CN103092438B - A kind of infrared touching device and multi-point touch locating method - Google Patents
A kind of infrared touching device and multi-point touch locating method Download PDFInfo
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- CN103092438B CN103092438B CN201310033068.5A CN201310033068A CN103092438B CN 103092438 B CN103092438 B CN 103092438B CN 201310033068 A CN201310033068 A CN 201310033068A CN 103092438 B CN103092438 B CN 103092438B
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Abstract
The present invention proposes a kind of infrared touching device and multi-point touch locating method, infrared touching device is included in infrared emission module, infrared receiver module, control bus, signal processing unit, A/D converter and microprocessor that direction in length and breadth arranges, in the launching and receiving module of correspondence, an infrared transmitting tube connects an infrared emission module group controlling circuit separately; An infrared receiving tube connects N number of infrared receiver module control circuit separately; One of them infrared transmitting tube is corresponding N(N >=3 simultaneously) individual infrared receiving tube, form the scanning of synchronous multi-angle; Described infrared receiver module control circuit connects a signal processing unit and an A/D converter separately successively.Corresponding multi-point touch locating method is the data input microprocessor process after A/D transforms by collecting after the scanning of Fast synchronization multi-angle.Invention increases the accuracy of infrared touching device identification multiple point touching, and realize multiple spot and write.
Description
Technical field
The present invention relates to infrared touching device field, particularly relate to and a kind ofly can distinguish infrared touching device and the multi-point touch locating method that operation is carried out writing in multiple touch point simultaneously.
Background technology
At present, touch-screen is widely used in many occasions and field as the input equipment of a kind of replacement or supplementary common keyboard and mouse.In existing touch-screen, detecting the detection and localization technology touching place based on different technology, can comprise infrared, camera, sound wave etc.
Along with the development of the development especially computer hardware technology of science and technology, computing machine has powerful function, almost can be applied to any field that we can imagine, and multiple point touching technology more person easy to use can operate computing machine, this just requires that touch-screen supports multiple point touching operation, can detect and identify more than one touch point.Current several technical schemes realizing multiple point touching, if application number is 02822048.X, the scheme that the Chinese patent of 200580011740.4 is announced, and be not suitable for infrared touch panel.For solving the problem of the multiple touch point of infrared touch panel None-identified, industry has made many good tries.
Wherein a kind of scheme is, adds auxiliary positioning means, and the outward flange as shielded at infrared touch additionally adds one or two camera and distinguishes multiple touch point, this approach increases cost, realizes difficulty; Another scheme gets rid of imaginary point by trajectory analysis, relies on software algorithm to carry out trajectory analysis, carry out ID coupling after getting rid of imaginary point to real point.Although without additional hardware cost, start to write for 2 simultaneously and cannot judge, when imaginary point, real point close together, error probability is large.Have person for " false multiple spot ", generally can only meet and touch use, writing effect is difficult to ensure.Explain imaginary point for existing Infrared touch screen systems, this system light forms lattice structure in the scanning of infrared touch panel surface matrix, when touch being detected, determines to touch the position coordinates that the grid node position occurred just can calculate touch event generation.When there being two uneven touch points, system will calculate two horizontal ordinate X values, two ordinate Y values, the combination of horizontal ordinate and ordinate has 2X2=4 kind, wherein two groups of coordinates truly put position coordinates, and other two kinds is virtual spot location coordinate, and the position coordinates causing system-computed to go out is not likely real position coordinates, not the place of actual touch, cause erroneous judgement.So imaginary point is also known as " terrible point ".
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide and a kind ofly can identify that two or more touch the infrared touching device simultaneously write simultaneously.
Another object of the present invention is to provide and a kind ofly uses above-mentioned infrared touching device to realize multiple spot to touch the multi-point touch locating method simultaneously write simultaneously.
