CN101833398A - Position detecting device and method thereof - Google Patents
Position detecting device and method thereof Download PDFInfo
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- CN101833398A CN101833398A CN200910008782A CN200910008782A CN101833398A CN 101833398 A CN101833398 A CN 101833398A CN 200910008782 A CN200910008782 A CN 200910008782A CN 200910008782 A CN200910008782 A CN 200910008782A CN 101833398 A CN101833398 A CN 101833398A
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Abstract
The invention discloses a position detecting device. The device comprises a frame, a plurality of image capturing units and a processing unit, wherein the frame limits a spatial scope; the image capturing units are arranged on the frame respectively; each of the image capturing units is used for capturing a position image in the spatial scope; the processing unit is coupled to the image capturing units; and when an object to be detected is placed at a special position in the spatial scope, the processing unit can determine the special position of the objected to be detected according to each position image. The invention also discloses a position detecting device. The method is used for determining the special position of at least one object to be detected on a plane object and comprises the following steps of: arranging the plurality of image capturing units at the periphery of the plane object; capturing the position image for the object to be detected by each of the image capturing units, wherein the position image records the correlation between the special position and the surface position of the plane object; and determining the special position of the object to be detected according to each position image.
Description
Technical field
The present invention relates to a kind of arrangement for detecting, refer to a kind of position detecting apparatus and method thereof especially.
Background technology
In recent years, the application of touch panel (Touch Panel) is more and more extensive, for example personal digital assistant device (Personal Digital Assistant), visitor's guide system, ATM (Automatic Teller Machine), point-of-sale terminals etc.And touch panel can be divided into kinds such as electric resistance touch-control panel, capacitance type touch-control panel and infrared-type touch panel according to the difference of its operation technique at present.
With capacitance type touch-control panel, main way is to plate conductive materials such as antimony tin film (ATO Film) and silver slurry line on glass plate, and the outside is covered with scratch resistant filming again.Electrode around the glass plate can produce uniform low voltage electric field on the conductive layer of the outside.Inner conductive layer then can provide electromagnetic screen, and reducing noise.When finger touches screen, will produce capacitive coupling with the electric field on the conductive layer of the outside, remove small electric current and inhale, be responsible for measuring the coordinate of making finger from the size of current in each corner by each electrode.The advantage of capacitance type touch-control panel is that stability is high, penetrability is good, skin hardness is strong, but shortcoming to be price higher and processing procedure is comparatively complicated.
For electric resistance touch-control panel, mainly be to see through tin indium oxide conductive film (ITO Film) and a slice indium tin oxide-coated glass (ITO Glass) and form, between electro-conductive glass and the conductive film, then the small separation made from one deck polyester separates.Along the X-axis of glass, and the Y-axis of conductive film, a controller is respectively arranged, can apply small voltage gradient.Whenever finger touches panel, will be together two conductive lamination, and then detect the X coordinate and the Y coordinate of contact.The advantage of electric resistance touch-control panel is that manufacturing cost is lower, structure is simpler and easy, but penetrability and skin hardness all are worse than capacitance type touch-control panel.
Infrared-type touch panel then utilizes light source blocking principle, around indicator screen, settle infrared and receiving trap, when the object contact screen, will interdict light signal, record the coordinate of object on screen by the received signal of analyzing receiving trap.As the TaiWan, China patent publication No. be 200805123 disclosed " position detecting apparatus ", promptly be to utilize the infrared ray principle to detect ad-hoc location.Please refer to Fig. 1, this figure is the outward appearance configuration diagram of a specific embodiment of existing position detecting apparatus.As shown in Figure 1, position detecting apparatus 1 comprises a framework 11, infrared light sources 131,133,135,137 and light receiver 132,134,136,138.Wherein, infrared light sources 131,133,135,137 and light receiver 132,134,136,138 are arranged on the framework 11, and light receiver 132,134,136,138 is used for receiving infrared-ray light source 131,133,135,137 light of being launched.
Specifically, when placing certain position in framework 11 of a determinand 15, will block infrared light sources 131,133,135 light signals of being launched, and make light receiver partly 132,134,136,138 received light signal strengths reduce.Analyze each light receiver 132,134,136,138 light signal strength that received by the processor (not shown), and according to the position of each light receiver 132,134,136,138 and the Strength Changes of institute's receiving optical signals thereof, and the position of decision determinand 15 in framework 11.By finding out among Fig. 1, formed four groups of online confluces can determine the position of determinand 15 in framework 11 between light receiver 132,134,136,138 and each infrared light sources 131,133,135.
