CN103019473B - The noise spot dynamic barrier method and device of electronic whiteboard based on imageing sensor - Google Patents
The noise spot dynamic barrier method and device of electronic whiteboard based on imageing sensor Download PDFInfo
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- CN103019473B CN103019473B CN201210507699.1A CN201210507699A CN103019473B CN 103019473 B CN103019473 B CN 103019473B CN 201210507699 A CN201210507699 A CN 201210507699A CN 103019473 B CN103019473 B CN 103019473B
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Abstract
The invention provides the noise spot dynamic barrier method and device of a kind of electronic whiteboard based on imageing sensor, the method includes: the continuous multiple frames picture of imageing sensor shooting described in detecting real-time；Search for described imagery zone inner area be less than preset area thresholding and be continued above the speck of Preset Time at same position；To add to described shielding area with this speck same position, region of the same area.The present invention can noise spot in dynamic barrier imagery zone.
Description
Technical field
The present invention relates to electronic whiteboard technology based on imageing sensor, particularly relate to a kind of based on imageing sensor
The noise spot dynamic barrier method and device of electronic whiteboard.
Background technology
Electronic whiteboard based on imageing sensor is a kind of new touch technology, and this technology is by traditional display device
Be transformed into have be similar to touch function can interactive display device.
Fig. 1 shows a kind of electronic whiteboard based on imageing sensor of the prior art, including: projector 101,
Imageing sensor 102, projection plane 103, main frame 104, what wherein main frame 104 was sent by projector 101 shows
Show image projection on projection plane 103, projection plane 103 is shot by imageing sensor 102, will projection
Showing picture and being incident upon the shooting picture transmission of the light pen luminous point projected on unilateral 103 to main in plane 103
Machine 104, main frame 104 extracts the luminous point in shooting picture, and correspondingly controls to adjust the display picture of projector 101
Face, feedback is made in the action to luminous point, it is achieved the function of similar touch screen.
About the further information of electronic whiteboard based on imageing sensor, it is referred on March 14th, 2012
The Chinese patent application document that publication No. is CN102375622A announced.
Referring still to Fig. 1, the locating module in main frame 104 analyzes the position of luminous point in imageing sensor 102 in real time,
And this position is mapped to projector 101 shows the mouse position of picture, realize generation by the light on and off of light pen luminous point
Function for computer mouse manipulation main frame 104.But, at the picture 105 that imageing sensor 102 photographs
In, the imagery zone 106 of projector 101 projection only occupies a portion, and the most a lot of regions are environment
Background.Therefore, other regions shield beyond imagery zone 106 would generally only be detected and respond by main frame 104
Luminous point within imagery zone 106 scope.
It is said that in general, electronic whiteboard by judge the size of speck whether more than a certain thresholding T judge light pen or
Person is whether the finger of user is being write.But, there may be the brightness interference light more than thresholding T in the environment
Source, even if using shielding picture to shield environmental background thus only retaining imagery zone, jamming light source still may be deposited
In being imagery zone, real light pen hot spot cannot normally be write to cause electronic whiteboard correctly to identify.
Summary of the invention
The technical problem to be solved in the present invention is to provide the interference crawl of a kind of electronic whiteboard based on imageing sensor
State screen method and device, it is possible to the noise spot in dynamic barrier imagery zone.
For solving above-mentioned technical problem, the invention provides the interference of a kind of electronic whiteboard based on imageing sensor
The dynamic screen method of point, described electronic whiteboard be configured to display device with the use of, described display device for
Presenting display image on display plane, described electronic whiteboard includes:
For shooting the imageing sensor of described display plane, the picture that described imageing sensor photographs includes shadow
As region and the shielding area in addition to described imagery zone；
The control parts being connected with described display device and imageing sensor, for positioning in described imagery zone
Control hot spot；
Described noise spot dynamic barrier method includes:
The continuous multiple frames picture of imageing sensor shooting described in detecting real-time；
Search for described imagery zone inner area and less than preset area thresholding and be continued above Preset Time at same position
Speck；
To add to described shielding area with this speck same position, region of the same area.
According to one embodiment of present invention, described method also includes: if there is area in described imagery zone
More than the speck of described preset area thresholding, then there is strong interference in prompting user.
