CN102999234A - Infrared touch screen positioning method and device - Google Patents

Infrared touch screen positioning method and device Download PDF

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Publication number
CN102999234A
CN102999234A CN2012105538134A CN201210553813A CN102999234A CN 102999234 A CN102999234 A CN 102999234A CN 2012105538134 A CN2012105538134 A CN 2012105538134A CN 201210553813 A CN201210553813 A CN 201210553813A CN 102999234 A CN102999234 A CN 102999234A
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value
infrared
receiving tube
infrared receiving
data
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CN2012105538134A
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徐响林
钟杰婷
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Vtron Technologies Ltd
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Vtron Technologies Ltd
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Abstract

The invention discloses an infrared touch screen positioning method and an infrared touch screen positioning device. The method comprises the following steps of: respectively acquiring a first data value of each infrared receiving tube before a corresponding infrared transmitting tube is lighted and a second data value of each infrared receiving tube when the corresponding infrared transmitting tube is lighted in a touch-less state, and calculating the difference of the first data value and the second data value to serve as an initialization value of the infrared transmitting tube; controlling the infrared transmitting tube and the infrared receiving tube to perform scanning, respectively acquiring a third data value of each infrared receiving tube before a corresponding infrared transmitting tube is lighted and a fourth data value of each infrared receiving tube when the corresponding infrared transmitting tube is lighted, calculating the difference of the third data value and the fourth data value to serve as a scanning reading value of each infrared receiving tube; determining the shielding data according to the difference between the initialization value of the data of each infrared receiving tube and the scanning reading value; and calculating a touch coordinate according to the shielding data when the scanning is finished. The initialization value of the infrared receiving tube is arranged, the function of ambient light is effectively eliminated, the touch positioning accuracy of the infrared touch device is improved, and the infrared touch screen positioning method is low in cost, easy to realize and wide in application range.