Summary of the invention
The object of the present invention is to provide a kind of position detecting apparatus and method for detecting thereof, it utilizes the image of each angle in acquisition screen the place ahead, and the variation of analyzing every image calculates the position of object striking screen, with the position of energy detecting real-time Touch Screen.
The present invention discloses a kind of position detecting apparatus, and it includes a framework, a plurality of image acquisition unit and a processing unit.Described framework limits a spatial dimension; Image acquisition unit is arranged at respectively on the framework, and each image acquisition unit is in order to the position images in the acquisition spatial dimension; Processing unit is coupled to image acquisition unit; Wherein, when a determinand placed an ad-hoc location of spatial dimension, processing unit can decide the ad-hoc location of determinand according to each position images.
The present invention discloses a kind of position detection method again, is positioned at the ad-hoc location on the planar object in order to determine at least one determinand.The step of described position detection method is as follows: at first, the periphery on this planar object is provided with a plurality of image acquisition units; Come, each image acquisition unit captures a position images to determinand respectively again, and wherein position images records the relativeness of the surface location of ad-hoc location and planar object; At last, decide the ad-hoc location of determinand according to each position images.
By the aforementioned techniques scheme, the present invention is provided with a plurality of Image sensor apparatus around screen, utilizes its mode that respectively the screen sensing image is changed to estimate the physical location of Touch Screen, so can in real time, correctly detect the touch-control coordinate.
Above general introduction and ensuing detailed description and accompanying drawing all are to reach mode, means and the effect that predetermined purpose is taked in order to further specify the present invention.And relevant other purpose of the present invention and advantage will be set forth in follow-up explanation and accompanying drawing.
Description of drawings
Fig. 1 is the outward appearance configuration diagram of a specific embodiment of existing position detecting apparatus;
Fig. 2 is the outward appearance configuration diagram of a specific embodiment of disclosed position detecting apparatus;
Fig. 3 is the system architecture synoptic diagram of a specific embodiment of disclosed position detecting apparatus;
Fig. 4 is the operation chart of a specific embodiment of disclosed position detecting apparatus;
Fig. 5 is a specific embodiment synoptic diagram of disclosed position images;
Fig. 6 is a specific embodiment synoptic diagram of disclosed sample point;
Fig. 7 is a specific embodiment synoptic diagram of disclosed correspondence table; And
Fig. 8 is the flow chart of steps of a specific embodiment of disclosed position detection method.
[main element description of reference numerals]
Existing
1: position detecting apparatus
11: framework
111: screen
131,133,135,137: infrared light sources
132,134,136,138: light receiver
15: determinand
The present invention
2: position detecting apparatus
21: framework
211: spatial dimension
231～238: image acquisition unit
25: processing unit
27: frequency generator
29: buffer unit
31: planar object
32: shield
33,35: determinand
L1, L2: ad-hoc location
I1～I8: position images
S1～S25: sample point
S801～S809: each steps flow chart
Embodiment
Position detecting apparatus proposed by the invention and method for detecting thereof, be before device dispatches from the factory, set up the corresponding relation of distance between the surface location of screen and its peripheral image acquisition unit in advance, when arbitrary object striking screen, image on the image acquisition unit meeting sensing screen changes, and by analyzing each image, to estimate the physical location of object Touch Screen with reference to the corresponding relation of above-mentioned prior foundation.
Major technique of the present invention is characterised in that at the screen periphery image capture unit is set, and change the position coordinates of judging the striking screen by the image on the sensing screen, below necessary inside and outside system architecture and motion flow thereof are just only proposed, yet, those skilled in the art learn that except following mentioned member, the electronic installation of display screen and collocation thereof comprises other necessary element certainly, therefore, should not exceed with the content that present embodiment discloses.
At first, see also Fig. 2, this figure is the outward appearance configuration diagram of a specific embodiment of disclosed position detecting apparatus.As shown in Figure 2, position detecting apparatus 2 comprises a framework 21 and a plurality of image acquisition unit 231～238.Crossed a spatial dimension 211 in the framework 2, and image acquisition unit 231～238 is arranged at respectively on the framework 21, in order to the image in the acquisition spatial dimension 211.Specifically, image acquisition unit 231～238 faces the center of spatial dimension 211, and is arranged at fifty-fifty on the framework 21.Image acquisition unit 231～238 is one or its combination of CMOS image sensor protecting low temperature oxide delamination (Complementary Metal Oxide SemiconductorSensor, CMOS Sensor) or digital camera.