For achieving the above object, the present invention by the following technical solutions:
A kind of infrared touching device, be included in infrared emission module, infrared receiver module, control bus, signal processing unit, A/D converter and microprocessor that direction in length and breadth arranges, described infrared emission module is connected with described microprocessor by described control bus with infrared receiver module; Described infrared emission module comprises infrared transmitting tube array and infrared emission module group controlling circuit that direction in length and breadth arranges, and one of them infrared transmitting tube connects an infrared emission module group controlling circuit separately; Described infrared receiver module comprises infrared receiving tube array and infrared receiver module control circuit that direction in length and breadth arranges, and one of them infrared receiving tube connects N number of infrared receiver module control circuit separately; In the correspondence of infrared transmitting tube array and infrared receiving tube array, one of them infrared transmitting tube is corresponding N number of infrared receiving tube simultaneously, forms the scanning of synchronous multi-angle;
In above-mentioned, a described infrared receiver module control circuit connects a described signal processing unit separately successively and is connected with described microprocessor with after a described A/D converter;
In above-mentioned, N >=3.
Preferably, the while of a described infrared transmitting tube in corresponding N number of infrared receiving tube, comprise the vertical corresponding and correspondence that tilts.
Preferably, the described infrared receiver module control circuit logic control circuit that comprises analog switch and be connected with analog switch.
The present invention realizes the localization method of multiple point touching, mainly comprises the steps:
(1), infrared emission module chooses the infrared transmitting tube of a passage successively;
(2) open multiple reception module, each reception module infrared receiving tube that gating is corresponding with the power valve different angles that (1) step is chosen respectively, simultaneously;
(3), the infrared transmitting tube chosen starts to launch infrared ray, forms synchronous multi-angle scanning;
(4), by after signal processing unit synchronous acquisition multiple signals value, microprocessor is transferred data to by A/D converter;
(5), infrared transmitting tube stops launching infrared ray;
(6), judge whether to have scanned all passages;
(7) if step (6) is judged as having scanned all passages, then analyze all signal values, determine position, each touch point; If be judged as not scanned all passages, then return step (1).
Circulation step (1) identifies the movement locus of each touch point to step (7).
Compared with prior art, the present invention has following beneficial effect:
1, can realize multiple point touching location and multiple spot write simultaneously;
2, Fast synchronization (simultaneously) scanning, infrared emission module and infrared receiver module do not have complicated sequential corresponding relation, and software easily realizes.
3, multi-angle scanning, can improve the accuracy identifying multiple point touching;
4, the method realizing multipoint positioning is comparatively simple, touch point position coordinates convenience of calculation, accurately, reliable.
5, circuit board type is few, regular shape, is easy to realize large-scale production.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit structure diagram of infrared touching device of the present invention;
Fig. 2 is multi-point touch locating method process flow diagram of the present invention;
Fig. 3 to Fig. 4 is multi-point touch locating method of the present invention synchronous multi-angle scanning schematic diagram.
Fig. 5 is that the embodiment of the present invention 2 touch points obtain 3 angle scanning schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, a kind of infrared touching device, be included in the infrared emission module that direction in length and breadth arranges, infrared receiver module, control bus, the signal processing circuit of signal processing unit 4(also namely shown in figure), A/D converter 5 and microprocessor 2, control bus comprises emitting mould train control bus and receives module control bus, infrared emission module is connected with described microprocessor by emitting mould train control bus, infrared receiver module is connected with described microprocessor by described reception module control bus, described infrared emission module comprises infrared transmitting tube array 8 and infrared emission module group controlling circuit 1 that direction in length and breadth arranges, one of them infrared transmitting tube connects an identical infrared emission module group controlling circuit 1 separately, described infrared receiver module comprises infrared receiving tube array 9 and infrared receiver module control circuit 3 that direction in length and breadth arranges, and one of them infrared receiving tube connects N number of infrared receiver module control circuit 3 separately, in the correspondence of infrared transmitting tube array and infrared receiving tube array, one of them infrared transmitting tube is corresponding N number of infrared receiving tube simultaneously, forms the scanning of synchronous multi-angle,
In above-mentioned, a described infrared receiver module control circuit connects a described signal processing unit separately successively and is connected with described microprocessor with after a described A/D converter;
In above-mentioned, N >=3.
It should be noted that, the N value of diverse location of the present invention its value is all simultaneously identical, as connected 3 infrared receiver module control circuits 3 separately when an infrared receiving tube, a then infrared transmitting tube corresponding 3 infrared receiving tubes simultaneously, the N value below related to is all.
Preferably, the while of a described infrared transmitting tube in corresponding N number of infrared receiving tube, comprise the vertical corresponding and correspondence that tilts.So both ensure that containing while matrix-scanning, had again the scanning of other angles.