Description

A kind of infrared touch panel localization method and device
Technical field
The present invention relates to the infrared touch technical field, more specifically, relate to a kind of localization method and device of infrared touch panel.
Background technology
Touching technique provides great convenience to man-machine interaction mode, technically also provides multiple solution.Such as the infrared scan touching device, based on touching device of camera positioning etc.
But existing infrared scan touching device normally has ambient light to exist in the applied environment, disturb so that touching device is subject to ambient light easily.Publication number be CN2824143Y patent disclosure with the infrared touch panel of optical lens, it passes through at infrared transmitting tube and receiving tube front end, the cylinder optical lens all is installed, is improved the infrared light effective rate of utilization that infrared transmitting tube is launched, improve the anti-smooth interference performance of infrared touch panel with this.But when external interference light was stronger, stray light still can affect greatly said apparatus, can not eliminate from root the impact of external interference light.
Therefore, provide a kind of touching device that can affect from the minimizing ambient light of maximum possible on the root to be necessary very much, particularly can in the situation of surround lighting acute variation, eliminate the impact of external interference light, the accurate location of accomplishing touch location.
Summary of the invention
Based on this, for above-mentioned problems of the prior art, the object of the present invention is to provide a kind of localization method of infrared touch panel, another purpose is to provide a kind of infrared touch panel locating device, it reduces the ambient light impact as much as possible on root, improve the accuracy that touching device touches the location, eliminate the impact of external interference light in the situation of the light acute variation that conforms especially.
For achieving the above object, technical solution of the present invention is:
A kind of infrared touch panel localization method comprises step:
S1. under the no touch state, obtain respectively first data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the second data value when lighting, calculate the absolute value of difference of the first data value and the second data value as the initialization value of this infrared receiving tube;
S2. scanned infrared power valve and infrared receiving tube, obtain respectively three data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the 4th data value when lighting, calculate the absolute value of difference of the 3rd data value and the 4th data value as the scanning read value of each infrared receiving tube;
S3. determine the shield data according to the difference between each infrared receiving tube data initialization value and the scanning read value;
When S4. scanning is finished, calculate touch coordinate according to blocking data.
This law is by obtaining first under touch condition, obtain infrared tube centering power valve and light the data of the corresponding receiving tube in front and back, and with both absolute value of difference as the initialization value of the right receiving tube of this infrared tube, then under the general work state, by certain time interval touch-screen is scanned, scan each infrared tube pair, obtain each infrared tube centering power valve and light the data of the corresponding receiving tube in front and back, and the absolute value of both differences is as the scanning read value of corresponding receiving tube, determine to block data by the scanning read value of each receiving tube and the difference of initialization value at last, thereby calculate touch coordinate.
A kind of locating device of infrared touch panel comprises:
Initialization module, be used under the no touch state, obtain respectively first data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the second data value when lighting, calculate the absolute value of difference of the first data value and the second data value as the initialization value of this infrared receiving tube;
Scanning read value module, be used for when infrared transmitting tube and infrared receiving tube scanning, obtaining respectively three data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the 4th data value when lighting, calculate the absolute value of difference of the 3rd data value and the 4th data value as the scanning read value of each infrared receiving tube;
Block data acquisition module with described initialization module and scanning computing module are connected, be used for determining the shield data according to each infrared receiving tube data initialization value and the difference that scans between the read value;
With the coordinate Calculation module of blocking data acquisition module and being connected, be used for calculating touch coordinate according to blocking data.
Compared with prior art, the present invention has following beneficial effect: the absolute value of the difference by calculating the infrared receiving tube data of constantly obtaining for 2 times in difference is as this infrared receiving tube initialization value, effectively eliminate the effect of surround lighting, thereby the external influence of light of minimizing of maximum possible on the root, improve the accuracy that infrared touching device touches the location, eliminate the impact of external interference light in the situation of the light acute variation that conforms especially, and need not existing touching device hardware is changed, cost is low easily to be realized, applied widely.
Description of drawings
Fig. 1 is infrared touch panel localization method embodiment one flow process synoptic diagram of the present invention.
Fig. 2 is infrared touch panel localization method embodiment two flow process synoptic diagram of the present invention.
Fig. 3 is infrared touch panel localization method embodiment three schematic flow sheets of the present invention.
Fig. 4 is the structural representation of infrared touch panel locating device embodiment of the present invention.