According to one embodiment of present invention, search for described imagery zone inner area less than preset area thresholding and
Same position is continued above the speck of Preset Time and includes:
For the first frame picture detected, each hot spot record detected in described imagery zone is being recorded number
In group, recorded content includes the position of hot spot, area and goes out now for the first time；
For follow-up each frame picture, by the hot spot detected in described imagery zone and described record array
The hot spot of record compares, if in the first facula position newly detected and described record array existing second
Facula position is identical, then be retained in described record array by this second hot spot；If described record array is remembered
3rd hot spot of record does not mates with any facula position currently detected, then by the 3rd hot spot from described record
Array is deleted；If the position of any hot spot recorded in the 4th hot spot currently detected and described record array
Put and the most do not mate, then the 4th hot spot is inserted in described record array；
Search in described record array to go out to exceed the speck of described Preset Time away from the present now for the first time.
Present invention also offers the noise spot dynamic barrier device of a kind of electronic whiteboard based on imageing sensor, institute
State electronic whiteboard to be configured to display device with the use of, described display device for presenting display on display plane
Image, described electronic whiteboard includes:
For shooting the imageing sensor of described display plane, the picture that described imageing sensor photographs includes shadow
As region and the shielding area in addition to described imagery zone；
The control parts being connected with described display device and imageing sensor, for positioning in described imagery zone
Control hot spot；
Described noise spot dynamic barrier device includes:
Picture detecting module, the continuous multiple frames picture of imageing sensor shooting described in detecting real-time；
Speck search module, searches for described imagery zone inner area and less than preset area thresholding and holds at same position
The continuous speck exceeding Preset Time；
Speck shroud module, will add to described shielding area with this speck same position, region of the same area.
According to one embodiment of present invention, described noise spot dynamic barrier device also includes:
, if there is the area speck more than described preset area thresholding in described imagery zone, then in reminding module
There is strong interference in prompting user.
According to one embodiment of present invention, described speck search module includes:
Array maintenance unit, for the first frame picture detected, each light that will detect in described imagery zone
Speckle record is in record array, and recorded content includes the position of hot spot, area and goes out now for the first time；For rear
Continuous each frame picture, enters the hot spot detected in described imagery zone with the hot spot of record in described record array
Row compare, if the first facula position newly detected with described record array existing second facula position phase
With, then this second hot spot is retained in described record array；If the 3rd light recorded in described record array
Speckle does not mates with any facula position currently detected, then deleted from described record array by the 3rd hot spot
Remove；If the position of any hot spot recorded in the 4th hot spot currently detected and described record array is the most not
Join, then the 4th hot spot is inserted in described record array；
Search unit, searches in described record array to go out to exceed the bright of described Preset Time away from the present now for the first time
Speckle.
Compared with prior art, the invention have the advantages that
The noise spot dynamic barrier method of the embodiment of the present invention, the gamma value at imageing sensor is conventional value state
Under, the continuous multiple frames picture that detecting real-time imageing sensor photographs, it is less than if there is area in imagery zone
The speck of preset area thresholding, and this speck is continued above Preset Time at same position, then will be with this speck phase
Co-located, region of the same area are added to shielding area, thus the interference that dynamically will occur during electronic whiteboard
Point shielding.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of electronic whiteboard based on imageing sensor in prior art；
Fig. 2 is the noise spot dynamic barrier method of the electronic whiteboard based on imageing sensor of the embodiment of the present invention
Schematic flow sheet；
Fig. 3 shows the schematic flow sheet of the static mask process of the embodiment of the present invention；
Fig. 4 shows the schematic flow sheet of the dynamic barrier process of the embodiment of the present invention；
Fig. 5 to Fig. 8 shows that in the noise spot dynamic barrier method of the embodiment of the present invention, imageing sensor is in each step
Suddenly the picture view photographed；
Fig. 9 is the structured flowchart of the noise spot dynamic barrier device of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, the invention will be further described, but should not limit this with this
Bright protection domain.
In the present embodiment, electronic whiteboard based on imageing sensor generally is configurable to coordinate with display device make
With, this display device presents display image on display plane, and this electronic whiteboard includes: be used for shooting described display
The imageing sensor of plane, the picture that this imageing sensor photographs includes beyond imagery zone and imagery zone
Shielding area；The control parts being connected with display device and imageing sensor, the only control in the imagery zone of location
Hot spot, and the operation in the shielding area beyond imagery zone is not responded.