Preferably, the described infrared receiver module control circuit logic control circuit 7 that comprises analog switch 6 and be connected with analog switch 6.
Multi-point touch locating method process flow diagram of the present invention shown in Figure 2, mainly comprises the steps:
(1), infrared emission module chooses the infrared transmitting tube of a passage successively;
(2) open multiple reception module, each reception module infrared receiving tube that gating is corresponding with the power valve different angles that (1) step is chosen respectively, simultaneously;
(3), the infrared transmitting tube chosen starts to launch infrared ray, forms synchronous multi-angle scanning;
(4), by after signal processing unit synchronous acquisition multiple signals value, microprocessor is transferred data to by A/D converter;
(5), infrared transmitting tube stops launching infrared ray;
(6), judge whether to have scanned all passages;
(7) if step (6) is judged as having scanned all passages, then analyze all signal values, determine position, each touch point; If be judged as not scanned all passages, then return step (1).
Infrared touching device of the present invention can arrange an electronic counter be connected with infrared transmitting tube array (not shown), carrys out auxiliary judgment above-mentioned steps (6).Corresponding method is:
1), infrared emission channel counts value clear 0;
2), when channel counts value is shown as 1, infrared emission module chooses No. 1 infrared transmitting tube, wherein
Channel counts value corresponds to number number of infrared transmitting tube;
3) open multiple reception module, each reception module is gating and the infrared transmitting tube chosen respectively, simultaneously
The infrared receiving tube that different angles are corresponding;
4), the infrared transmitting tube chosen starts to launch infrared ray, forms synchronous multi-angle scanning;
5), by after signal processing unit synchronous acquisition multiple signals value, microprocessor is transferred data to by A/D converter;
6), infrared transmitting tube stop launch infrared ray, channel counts value increases progressively 1;
7) judge whether channel counts value is greater than the maximum infrared transmitting tube number of this device setting;
8) if step 7) is judged as YES, then scanned all passages, then analyzed all signal values, determined position, each touch point, if be not, then do not scanned all passages, then returned step 2).
Certainly, above-mentioned channel counts value can pass through an independently external unit, and namely described electronic counter carries out, and also directly can directly arrange electronic counting function on the microprocessor.
Discuss the present invention below in detail and how carry out multiple point touching location by this infrared touching device and multiple spot is write, only with two-point locating, the synchronous scanning of above-mentioned N=3 tri-angle is that example describes in detail, and the location, touch point of more than 2 can be routine with reference to this.
See Fig. 3 and Fig. 4, in infrared touching device, infrared emission module chooses an infrared transmitting tube 101, open 3 infrared receiving tubes 201,202,203 simultaneously, open corresponding infrared transmitting tube 101, infrared transmitting tube starts to launch infrared ray, form 3 synchronous angle scannings, then 3 infrared receiving tubes are by after respective signal processing unit synchronous acquisition 3 road signal value, microprocessor is transferred data to by respective A/D converter, then infrared transmitting tube 101 stops launching infrared ray, completes a Channel scan process; Open another one infrared transmitting tube 102 again, corresponding infrared receiving tube can be 202,203,204, repeats above-mentioned synchronous multi-angle scanning process.According in figure shown in arrow, choose passage infrared transmitting tube successively in order, until after judging that all Channel scan complete, at all signal values of microprocessor analysis, determine position, each touch point.
See Fig. 5, a reference method of calculating is as follows: can obtain two coordinate figures of X and two ordinate values of Y in the scanning of vertical and horizontal, and oblique scanning simultaneously can obtain the relation between Y and X,
Y=X·f(θ）。
The wherein angle that represents as Fig. 5 of θ, f (θ) represents the trigonometric function relation about θ between ordinate Y and horizontal ordinate X.
Two touch points allocation (in Fig. 5 shown in stain) really can be determined further by above-mentioned formula, thus get rid of imaginary point (in Fig. 5 shown in white point).
According to this routine principle, can sum up: scan from N number of angle, touch while at least can identifying (N-1) individual point.After the position identifying each touch point, circulation performs above-mentioned steps (1) identifies each touch point movement locus to step (7), calculates the movement locus of touch point under the scanning of Fast synchronization multi-angle.Judge that the track of touch point needs strictly to mate the ID of touch point.The method that touch point ID mates is as follows:
1) put known position, movement velocity and direction above according to each and carry out trajectory analysis, made a prediction in the position that most probable occurs next time.
