CN102270071A - Multi-point touch identification method and device - Google Patents
Multi-point touch identification method and device Download PDFInfo
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- CN102270071A CN102270071A CN2011102526728A CN201110252672A CN102270071A CN 102270071 A CN102270071 A CN 102270071A CN 2011102526728 A CN2011102526728 A CN 2011102526728A CN 201110252672 A CN201110252672 A CN 201110252672A CN 102270071 A CN102270071 A CN 102270071A
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Abstract
The invention provides a multi-point touch identification method which comprises the following steps: (1) calculating the coordinates of the intersection point of the center line of blocking lines on the longitudinal and transverse directions according to infrared scanned data on the longitudinal and transverse directions of a touch screen; (2) calculating the width of an oblique blocking line according to the oblique infrared scanned data of the touch screen; and (3) judging the coordinates of a touch point according to the coordinates of the intersection point and the width of the oblique blocking line. The invention also provides a multi-point touch identification device. By utilizing the technology provided by the invention, the coordinates of the touched object are correctly judged, and the identification accuracy of the touch point is improved; and moreover, the data processing capacity is small, the operation process is simple, the touch response speed is greatly increased, the coordinates of the touch point can be calculated on a bottom layer, and the cost of multi-point touch identification is lowered.
Description
Technical field
The present invention relates to touch screen technology, particularly a kind of multi-touch recognition method and device.
Background technology
Touching technique occurs, and it is very big convenient to have brought to people, and particularly the multiple point touching The Application of Technology is given to touch to experience and brought qualitative leap.
At present, multi-touch recognition method mainly is by increasing once or the scanning on the above vergence direction on the basis of scanning on vertical direction in length and breadth, vertical scanning, dip sweeping obtains the block information of a plurality of dimensions, intersection point according to the center line that blocks wide line of different latitude, seek out the coordinate of touch point, be easy to situation about causing misjudgment like this, as shown in Figure 1, three direction of scanning, but block the center line R1 of wide line, R2, R3 intersection point A, B, C is two intersection points that block the line center line, and can't correctly judge the coordinate position of touch objects this moment, simultaneously, along with increasing of touch point, the increase that calculated amount can be at double, computing velocity also can be slack-off.
In addition, for fear of the above-mentioned problem that can't correctly judge the coordinate position of touch objects, a kind of technology is arranged, by the color line that wide line forms the respective width of different colours that blocks with different angles, then by reading the color value of color line intersection point, judge whether to the touch point and calculate the touch point coordinate, but the data maximum dose that this Technology Need is handled is big, the calculating process complexity, influenced touch-responsive speed greatly, and must finish data processing by upper computing machine, can't calculate the touch point coordinate at bottom.
Summary of the invention
In order to address the above problem, the invention provides a kind of multi-touch recognition method and device, improved the recognition accuracy of touch point, also improve the touch point recognition speed simultaneously.
A kind of multi-touch recognition method comprises step:
(1) according to the intersecting point coordinate that blocks the line center line on the longitudinal and transverse direction of infrared scan data computation on the longitudinal and transverse direction of touch-screen;
(2) tilt to block line width according to touch-screen inclination infrared scan data computation;
(3) block line width according to described intersecting point coordinate and described inclination and judge the touch point coordinate.
A kind of multiple point touching recognition device comprises:
The intersecting point coordinate computing module is used for according to the intersecting point coordinate that blocks the line center line on the longitudinal and transverse direction of infrared scan data computation on the longitudinal and transverse direction of touch-screen;
Block the line width computing module, be used for tilting to block line width according to touch-screen inclination infrared scan data computation;
The touch point judge module, the scope that is used for blocking according to described intersecting point coordinate and described inclination line width is judged the touch point coordinate.
Compared with prior art, technology of the present invention is at first according to vertical, the infrared scan of transverse direction calculates preliminary touch point coordinate and calculates inclination according to dip sweeping and blocks line width, judge that then whether preliminary touch point determine actual touch point coordinate in the scope that line width is blocked in inclination, realized the coordinate position of correct judgement touch objects, improved the recognition accuracy of touch point, and the treatment capacity of data is few, calculating process is simple, improve touch-responsive speed greatly, promptly can calculate the touch point coordinate at bottom, reduce the cost of multiple point touching identification.
Description of drawings
Fig. 1 is a prior art touch point identification synoptic diagram;
Fig. 2 is the process flow diagram of multi-touch recognition method of the present invention;
Fig. 3 is that preliminary touch point coordinate synoptic diagram is calculated in scanning on the longitudinal and transverse direction in the application example;
Fig. 4 is that the inclination infrared scan technique computes calculating in the application example tilts to block the line width synoptic diagram;
Fig. 5 is the structural representation of multiple point touching recognition device of the present invention.