Wherein, display device can be various liquid crystal (LCD) screen, light emitting diode (LED) screen, etc. from
Sub-display or projector etc..Imageing sensor can use the photographic head of various routine to realize, the most permissible
Being various types of imageing sensor such as CCD, CMOS, its resolution can be such as 640*480, but also
It is not limited to this.Control parts can be personal computer (computer), special controller or use able to programme firmly
Part or special IC etc. realize.It addition, this electronic whiteboard can also include infrared light pen, light film or for producing
The equipment such as the parts of third contact of a total solar or lunar eclipse film.
Such as, this electronic whiteboard can be the electronic whiteboard described in background technology, or in background technology
Electronic whiteboard in cited patent.
As a nonrestrictive example, imagery zone can determine in the following way: drives display to set
Standby first color that is displayed in full screen on display plane, the picture of driving optical pickocff shooting display plane, and by it
Save as the first picture；Drive display device to be displayed in full screen the second color on display plane, drive optical pickocff
The picture of shooting display plane, and is saved as second picture, and the second color has different bright from the first color
Degree；First picture and second picture are converted to gray scale picture, generate the first picture and the second gray scale picture respectively；
First gray scale picture and the second gray scale picture are carried out calculus of differences, obtains difference picture；By pixel in difference picture
Value is object pixel more than or equal to the pixel placement of pre-determined threshold, and the region with the presence of continuous print object pixel is defined as
Target area；Area is eliminated less than the target area of preset area；Reservation face is selected in remaining target area
One of long-pending maximum is defined as imagery zone；Fill up the cavity within imagery zone.Picture in imageing sensor shooting
In face, other regions beyond imagery zone then may determine that as being shielding area.
With reference to Fig. 2, the noise spot dynamic barrier method of the present embodiment electronic whiteboard based on imageing sensor include with
Lower step:
Step S21, the continuous multiple frames picture of imageing sensor shooting described in detecting real-time；
Step S22, searches for described imagery zone inner area and less than preset area thresholding and is continued above at same position
The speck of Preset Time；
Step S23, will add to described shielding area with this speck same position, region of the same area.
Furthermore, step S22 specifically includes: safeguard record array A, draws for the first frame detected
Face, by each hot spot record of detecting in imagery zone in record array A, the content of record includes hot spot
Position, area and first time go out now；For follow-up each frame picture, the light that will detect in imagery zone
Speckle compares with the hot spot of record in record array A, if the first facula position newly detected and record number
In group A, existing second facula position is identical, then be retained in by this second hot spot in record array A；If note
In record array A, the 3rd hot spot that recorded does not mates with any facula position currently detected, then by this
Three hot spots are deleted from record array A；If the 4th hot spot currently detected and record in record array A
The position of any hot spot do not mate, then the 4th hot spot is inserted in record array A；Safeguarding record number
While group, going out to exceed the speck of Preset Time away from the present now for the first time in search record array, this speck is recognized
For being noise spot, follow-up will with this speck same position, region of the same area add to shielding area.
Wherein, preset area thresholding can be that user is set in advance according to practical situation, and it is typically with pixel
For unit, such as, can be 40 pixels.Preset Time is also that user is set in advance according to practical situation,
It can be such as 15 seconds.Detect there is area in imagery zone more than the speck of preset area thresholding time, also
User can be pointed out to there is strong interference.
Above-mentioned whole dynamic barrier process is to carry out in real time, whole process with the normal work of electronic whiteboard
The normal display parameters of electronic whiteboard can't be impacted.Additionally, when electronic whiteboard just starts, or by
The instruction triggers that user sends, it is also possible to carry out the static mask of noise spot, static mask specifically can include following
Step:
Step a, drives described display device to be displayed in full screen detection background on described display plane, and described detection is carried on the back
The brightness of scape is less than the brightness of described control hot spot；
Step b, drives described imageing sensor to shoot the detection background of display on described display plane；
Step c, is analyzed the imagery zone in described imageing sensor shooting picture, by brightness more than presetting
The interference region of luminance threshold adds to described shielding area.