Fig. 5 is the work synoptic diagram of infrared touch panel locating device embodiment of the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with drawings and Examples.
Embodiment one
The schematic flow sheet of infrared touch panel localization method embodiment one of the present invention has been shown among Fig. 1.
As shown in Figure 1, in this embodiment, the infrared touch panel localization method comprises step:
S101. under the no touch state, obtain respectively first data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the second data value when lighting, calculate the absolute value of difference of the first data value and the second data value as the initialization value of this infrared receiving tube;
S102. control infrared transmitting tube and infrared receiving tube scans, obtain respectively three data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the 4th data value when lighting, calculate the absolute value of difference of the 3rd data value and the 4th data value as the scanning read value of each infrared receiving tube;
S103. determine the shield data according to the difference between each infrared receiving tube data initialization value and the scanning read value;
When S104. scanning is finished, calculate touch coordinate according to blocking data.
In the technical scheme of present embodiment, the absolute value of the difference by calculating the infrared receiving tube data of constantly obtaining for 2 times in difference is as this infrared receiving tube initialization value, effectively eliminate the effect of surround lighting, thereby the external influence of light of minimizing of maximum possible on the root, improve the accuracy that infrared touching device touches the location, eliminate the impact of external interference light in the situation of the light acute variation that conforms especially, and need not existing touching device hardware is changed, cost is low easily to be realized, applied widely.
Embodiment two
The schematic flow sheet of infrared touch panel localization method embodiment two of the present invention has been shown among Fig. 2.
As shown in Figure 2, in this embodiment, the infrared touch panel localization method comprises step:
S201. under the no touch state, read the first data value of single infrared receiving tube;
S202. light the infrared transmitting tube corresponding with this infrared receiving tube, and read the second data value of this infrared receiving tube;
S203. calculate the absolute value of difference of the first data value and the second data value as the initialization value of this infrared receiving tube;
S204. repeating step S201 to S203 is until compose initialization value with all infrared receiving tubes;
S205. control infrared transmitting tube and infrared receiving tube scans, read the 3rd data value of single infrared receiving tube;
S206. light the infrared transmitting tube corresponding with this infrared receiving tube, and read the 4th data value of this infrared receiving tube;
S207. calculate the absolute value of difference of the 3rd data value and the 4th data value as the scanning read value of this infrared receiving tube;
S208. repeating step S205 to S207 is until obtain the scanning read value of all infrared receiving tubes;
S209. calculate each infrared receiving tube initialization value and the difference of scanning between the read value, and whether judge this difference greater than pre-set threshold value, greater than then being judged as occlusion state, wherein said pre-set threshold value be infrared receiving tube the scanning read value 70%;
S2010. block data when being judged as to record when blocking;
When S2011. scanning is finished, calculate touch coordinate according to blocking data.
A kind of further refinement scheme to embodiment 1 at present embodiment, in the technical scheme of present embodiment, the initialization value of infrared receiving tube and scanning read value are to adopt the mode of obtaining and calculate single infrared receiving tube data one by one to draw, effectively eliminate the effect of surround lighting, thereby the external influence of light of minimizing of maximum possible on the root, improve the accuracy that infrared touching device touches the location, eliminate the impact of external interference light in the situation of the light acute variation that conforms especially, and need not existing touching device hardware is changed, cost is low easily to be realized, applied widely.
Embodiment three
The schematic flow sheet of infrared touch panel localization method embodiment three of the present invention has been shown among Fig. 3.
As shown in Figure 3, in this embodiment, the infrared touch panel localization method comprises step:
S301. under the no touch state, read the first data value of each infrared receiving tube;
S302. light the infrared transmitting tube corresponding with each infrared receiving tube, and read the second data value of each infrared receiving tube;
S303. calculate the absolute value of difference of each first data value and the second data value as the initialization value of each infrared receiving tube;
S304. control infrared transmitting tube and infrared receiving tube scans, read the 3rd data value of each infrared receiving tube;
S305. light the infrared transmitting tube corresponding with each infrared receiving tube, and read the 4th data value of each infrared receiving tube;
S306. calculate the absolute value of difference of each the 3rd data value and the 4th data value as the scanning read value of each infrared receiving tube;
S307. calculate each infrared receiving tube initialization value and the difference of scanning between the read value, and whether judge this difference greater than pre-set threshold value, greater than then being judged as occlusion state, described pre-set threshold value be infrared receiving tube the scanning read value 80%;
S308. block data when being judged as to record when blocking;
When S309. scanning is finished, calculate touch coordinate according to blocking data.