Embodiment
Below in conjunction with drawings and Examples multi-touch recognition method of the present invention is described in detail.
Referring to shown in Figure 2, multi-touch recognition method of the present invention comprises step:
(1) according to the intersecting point coordinate that blocks the line center line on the longitudinal and transverse direction of infrared scan data computation on the longitudinal and transverse direction of touch-screen; Above-mentioned each intersecting point coordinate is as preliminary touch point coordinate.
(2) tilt to block line width according to touch-screen inclination infrared scan data computation; This blocks line width and forms for the infrared receiving tube line that is blocked continuously.
(3) block line width according to described intersecting point coordinate and described inclination and judge the touch point coordinate.
For step (1), particularly, on the transverse direction of infrared scan and the scan-data on the longitudinal direction be mainly, carry out on the transverse direction and longitudinal direction on infrared scan the time, the data whether infrared receiving tube that collects is blocked.By asking for the mid point that detects the infrared receiving tube that blocks continuously, make and block the line center line accordingly.
For step (2), particularly, when touch-screen tilted infrared scan, the data of the infrared receiving tube that is blocked continuously when tilting infrared scan according to touch-screen and dip sweeping angle were asked for and are tilted to block line width.
For step (3), preferably, block the intersecting point coordinate that calculates in the line determining step (1) according to the inclination that obtains in the step (2) and whether block in the scope of line, if judge that then this intersecting point coordinate is the touch point coordinate in the inclination that described inclination infrared scan obtains.
For above-mentioned determining step, preferably, at first blocking line width according to inclination asks for and tilts to block the line center line, the intersecting point coordinate that calculates in the calculation procedure (1) and tilt to block distance between the center line of line then, the value of judging this distance again whether greater than inclination block line width 1/2nd, if judge that this intersecting point coordinate is a non-touch point coordinate, if not, judge that then this intersecting point coordinate is the touch point coordinate.
The present invention is by carrying out the infrared scan data that infrared scan obtains on the longitudinal and transverse direction according to touch-screen, ask for preliminary touch point coordinate, judge that then these coordinates whether in the width range of line is blocked in the inclination that dip sweeping obtains, determine actual touch point coordinate; Realized the situation of correct judgement touch point coordinate, and computing is simple, operand is few, improves touch-responsive speed greatly.
For clear more multi-touch recognition method of the present invention, do more detailed the elaboration below in conjunction with accompanying drawing and application example.
Referring to shown in Figure 3, suppose to exist on the touch-screen two touch objects A, B, during the infrared scan of touch-screen on carrying out longitudinal and transverse direction, the Data Detection that is blocked according to the infrared receiving tube that collects is blocked to infrared receiving tube a+3 transversely to a+5 and infrared receiving tube a+21 is blocked to a+23, vertically goes up infrared receiving tube b+4 and is blocked and infrared receiving tube b+22 is blocked to b+24 to b+6.
Ask for the mid point line of infrared receiving tube a+3 then to a+5, obtain blocking line center line L1, ask for the mid point line of infrared receiving tube a+21 to a+23, obtain blocking line center line L2, ask for the mid point line of infrared receiving tube b+4 to b+6, obtain blocking line center line L3, ask for the mid point line of infrared receiving tube b+22, obtain blocking line center line L4 to b+23.
Wherein, the intersection point that intersects of L1, L2, L3, L4 is O1, O2, O3, O4, and the coordinate of asking for intersection point O1, O2, O3, O4 again is as preliminary touch point coordinate.
Referring to shown in Figure 4, when tilting infrared scan according to touch-screen, the data that the infrared receiving tube that collects blocks, detecting infrared receiving tube a+10 is blocked to a+12, infrared receiving tube a+26 is blocked to a+28, according to the dip sweeping angle [alpha], tilt to block line width K1, K2 again in conjunction with trying to achieve respectively.
Get the mid point line of infrared receiving tube a+10 then, obtain tilting to block line center line L5, get the mid point line of infrared receiving tube a+26, obtain tilting to block line center line L6 to a+28 to a+12.And then asking for intersecting point coordinate O1, O2, O3, O4 value S1, S2, S3, S4 respectively to the distance of L5, intersecting point coordinate O1, O2, O3, O4 be to value S5, S6, S7, the S8 of the distance of L6, wherein, S1=0, S8=0 does not make a check mark among the figure.