What deserves to be mentioned is that the quantity of described image acquisition unit is a plurality of, in the present embodiment be with eight be example, yet do not exceed with the content that discloses.
Then, please in the lump with reference to figure 3, this figure is the system architecture synoptic diagram of a specific embodiment of disclosed position detecting apparatus.As shown in Figure 3, position detecting apparatus 2 more comprises a processing unit 25, a frequency generator 27 and a buffer unit 29.Processing unit 25 is coupled to image acquisition unit 231～238, in order to handle its picked image; Frequency generator 27 is coupled to this image acquisition unit 231～238, comes periodically pick-up image in order to control image acquisition unit 231～238 with a specific period; 29 of buffer units are to be used for storing institute's picked image.
In order more to understand operation aspect of the present invention, please refer to Fig. 4, this figure is the operation chart of a specific embodiment of disclosed position detecting apparatus.As shown in Figure 4, framework 21 collocation one planar object 31 of position detecting apparatus 2 uses, and framework 21 is provided with thereon around this planar object 31, to define spatial dimension 211 on planar object 31.Specifically, described planar object 31 is the display screen of a calculator system, as user during by the ad-hoc location in the spatial dimension 211 of determinand 33,35 contact (or approaching) these planar object 31 tops, the image that image acquisition unit 231～238 senses in the spatial dimension 211 immediately changes, just facing to the direction of determinand 33,35 acquisition position images, wherein this position images records the relativeness of the surface location of the ad-hoc location at determinand 33,35 places and planar object 31; At last, processing unit 25 just can calculate the ad-hoc location of the reality of determinand 33,35 according to the position images of each image acquisition unit acquisition.Specifically, one of them of finger that determinand 33,35 can the person of being to use or pen.
In a specific embodiment of the present invention, position detecting apparatus 2 more comprises a shield 32, framework 21 can be arranged between planar object 31 and the shield 32, to reduce the size of this spatial dimension 211 of image acquisition unit 231～238 sensings, and then when avoiding the outer images of spatial dimension 211 to change, just drive image acquisition unit 231～238 acquisition position images.
Please in the lump with reference to figure 5, this figure is a specific embodiment synoptic diagram of disclosed position images.As shown in Figure 5, place ad-hoc location L1 with determinand 33, its coordinate is (X1, Y1), and determinand 35 places ad-hoc location L2, its coordinate is (X2, Y2) be example, each image acquisition unit 231～238 is in the two ad-hoc location L1 that different azimuth is seen, the image of L2 is all inequality, the position images I1 that image acquisition unit 231 captures has just write down two determinands 33, the relativeness of the surface location of 35 position and planar object 31, remaining image acquisition unit 232～238 has also captured the position images I2 that direction sensed separately～I8 (not shown), to write down two determinands 33 respectively, 35 distances with respect to each image acquisition unit 232～238.Thus, processing unit 25 just can utilize the positional information that writes down among eight tension position image I1～I8, calculates the coordinate of two ad-hoc location L1, L2.
What deserves to be mentioned is that the corresponding relation between position detecting apparatus 2 must be set up planar object 31 earlier before dispatching from the factory surface location and the image acquisition unit 231～238 calculates determinand with the correction position image and cuts true ad-hoc location.The mode of setting up corresponding relation can have a variety of, in one specific embodiment, as shown in Figure 6, on planar object 31, click a plurality of sample point S1～S25, sample point Si of every click, all image acquisition units be just respectively to the same this position image of this sample point Si acquisition, with the relativeness of the surface location of the position of writing down this sample point Si and this planar object 31, write down the sample position at sample point Si and place thereof by processing unit 25 more at last, information such as sample position image produce the form of expression corresponding relation, as shown in Figure 7, be example with sample point S1, the sample position of supposing its place is (0,0), then the represented relative position of sample position image that senses sample point S1 from each image acquisition unit 231～238 is (0,0,0,0.5,1,1,1,0.5), other sample point is also by that analogy.
The correspondence table 7 that Fig. 7 has been arranged just can calculate the position that is positioned at determinand 33,35 on the planar object 31.Position with determinand 33 is L1[0.32,0.78], the position of determinand 35 is L2[0.86,0.19] for example, the numerical value that the position images of 231～238 pairs of determinands of image acquisition unit, 33 acquisitions is changed out is V
L1[0.32,0.55,0.78,0.73,0.68,0.45,0.22,0.27], processing unit 25 can be with V
L1The numerical value I that goes out with each sample position video conversion one by one
SiCarry out computing,, be sample point S17 to find out the nearest sample point Si of at least one and determinand 33.And then proofread and correct V according to the distance that the sample position image of sample point S17 calculates sample point S17 and determinand 33
L1, as formula (1), and utilize the sample position of the range difference calculate and sample point S17 to calculate determinand 33 and cut true ad-hoc location L1, as formula (2); The ad-hoc location L2 of determinand 35 calculates in an identical manner.Thus, even on planar object 31, click a plurality of positions, the position images that processing unit 25 still can utilize image acquisition unit to capture, and see through the correction of correspondence table 7, estimate the physical location of each determinand.