Another kind of further refinement scheme to embodiment 1 at present embodiment, technical scheme at present embodiment is with the difference of implementing 2: obtaining all infrared receiving tube first data values, behind the second data value, the mode of unifiedly calculating out again each infrared receiving tube initial value draws, the scanning read value of infrared receiving tube also adopts with the similar mode of initial value and obtains, effectively eliminate the effect of surround lighting, thereby the external influence of light of minimizing of maximum possible on the root, improve the accuracy that infrared touching device touches the location, eliminate the impact of external interference light in the situation of the light acute variation that conforms especially, and need not existing touching device hardware is changed, cost is low easily to be realized, applied widely.
Embodiment four
According to the infrared touch panel localization method of the invention described above, the present invention also provides a kind of infrared touch panel locating device.Fig. 5 shows the structural representation of software update system embodiment of the present invention.
As shown in Figure 5, the infrared touch panel locating device in the present embodiment comprises:
Initialization module 401, be used under the no touch state, obtain respectively first data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the second data value when lighting, calculate the absolute value of difference of the first data value and the second data value as the initialization value of this infrared receiving tube, wherein, this initialization module 401 specifically comprises: the first read module 4011, be used under the no touch state, read the first data value of each infrared receiving tube, and when lighting each corresponding infrared transmitting tube, read the second data value of each described infrared receiving tube; The first computing module 4012 be used for to calculate the absolute value of the difference of the first data value of each infrared receiving tube and the second data value, and with the absolute value of this difference initialization value as each infrared receiving tube.
Scanning read value module 402, be used for when infrared transmitting tube and infrared receiving tube scanning, obtaining respectively three data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the 4th data value when lighting, calculate the absolute value of difference of the 3rd data value and the 4th data value as the scanning read value of each infrared receiving tube, wherein, this initialization module 402 specifically comprises: the second read module 4021, be used for when infrared transmitting tube and infrared receiving tube scan, reading the 3rd data value of each infrared receiving tube; The second computing module 4022, for the absolute value of the difference of calculating each the 3rd data value and the 4th data value, and the absolute value of this difference is as the scanning read value of each infrared receiving tube.
What be connected with described initialization module 401 and scanning read value module 402 blocks data acquisition module 403, be used for determining the shield data according to the difference between each infrared receiving tube data initialization value and the scanning read value, wherein, this initialization module 403 specifically comprises: condition judgment module, be used for calculating the difference between each infrared receiving tube initialization value and the scanning read value, and whether judge this difference greater than pre-set threshold value, greater than then being judged as occlusion state; Data recordin module is used for recording when blocking blocking data.
With the coordinate Calculation module 404 of blocking data acquisition module 403 and being connected, be used for calculating touch coordinate, the position, touch point that draws red touch-screen according to blocking data.
Because the electric voltage frequency of external environment condition light source is generally the sine wave of 50HZ, therefore, the infrared scan touching device light the infrared transmitting tube frequency requirement more than or equal to 100HZ, the infrared scan touching device read the infrared receiving tube frequency requirement more than or equal to 200HZ, the sweep frequency of existing infrared scan touching device can be to meet the demands fully.
For example, at T1 constantly, infrared transmitting tube is not lighted, infrared receiving tube reads the voltage V1 that produced by ambient light effects, at T2 constantly, when infrared transmitting tube was lighted, infrared receiving tube read the voltage V2-1 that produced by ambient light effects, and receiving the infrared light of infrared transmitting tube emission at the voltage V2-2 of infrared receiving tube place generation, the superposition value of these two values is V2-3.Because T1 and two moment of T2 are separated by very near, what therefore can be similar to thinks, the voltage V1 that T1 is produced by ambient light effects constantly equates with the voltage V2-1 that T2 is produced by ambient light effects constantly, therefore, when V2-3 and V1 subtract each other, can effectively balance out the impact of surround lighting, really detect the infrared light of infrared transmitting tube emission at the voltage V2-2 of infrared receiving tube place generation.
When having touch objects, infrared receiving tube initialization value and infrared receiving tube scanning read value subtracts each other, if subtract each other the difference that obtains greater than predetermined threshold value, then has been judged as and has blocked.
Fig. 5 uses infrared touch panel work synoptic diagram of the present invention, the coordinate synoptic diagram, as shown in Figure 5, infrared touch panel 501 is after the scanning of finishing whole infrared tube 5011, laterally block line 5012, vertically block line 5013 data according to what detect, ask its intersection point 5014, precisely determine touch point coordinate (X, Y).
Only be the preferred embodiments of the present invention below, but design concept of the present invention is not limited to this, all insubstantial modifications of utilizing this design that the present invention is made also all fall within protection scope of the present invention.