2) the some position newly detected and all predicted values, use the match condition of mathematical method judging point.
The method can pass through software simulating.
After above-mentioned ID coupling, multiple spot can be realized and write.
Above-described is only a preferred embodiment of the present invention, is not limit the present invention.The equivalent variations that those of ordinary skill in the art makes according to the record of this instructions; computation model as adopted by signal value input microprocessor is different; as long as make use of the scheme of these claims of Fast synchronization and multi-angle scanning, be namely considered as dropping on protection scope of the present invention.
Claims (2)
1. a multi-point touch locating method for infrared touching device, is characterized in that, comprises the steps:
(1), infrared emission module chooses the infrared transmitting tube of a passage successively;
(2) open multiple reception module, each reception module infrared receiving tube that gating is corresponding with the power valve different angles that (1) step is chosen respectively, simultaneously;
(3), the infrared transmitting tube chosen starts to launch infrared ray, forms synchronous multi-angle scanning;
(4), by after signal processing unit synchronous acquisition multiple signals value, microprocessor is transferred data to by A/D converter;
(5), infrared transmitting tube stops launching infrared ray;
(6), judge whether to have scanned all passages;
(7) if step (6) is judged as having scanned all passages, then analyze all signal values, determine position, each touch point; If be judged as not scanned all passages, then return step (1);
Infrared touching device arranges an electronic counter be connected with infrared transmitting tube array and carrys out auxiliary judgment above-mentioned steps (6), and corresponding method is:
1), infrared emission channel counts value clear 0;
2), when channel counts value is shown as 1, infrared emission module chooses No. 1 infrared transmitting tube, and wherein channel counts value corresponds to number number of infrared transmitting tube; When channel counts value is shown as L, infrared emission module chooses L infrared transmitting tube, wherein L be not 1 natural number;
3) open multiple reception module, each reception module infrared receiving tube that gating is corresponding with the infrared transmitting tube different angles chosen respectively, simultaneously;
4), the infrared transmitting tube chosen starts to launch infrared ray, forms synchronous multi-angle scanning;
5), by after signal processing unit synchronous acquisition multiple signals value, microprocessor is transferred data to by A/D converter;
6), infrared transmitting tube stop launch infrared ray, channel counts value increases progressively 1;
7) judge whether channel counts value is greater than the maximum infrared transmitting tube number of this device setting;
8) if step 7) be judged as YES, then scanned all passages, then analyzed all signal values, determined position, each touch point, if be not, then do not scanned all passages, then returned step 2);
All signal values are analyzed in step (7), determine that computing method of position, each touch point are as follows: two coordinate figures of X and two ordinate values of Y can be obtained in the scanning of vertical and horizontal, oblique scanning simultaneously can obtain the relation between Y and X
Y＝X·f(θ)
Wherein θ represents the angle between oblique scanning and the scanning of longitudinal direction, and f (θ) represents the trigonometric function relation about θ between ordinate Y and horizontal ordinate X;
Touch point allocation is really determined further by above-mentioned formula.
2. multi-point touch locating method as claimed in claim 1, it is characterized in that, circulation step (1) identifies the movement locus of each touch point to step (7).
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Families Citing this family (6)
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| CN105183238B (en) * | 2014-06-20 | 2020-09-01 | 鸿合科技股份有限公司 | Handwriting erasing method and device based on infrared whiteboard and infrared whiteboard |
| CN104182092B (en) * | 2014-08-04 | 2017-03-29 | 深圳市巨浪科教设备有限公司 | Infrared touch screen positioning method and system |
| US11029549B2 (en) * | 2015-04-28 | 2021-06-08 | Wicue, Inc. | Liquid crystal writing device |
| CN109947301A (en) * | 2019-03-19 | 2019-06-28 | 深圳市康冠商用科技有限公司 | Touch localization method and relevant apparatus in a kind of infrared touch frame |
| CN110333801B (en) * | 2019-07-17 | 2023-04-07 | 广州华欣电子科技有限公司 | Infrared touch screen |
| CN112947799B (en) * | 2021-02-02 | 2023-05-23 | 山西大众电子信息产业集团有限公司 | Multi-board communication and multi-way cross scanning device and method for multi-point infrared touch screen |
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