Δ L1=Calibrate (V
L1, 17, { I
Si) ... ... ... ... ... ... formula (1)
＝[V
L1(1)-I
S17(1)V
L1(3)-I
S17(3)]＝[0.32-0.250.78-0.75]＝[0.07?0.03]
L1=L
S17+ Δ L1................................................ formula (2)
＝[0.25+0.07?0.75+0.03]＝[0.32?0.78]
In a specific embodiment of the present invention, the variation of method image on utilizing sense plane object 31 of acquisition position images, also can utilize frequency generator 27 control image acquisition units 231～238 periodically to capture the position images of different angles with specific period, therefore, buffer unit 29 can store the position images and the preceding position images that is captured of last this specific period of up-to-date acquisition simultaneously, the real-time position images that is captured by above-mentioned two time points of processing unit 25 comparisons, and decide the ad-hoc location of determinand according to both difference.
At last, see also Fig. 8, this figure is the flow chart of steps of a specific embodiment of disclosed position detection method.Wherein Xiang Guan system architecture is please consulted Fig. 2 to Fig. 7 simultaneously.As shown in Figure 8, described position detection method is following steps:
At first, use determinand 33,35 on planar object 31, to click ad-hoc location L1, L2 (step S801) respectively; Then, each image acquisition unit 231～238 is just to the position images of determinand 33,35 acquisition different azimuth, and according to the relativeness of the surface location of ad-hoc location L1, L2 and planar object 31 and ratio with position images quantification (step S803);
Come the numerical value I that processing unit 25 can go out with each sample position video conversion one by one with the position images after quantizing again
SiCarry out computing, to find out the sample point Si (step S805) nearest with determinand; After learning sample point Si, processing unit 25 just can be found the sample position image of sample position and quantification from correspondence table 7, and utilizes the position images (step S807) after formula (1) is proofreaied and correct quantification; At last, processing unit 25 utilizes position images after formula (1) will be proofreaied and correct to calculate ad-hoc location L1, the L2 (step S809) of determinand 33,35 again.
Describing in detail by above example, when knowing position detecting apparatus of the present invention and method for detecting thereof, is the image that utilizes each angle on the sensing screen, and the variation of analyzing every image calculates the position coordinates of object striking screen.Thus, can reduce existing electric resistance touch-control panel, the cost of capacitance type touch-control panel on circuit design, and reduce the easily disappearance of error of its detecting position.And, utilize image acquisition unit to sense the image in each orientation, and see through the correction of correspondence table, can reach with the time and detect a plurality of strikings position, and then more polynary control model is provided.
But; the above; only be the detailed description and the accompanying drawing of specific embodiments of the invention; be not in order to restriction the present invention; protection scope of the present invention should be as the criterion with the scope of claims; any those skilled in the art in the field of the invention, can think easily and variation or modify all can be encompassed within the protection domain that this case defines.
Claims (18)
1. a position detecting apparatus is characterized in that, includes:
One framework, it limits a spatial dimension;
A plurality of image acquisition units are arranged at respectively on this framework, and each this image acquisition unit is in order to capture the position images in this spatial dimension; And
One processing unit is coupled to these image acquisition units;
Wherein, when at least one determinand placed an ad-hoc location of this spatial dimension, this processing unit decided this ad-hoc location of this determinand according to each this position images.
2. position detecting apparatus as claimed in claim 1 is characterized in that, when the image of this image acquisition unit in this spatial dimension changes, and these position images of beginning acquisition.
3. position detecting apparatus as claimed in claim 1 is characterized in that, more includes:
One frequency generator is coupled to this image acquisition unit, periodically captures this position images in order to control this image acquisition unit with a specific period; And
One buffer unit is in order to store this position images of up-to-date acquisition.
4. position detecting apparatus as claimed in claim 3 is characterized in that, this buffer unit more stores this position images that is captured before this specific period.
5. position detecting apparatus as claimed in claim 4, it is characterized in that, this processing unit is compared this position images that is captured before this position images of up-to-date acquisition and last this specific period, and decides this ad-hoc location of this determinand according to both difference.