Claims (9)

1. an infrared touch panel localization method is characterized in that, comprises step:
S1. under the no touch state, obtain respectively first data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the second data value when lighting, calculate the absolute value of difference of the first data value and the second data value as the initialization value of this infrared receiving tube;
S2. scanned infrared power valve and infrared receiving tube, obtain respectively three data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the 4th data value when lighting, calculate the absolute value of difference of the 3rd data value and the 4th data value as the scanning read value of each infrared receiving tube;
S3. determine the shield data according to the difference between each infrared receiving tube data initialization value and the scanning read value;
When S4. scanning is finished, calculate touch coordinate according to blocking data.
2. infrared touch panel localization method according to claim 1 is characterized in that, the process that the infrared receiving tube among the described step S1 is composed initialization value specifically comprises:
S111. under the no touch state, read the first data value of single infrared receiving tube;
S112. light the infrared transmitting tube corresponding with this infrared receiving tube, and read the second data value of this infrared receiving tube;
S113. calculate the absolute value of difference of the first data value and the second data value as the initialization value of this infrared receiving tube;
S114. repeating step S111 to S113 is until compose initialization value with all infrared receiving tubes;
Perhaps
Described the first data value and the second data value acquisition process specifically comprise:
S121. under the no touch state, read the first data value of each infrared receiving tube;
S122. light the infrared transmitting tube corresponding with each infrared receiving tube, and read the second data value of each infrared receiving tube;
S123. calculate the absolute value of difference of the first right data value of each infrared tube and the second data value as the initialization value of corresponding infrared receiving tube.
3. infrared touch panel localization method according to claim 1 is characterized in that, the acquisition process of the scanning read value among the described step S2 specifically comprises:
S211. control infrared transmitting tube and infrared receiving tube scans, read the 3rd data value of single infrared receiving tube;
S212. light the infrared transmitting tube corresponding with this infrared receiving tube, and read the 4th data value of this infrared receiving tube;
S213. calculate the absolute value of difference of the 3rd data value and the 4th data value as the scanning read value of this infrared receiving tube;
S214. repeating step S211 to S213 is until obtain the scanning read value of all infrared receiving tubes;
Perhaps
The scanning read value gets acquisition process and specifically comprises:
S221. control infrared transmitting tube and infrared receiving tube scans, read the 3rd data value of each infrared receiving tube;
S222. light the infrared transmitting tube corresponding with each infrared receiving tube, and read the 4th data value of each infrared receiving tube;
S223. calculate the absolute value of difference of each the 3rd data value and the 4th data value as the scanning read value of each infrared receiving tube.
4. infrared touch panel localization method according to claim 1, it is characterized in that, definite mode of the shield data among the described step S3 is: calculate the difference between each infrared receiving tube initialization value and the scanning read value, and whether judge this difference greater than pre-set threshold value, greater than then being judged as occlusion state; Block data when being judged as to record when blocking.
5. infrared touch panel localization method according to claim 4 is characterized in that, described pre-set threshold value be infrared receiving tube the scanning read value 70% ~ 80%.
6. an infrared touch panel locating device is characterized in that, comprising:
Initialization module, be used under the no touch state, obtain respectively first data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the second data value when lighting, calculate the absolute value of difference of the first data value and the second data value as the initialization value of this infrared receiving tube;
Scanning read value module, be used for when infrared transmitting tube and infrared receiving tube scanning, obtaining respectively three data value of each infrared receiving tube before the infrared transmitting tube of correspondence is lighted and the 4th data value when lighting, calculate the absolute value of difference of the 3rd data value and the 4th data value as the scanning read value of each infrared receiving tube;
Block data acquisition module with described initialization module and scanning computing module are connected, be used for determining the shield data according to each infrared receiving tube data initialization value and the difference that scans between the read value;
With the coordinate Calculation module of blocking data acquisition module and being connected, be used for calculating touch coordinate according to blocking data.
7. infrared touch panel locating device according to claim 6 is characterized in that, described initialization module comprises:
The first read module is used for reading the first data value of each infrared receiving tube, and when lighting each corresponding infrared transmitting tube, reading the second data value of each described infrared receiving tube under the no touch state;
The first computing module be used for to calculate the absolute value of the difference of the first data value of each infrared receiving tube and the second data value, and with the initialization value of this difference as each infrared receiving tube.
8. raising infrared touch panel anti-disturbance method according to claim 6 is characterized in that, described scanning read value module comprises:
The second read module is used for reading the 3rd data value of each infrared receiving tube when infrared transmitting tube and infrared receiving tube scan;
The second computing module, for the absolute value of the difference of calculating each the 3rd data value and the 4th data value, and this difference is as the scanning read value of each infrared receiving tube.
9. infrared touch panel locating device according to claim 6 is characterized in that, the described data acquisition module that blocks comprises:
Condition judgment module is used for calculating the difference between each infrared receiving tube initialization value and the scanning read value, and whether judges this difference greater than pre-set threshold value, greater than then being judged as occlusion state;
Data recordin module is used for recording when blocking blocking data.
CN2012105538134A 2012-12-19 2012-12-19 Infrared touch screen positioning method and device Pending CN102999234A (en)

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CN103995624A (en) * 2014-05-26 2014-08-20 青岛海信电器股份有限公司 Signal-interference-resisting method and device
CN104834411A (en) * 2015-03-11 2015-08-12 河北华发通信技术有限公司 Rapid scanning method for infrared touch screen
CN106477438A (en) * 2016-08-30 2017-03-08 住友富士电梯有限公司 Localization method blocked based on elevator intelligent infrared light curtain
CN116860125A (en) * 2023-08-01 2023-10-10 广州众远智慧科技有限公司 Processing method and device of infrared touch scanning data and infrared touch equipment

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Publication number Priority date Publication date Assignee Title
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CN116860125A (en) * 2023-08-01 2023-10-10 广州众远智慧科技有限公司 Processing method and device of infrared touch scanning data and infrared touch equipment

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Application publication date: 20130327