In step a, it is also possible to the gamma value of imageing sensor is turned down simultaneously, so that potential noise spot
Can be easier to come out.It should be noted that " turning down " is relative concept herein, not refer in particular to a certain really
Fixed scope, refers specifically to regulate the gamma value of imageing sensor so that it is scheme when normally working less than electronic whiteboard
Conventional value as sensor gamma value.
In step c, predetermined luminance thresholding can be generally the brightness upper limit controlling hot spot, when the most normally using,
The high-high brightness of the hot spot of light pen or the high-high brightness of finger flare.
Static mask is directed in electronic whiteboard working environment some interference sources of static existence, at static mask
During be prohibited from user and use light pen to carry out operating, do not have in i.e. supposing imagery zone and control light normally
Speckle.
This static mask process can electronic whiteboard start initialize time carry out, it is also possible to be upon actuation by with
The instruction triggers at family and carry out.Owing to, in actual application scenarios, interference hot spot is probably and is not stopping flicker,
The brightness and the size that thus interfere with region are continually changing, therefore during a static mask, and interference range
Territory likely, the state of area minimum the darkest just at brightness, causes the shielding area added than actual interference
Area size is little, it is impossible to enough shield noise spot for a full due.Given this situation is planted, in a preferred embodiment,
During a static mask, step b and many times of c can be repeated, to guarantee fully, fully will be dry
Disturb a shielding.
Below with reference to Fig. 3 and Fig. 4, use an example that above-mentioned noise spot dynamic barrier method is described in detail.
First combine Fig. 3, Fig. 5 and Fig. 6, at step S301, start static mask, such as, can be electricity
When sub-blank starts, or start when user's manual operation starts static mask function.
Afterwards at step S302, display device shows full frame highlighted background, and number of processes accumulator K is multiple
Zero.Wherein, the brightness of highlighted background needs less than the brightness controlling hot spot.In this step, it is also possible to by image
The gamma value of sensor is turned down, in order to expose potential whole interference sources.
At step S303, in imagery zone 51, search for the brightness interference region more than predetermined luminance thresholding T
52。
Perform step S304 afterwards, the area of the interference region 52 found is judged, if greater than default face
Long-pending thresholding S, then jump to step S309, and prompting user exists severe jamming, forbids that light pen operates, and and then
Advance to step S310, exit this static mask process.
If the judged result at step S304 is no, then performs step S305, interference region 52 is added to
In original shielding area 50.In actual use, the bitmap of shielding area can be clapped in real time with imageing sensor
The picture taken the photograph does logic and operation, realizes function of shielding with this.
Performing step S306 afterwards, the value of number of processes accumulator K is incremented by 1.Next step S307 is performed,
Judge that K, whether more than needing number of times upper limit N to be processed, if it is, represent and be finished, advances to
Step S308, exits static mask；Otherwise represent and be also not carried out complete, be back to step S303, continually look for
Interference region.
Combine Fig. 4, Fig. 7 and Fig. 8 afterwards dynamic barrier process is described in detail.
After static mask terminates, the gamma value of imageing sensor can be returned to conventional value, electronic whiteboard is opened
Begin normally to use, i.e. allow user to use light pen or other instruments to operate.The most worked at electronic whiteboard
Cheng Zhong, carries out the operation of dynamic barrier in real time.
At step S401, dynamic barrier starts.
At step S402, record array A is emptied, by the match flag set of the most each element units
FALSE。
Perform step S403, the hot spot 53 in detecting real-time imagery zone afterwards, result is saved as list B.
Perform step S404 afterwards, it is judged that whether list B exists the area hot spot more than thresholding area S, as
Fruit is, then go to step S409, and prompting user exists strong interference, and then advances to step S410, terminates.
If the judged result in step S404 is no, then advance to step S405, each by list B
Element carries out position relevant matches, if the match is successful, then it represents that this position with the element in record array A
Hot spot sustainable existence, is set to TRUE, and general by the match flag of element units corresponding in record array A
The luminous point joined removes from list B.
Perform step S406 afterwards, the element units of match flag position FALSE in record array A is removed.
Next perform step S407, element units remaining in list B is added to record as new hot spot
In array A, and record the information such as the moment of generation, position, area.
At step S408, find the hot spot 53 away from the current moment more than 15s preserved in record array A,
The region identical with hot spot 53 position, area is added to shielding area 50, is back to step S403 afterwards,
Proceed detecting.