6. position detecting apparatus as claimed in claim 2 is characterized in that, this frame loops is provided with thereon around a planar object, to define this spatial dimension on this planar object.
7. position detecting apparatus as claimed in claim 6 is characterized in that, this planar object is a display screen.
8. position detecting apparatus as claimed in claim 6 is characterized in that, this framework is arranged between this planar object and the shield, and this shield is used for reducing the size of this this spatial dimension of image acquisition unit sensing.
9. position detecting apparatus as claimed in claim 1 is characterized in that, this image acquisition unit is one or its combination of CMOS image sensor protecting low temperature oxide delamination or digital camera.
10. a position detection method is characterized in that, is positioned at the ad-hoc location on the planar object in order to determine at least one determinand, and this method comprises the following steps:
Periphery on this planar object is provided with a plurality of image acquisition units;
Each this image acquisition unit captures a position images to this determinand respectively, and wherein this position images records the relativeness of the surface location of this ad-hoc location and this planar object; And
Decide this ad-hoc location of this determinand according to each this position images.
11. position detection method as claimed in claim 10 is characterized in that, more comprises the following steps:
Corresponding relation between the surface location of setting up this planar object and this image acquisition unit; And
Proofread and correct this position images according to this corresponding relation.
12. position detection method as claimed in claim 11 is characterized in that, sets up in the step of this corresponding relation more to comprise the following steps:
The plurality of sample point is provided, and each this sample point is positioned at the same this position on this planar object;
To the same this position image of this sample point acquisition, wherein this sample position photologging has the relativeness of the surface location of this sample position and this planar object to each this image acquisition unit respectively; And
Write down this sample point, this sample position and this sample position image thereof and produce this corresponding relation.
13. position detection method as claimed in claim 12 is characterized in that, proofreaies and correct according to this corresponding relation in the step of this position images more to comprise the following steps:
Find out at least one and this nearest sample point of this ad-hoc location this determinand; And
According to proofreading and correct this position images from this sample position and this sample position image of this nearest sample point of this ad-hoc location.
14. position detection method as claimed in claim 13 is characterized in that, this ad-hoc location of this determinand is to decide according to each this position images after proofreading and correct.
15. position detection method as claimed in claim 10 is characterized in that, when the image of this image acquisition unit on this planar object changes, and these position images of beginning acquisition.
16. position detection method as claimed in claim 10, it is characterized in that, this image acquisition unit periodically captures this position images with a specific period, and this position images difference between the two that is captured before making this ad-hoc location of this determinand according to this position images of up-to-date acquisition and last this specific period decides.
17. position detection method as claimed in claim 10 is characterized in that, this planar object is a display screen.
18. position detection method as claimed in claim 10 is characterized in that, this image acquisition unit is one or its combination of CMOS image sensor protecting low temperature oxide delamination or digital camera.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910008782A CN101833398A (en) | 2009-03-09 | 2009-03-09 | Position detecting device and method thereof |
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| CN200910008782A CN101833398A (en) | 2009-03-09 | 2009-03-09 | Position detecting device and method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467295A (en) * | 2010-10-28 | 2012-05-23 | 原相科技股份有限公司 | View screen display module, display device and electronic device adopting same |
| CN103002203A (en) * | 2011-09-09 | 2013-03-27 | 亚洲光学股份有限公司 | Image detection module capable of selecting different detection ranges |
| CN111504608A (en) * | 2019-01-31 | 2020-08-07 | 中强光电股份有限公司 | Brightness uniformity detection system and brightness uniformity detection method |
-
2009
- 2009-03-09 CN CN200910008782A patent/CN101833398A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467295A (en) * | 2010-10-28 | 2012-05-23 | 原相科技股份有限公司 | View screen display module, display device and electronic device adopting same |
| CN102467295B (en) * | 2010-10-28 | 2014-04-02 | 原相科技股份有限公司 | View screen display module, display device and electronic device adopting same |
| CN103002203A (en) * | 2011-09-09 | 2013-03-27 | 亚洲光学股份有限公司 | Image detection module capable of selecting different detection ranges |
| CN111504608A (en) * | 2019-01-31 | 2020-08-07 | 中强光电股份有限公司 | Brightness uniformity detection system and brightness uniformity detection method |
| CN111504608B (en) * | 2019-01-31 | 2022-10-04 | 中强光电股份有限公司 | Brightness uniformity detection system and brightness uniformity detection method |
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Open date: 20100915 |