture frame of the first picture frame in the plurality of picture frame and position after first picture frame
The first estimated speed of guider is learned, and the first picture frame group, wherein first picture frame group are defined according to first estimated speed
Comprising picture frame keep count of and be proportional to first estimated speed, first picture frame group contains the multiple figures with second picture frame
Frame, and according to first estimated speed control first picture frame group parameter with process first picture frame group in all of picture frame,
The parameter of wherein first picture frame group includes：The light source or not frequency to the picture frame illumination in first picture frame group
Rate and following parameters wherein at least one：The image sensor does not capture not capturing frequently for the picture frame in first picture frame group
Rate, the controller calculate the calculating frequency and first picture frame of the picture frame captured by the image sensor in first picture frame group
The search area of the picture frame in group.
2. optical navigator as claimed in claim 1, wherein second picture frame is next picture frame of first picture frame.
3. optical navigator as claimed in claim 1, the controller more judges that the optics is led according to first estimated speed
Boat device is in that in multiple velocity modes, and according to the speed-mode control following parameters wherein at least judged
One：First picture frame group in picture frame number, this not illumination frequencies, this do not capture frequency, the calculating frequency and the search model
Enclose.
4. optical navigator as claimed in claim 3, the controller more according in first picture frame group by the image sensing
Multiple picture frames that device is captured calculate the second estimated speed, and are calculated according to first estimated speed and second estimated speed
Go out the acceleration of the optical navigator, and optical guidance dress is obtained according to the plurality of estimated speed and the plurality of acceleration
The trend put, and according to the trend come following parameters wherein at least one：Picture frame number in first picture frame group, this does not illuminate frequency
Rate, this do not capture frequency, the calculating frequency and the search area.
5. optical navigator as claimed in claim 3, the wherein controller make the calculating frequency and the optical navigator
Acceleration be directly proportional.
6., according to the not illumination frequencies, this does not capture frequency for optical navigator as claimed in claim 3, the wherein controller
To adjust the size of the search area.
7. optical navigator as claimed in claim 3, after wherein the controller makes the light source not to second picture frame
3rd picture frame is illuminated and controls the image sensor not capture the 3rd picture frame.
8. optical navigator as claimed in claim 7, wherein the controller is more according to first picture frame and second figure
Picture frame after one of frame and second picture frame calculates the second estimated speed of the optical navigator, and according to this
First estimated speed and the plurality of second estimated speed obtain the trend of the optical navigator.
9. optical navigator as claimed in claim 7, wherein the controller is more according to the 4th figure after the 3rd picture frame
The 5th picture frame after frame and the 4th picture frame calculates the second estimated speed of the optical navigator, and according to this
One estimated speed and two estimated speed obtain the trend of the optical navigator.
10. optical navigator as claimed in claim 9, wherein the 4th picture frame and the 5th picture frame are discontinuous two
Picture frame.
11. optical navigators as claimed in claim 9, wherein the 4th picture frame are last figures of first picture frame group
Frame, and the 5th picture frame is first picture frame of next picture frame group.
A kind of 12. optical navigation methods, comprise the steps of：
Light source lighting surface is controlled to form image；
Control image sensor captures the picture frame in the image；And
The optical guidance is calculated according to the second picture frame of the first picture frame in the plurality of picture frame and position after first picture frame
First estimated speed of device, and the first picture frame group is defined according to first estimated speed, wherein first picture frame group includes
Picture frame keeps count of and is proportional to first estimated speed, and first picture frame group contains the multiple picture frames with second picture frame, and
According to first estimated speed control first picture frame group parameter with process first picture frame group in all of picture frame,
The parameter of wherein first picture frame group includes：The light source or not frequency to the picture frame illumination in first picture frame group
Rate and following parameters wherein at least one：The image sensor does not capture not capturing frequently for the picture frame in first picture frame group
Figure in rate, the calculating frequency for calculating the picture frame captured by the image sensor in first picture frame group and first picture frame group
The search area of frame.
13. optical navigation methods as claimed in claim 12, wherein second picture frame are next picture frames of first picture frame.
14. optical navigation methods as claimed in claim 12, further include：Judge the optics according to first estimated speed
Guider is in that in multiple velocity modes, and according to the speed-mode control following parameters judged wherein extremely
Few one：First picture frame group in picture frame number, this not illumination frequencies, this do not capture frequency, the calculating frequency and the search
Scope.
15. optical navigation methods as claimed in claim 14, further include：According to first picture frame group in passed by the image
The plural picture frame that sensor is captured calculates the second estimated speed, and according to first estimated speed and the second estimated speed meter
The acceleration of the optical navigator is calculated, and the optical guidance is obtained according to the plurality of estimated speed and the plurality of acceleration
The trend of device, and according to the trend come following parameters wherein at least one：Picture frame number in first picture frame group, this is not illuminated
Frequency, this do not capture frequency, the calculating frequency and the search area.
16. optical navigation methods as claimed in claim 14, further include：Make the calculating frequency and the optical navigator
Acceleration be directly proportional.
17. optical navigation methods as claimed in claim 14, further include：According to the light source according to the not illumination frequencies,
This does not capture frequency to adjust the size of the search area.
18. optical navigation methods as claimed in claim 14, further include：After making the light source not to second picture frame
3rd picture frame is illuminated and controls the image sensor not capture the 3rd picture frame.
19. optical navigation methods as claimed in claim 18, further include：Make first picture frame and second picture frame its
One of calculate the second estimated speed of the optical navigator with the picture frame after second picture frame, and according to this first
Estimated speed and the plurality of second estimated speed obtain the trend of the optical navigator.
20. optical navigation methods as claimed in claim 18, further include：According to the 4th picture frame after the 3rd picture frame
And the 4th the 5th picture frame after picture frame calculates the second estimated speed of the optical navigator, and according to this first
Estimated speed and two estimated speed obtain the trend of the optical navigator.
21. optical navigation methods as claimed in claim 20, wherein the 4th picture frame and the 5th picture frame are discontinuous
Two picture frames.
22. optical navigation methods as claimed in claim 20, wherein the 4th picture frame are last of first picture frame group
Picture frame, and the 5th picture frame is first picture frame of next picture frame group.
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| US11385069B2 (en) * | 2019-12-05 | 2022-07-12 | Pixart Imaging Inc. | Optical navigation device and optical navigation method |
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| US20050110746A1 (en) * | 2003-11-25 | 2005-05-26 | Alpha Hou | Power-saving method for an optical navigation device |
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| CN1722767A (en) * | 1999-10-28 | 2006-01-18 | 惠普公司 | Predictive and pulsed illumination of a surface in a micro-texture navigation technique |
| CN1517943A (en) * | 2003-01-07 | 2004-08-04 | 安捷伦科技有限公司 | Device for controlling screen pointer based on speed frame rate |
| TW200512655A (en) * | 2003-09-26 | 2005-04-01 | Sunplus Technology Co Ltd | Method and apparatus for controlling dynamic image capturing rate of an optical mouse |
| TW201122920A (en) * | 2009-12-18 | 2011-07-01 | Pixart Imaging Inc | Displacement detecting apparatus and method |
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