It should be noted that above is only a nonrestrictive example, can also use in other embodiments
Following manner carries out dynamic barrier: set up array A, for recording the position of hot spot, size and occurring for the first time
Moment；For the first time during shielding dynamic operations, by position, the size of the hot spot detected and go out record now
In array A；When second time shielding dynamic operations, facula position and the record in array A that will be newly detected
Facula position mate, if there is the hot spot that position is identical, be then retained in array A；If
The facula position of a certain unit record in array A does not mates, then with currently detected any facula position
This data cell is deleted；If the position of any data cell in the hot spot being newly detected and data A is the most not
Coupling, then go out to be inserted in array A by the position of this hot spot, area, first time now；And so forth,
If the hot spot of record has more than Preset Time (such as 15s) in array A, and its area is less than preset area
Thresholding, then will add in shielding area with this facula position, region that area is identical, thus by this interference hot spot
Shielding.If it find that there is facula area to be more than preset area thresholding, duty prompting user's serious interference, and disable light pen
Operation.
In example discussed above, dynamic barrier and static mask are used in combination, but art technology
Personnel should be appreciated that above-described dynamic barrier method can also individually be implemented, i.e. does not perform static mask
And individually perform dynamic barrier.Such as, do not carry out static mask when electronic whiteboard is started shooting, be only white at electronics
With performing dynamic barrier in plate course of normal operation.
With reference to Fig. 9, the noise spot dynamic barrier device of the present embodiment includes that picture detecting module 51, speck are searched for
Module 52, speck shroud module 53, reminding module 54.
Wherein, the continuous multiple frames picture of picture detecting module 51 detecting real-time imageing sensor shooting；Speck is searched for
Module 52 is searched for imagery zone inner area and less than preset area thresholding and is continued above Preset Time at same position
Speck；Speck shroud module 53 will add to described blind zone with this speck same position, region of the same area
Territory；If there are the area speck more than described preset area thresholding, then reminding module 54 in described imagery zone
There is strong interference in prompting user.
Furthermore, speck search module 52 can include array maintenance unit and search unit.Array is safeguarded
The each hot spot record detected in described imagery zone, for the first frame picture detected, is being recorded array by unit
In, recorded content includes the position of hot spot, area and goes out now for the first time；For follow-up each frame picture,
The hot spot detected in described imagery zone is compared, if newly detectd with the hot spot of record in described record array
The first facula position measured is identical with existing second facula position in described record array, then by this second hot spot
It is retained in described record array；If the 3rd hot spot recorded in described record array and appointing of currently detecting
What facula position does not mates, then deleted from described record array by the 3rd hot spot；If currently detected
4th hot spot does not mates with the position of any hot spot recorded in described record array, then inserted by the 4th hot spot
Enter in described record array；Search unit is searched in described record array to go out to exceed described pre-away from the present now for the first time
If the speck of time.
More detailed work process about the noise spot dynamic barrier device shown in Fig. 9 may refer to earlier figures 2
To Fig. 8 and associated description, repeat no more here.
Device shown in Fig. 9 can realize in the way of using software program, or can also use programmable hardware
Or the mode of special IC (ASIC) realizes.This device can be integrated in display device, such as
The mode using special IC is integrated in projector；The mode that can also use software program is integrated in electronics
In main frame 104 in blank (Fig. 1).
Although the present invention is open as above with preferred embodiment, but it is not for limiting the present invention, Ren Heben
Skilled person without departing from the spirit and scope of the present invention, can make possible variation and repair
Changing, therefore protection scope of the present invention should be defined in the range of standard with the claims in the present invention.
Claims (6)
1. a noise spot dynamic barrier method for electronic whiteboard based on imageing sensor, described electronic whiteboard is joined
It is set to display device with the use of, described display device for presenting display image, described electricity on display plane
Sub-blank includes:
For shooting the imageing sensor of described display plane, the picture that described imageing sensor photographs includes shadow
As region and the shielding area in addition to described imagery zone；
The control parts being connected with described display device and imageing sensor, for positioning in described imagery zone
Control hot spot；
It is characterized in that, described noise spot dynamic barrier method includes:
The continuous multiple frames picture of imageing sensor shooting described in detecting real-time；
Search for described imagery zone inner area and less than preset area thresholding and be continued above Preset Time at same position
Speck；
To add to described shielding area with this speck same position, region of the same area.
Noise spot dynamic barrier method the most according to claim 1, it is characterised in that also include: if
There is the area speck more than described preset area thresholding in described imagery zone, then prompting user exists strong dry
Disturb.
Noise spot dynamic barrier method the most according to claim 1, it is characterised in that search for described image
Region inner area is less than preset area thresholding and is continued above the speck of Preset Time at same position and includes:
For the first frame picture detected, each hot spot record detected in described imagery zone is being recorded number
In group, recorded content includes the position of hot spot, area and goes out now for the first time；
For follow-up each frame picture, by the hot spot detected in described imagery zone and described record array
The hot spot of record compares, if in the first facula position newly detected and described record array existing second
Facula position is identical, then be retained in described record array by this second hot spot；If described record array is remembered
3rd hot spot of record does not mates with any facula position currently detected, then by the 3rd hot spot from described record
Array is deleted；If the position of any hot spot recorded in the 4th hot spot currently detected and described record array
Put and the most do not mate, then the 4th hot spot is inserted in described record array；
Search in described record array to go out to exceed the speck of described Preset Time away from the present now for the first time.
4. a noise spot dynamic barrier device for electronic whiteboard based on imageing sensor, described electronic whiteboard is joined
It is set to display device with the use of, described display device for presenting display image, described electricity on display plane
Sub-blank includes:
For shooting the imageing sensor of described display plane, the picture that described imageing sensor photographs includes shadow
As region and the shielding area in addition to described imagery zone；
The control parts being connected with described display device and imageing sensor, for positioning in described imagery zone
Control hot spot；
It is characterized in that, described noise spot dynamic barrier device includes:
Picture detecting module, the continuous multiple frames picture of imageing sensor shooting described in detecting real-time；
Speck search module, searches for described imagery zone inner area and less than preset area thresholding and holds at same position
The continuous speck exceeding Preset Time；
Speck shroud module, will add to described shielding area with this speck same position, region of the same area.
Noise spot dynamic barrier device the most according to claim 4, it is characterised in that also include:
, if there is the area speck more than described preset area thresholding in described imagery zone, then in reminding module
There is strong interference in prompting user.
Noise spot dynamic barrier device the most according to claim 4, it is characterised in that described speck is searched for
Module includes:
Array maintenance unit, for the first frame picture detected, each light that will detect in described imagery zone
Speckle record is in record array, and recorded content includes the position of hot spot, area and goes out now for the first time；For rear
Continuous each frame picture, enters the hot spot detected in described imagery zone with the hot spot of record in described record array
Row compare, if the first facula position newly detected with described record array existing second facula position phase
With, then this second hot spot is retained in described record array；If the 3rd light recorded in described record array
Speckle does not mates with any facula position currently detected, then deleted from described record array by the 3rd hot spot
Remove；If the position of any hot spot recorded in the 4th hot spot currently detected and described record array is the most not
Join, then the 4th hot spot is inserted in described record array；
Search unit, searches in described record array to go out to exceed the bright of described Preset Time away from the present now for the first time
Speckle.
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| CN201210507699.1A CN103019473B (en) | 2012-11-30 | 2012-11-30 | The noise spot dynamic barrier method and device of electronic whiteboard based on imageing sensor |
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| CN101882032A (en) * | 2010-07-02 | 2010-11-10 | 廖明忠 | Handwriting input method, device and system and receiver |
| CN102043541A (en) * | 2009-10-14 | 2011-05-04 | 谭登峰 | General optical touch screen |
| CN102063230A (en) * | 2011-01-05 | 2011-05-18 | 福州锐达数码科技有限公司 | Optical imaging touch sensing system and imaging method |
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| JP5560722B2 (en) * | 2010-01-12 | 2014-07-30 | セイコーエプソン株式会社 | Image processing apparatus, image display system, and image processing method |
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|---|---|---|---|---|
| CN102043541A (en) * | 2009-10-14 | 2011-05-04 | 谭登峰 | General optical touch screen |
| CN101882032A (en) * | 2010-07-02 | 2010-11-10 | 廖明忠 | Handwriting input method, device and system and receiver |
| CN102063230A (en) * | 2011-01-05 | 2011-05-18 | 福州锐达数码科技有限公司 | Optical imaging touch sensing system and imaging method |
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