Whether the value of judging S1, S2, S3, S4 blocks 1/2nd of line width K1 greater than inclination, if, judge that corresponding intersecting point coordinate is a non-touch point coordinate, if not, judge that then corresponding intersecting point coordinate is the touch point coordinate.As shown in Figure 4,1/2nd of the width K1 that has only O1 to be not more than to the value S1 of the distance of L5 to tilt to block line is so determine that the coordinate of O1 is the touch point coordinate.
In like manner, 1/2nd of the width K2 that has only O4 to be not more than to the value S8 of the distance of L6 to tilt to block line is so determine that the coordinate of O4 is the touch point coordinate.
The coordinate of O1, O4 is respectively the touch point coordinate of two touch objects A, B.
Below in conjunction with drawings and Examples multiple point touching recognition device of the present invention is described in detail.
Referring to shown in Figure 5, the multiple point touching recognition device that multi-touch recognition method a kind of and of the present invention is corresponding comprises:
The intersecting point coordinate computing module is used for according to the intersecting point coordinate that blocks the line center line on the longitudinal and transverse direction of infrared scan data computation on the longitudinal and transverse direction of touch-screen;
Block the line width computing module, be used for tilting to block line width according to touch-screen inclination infrared scan data computation;
The touch point judge module, the scope that is used for blocking according to described intersecting point coordinate and described inclination line width is judged the touch point coordinate.
For the intersecting point coordinate computing module, further, be used for the data that are blocked according to infrared receiving tube on the longitudinal and transverse direction of touch-screen, ask for the line that detects the mid point of the infrared receiving tube that blocks continuously on the longitudinal and transverse direction respectively and obtain blocking the line center line on the longitudinal and transverse direction; Ask for the intersecting point coordinate that obtains that blocks the line center line according to the joining of blocking the line center line on the longitudinal and transverse direction then.
For blocking the line width computing module, further, the data and the dip sweeping angle of the infrared receiving tube that is blocked continuously when being used for tilting infrared scan according to touch-screen are asked for and are tilted to block line width.
For the touch point judge module, further, be used for blocking line width and judge that whether described intersecting point coordinate blocks in the scope of line in the inclination that described inclination infrared scan obtains, if judge that then this intersecting point coordinate is the touch point coordinate according to inclination.
The touch point judge module also is further used for blocking line width according to described inclination and asks for and tilt to block the line center line, calculate described intersecting point coordinate and described inclination and block distance between the line center line, the value of judging this distance whether greater than inclination block line width 1/2nd, if, judge that this intersecting point coordinate is a non-touch point coordinate, if not, judge that then this intersecting point coordinate is the touch point coordinate.
Above-described embodiment of the present invention does not constitute the qualification to protection domain of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present invention.
Claims (10)
1. a multi-touch recognition method is characterized in that, comprises step:
(1) according to the intersecting point coordinate that blocks the line center line on the longitudinal and transverse direction of infrared scan data computation on the longitudinal and transverse direction of touch-screen;
(2) tilt to block line width according to touch-screen inclination infrared scan data computation;
(3) block line width according to described intersecting point coordinate and described inclination and judge the touch point coordinate.
2. multi-touch recognition method according to claim 1 is characterized in that, described step (1) comprising:
According to the data that infrared receiving tube on the longitudinal and transverse direction of touch-screen is blocked, ask for the line that detects the mid point of the infrared receiving tube that blocks continuously on the longitudinal and transverse direction respectively and obtain blocking the line center line on the longitudinal and transverse direction;
Ask for the intersecting point coordinate that obtains that blocks the line center line according to the joining of blocking the line center line on the longitudinal and transverse direction.
3. multi-touch recognition method according to claim 1 is characterized in that, described step (2) comprising:
The data of the infrared receiving tube that is blocked continuously when tilting infrared scan according to touch-screen and dip sweeping angle are asked for and are tilted to block line width.
4. multi-touch recognition method according to claim 1 is characterized in that, described step (3) comprising:
Block line width according to described inclination and judge that whether described intersecting point coordinate blocks in the scope of line in the inclination that described inclination infrared scan obtains, if judge that then this intersecting point coordinate is the touch point coordinate.
5. multi-touch recognition method according to claim 4 is characterized in that, described determining step comprises:
Blocking line width according to described inclination asks for and tilts to block the line center line, calculate described intersecting point coordinate and described inclination and block distance between the line center line, the value of judging this distance whether greater than inclination block line width 1/2nd, if, judge that this intersecting point coordinate is a non-touch point coordinate, if not, judge that then this intersecting point coordinate is the touch point coordinate.
6. a multiple point touching recognition device is characterized in that, comprising:
The intersecting point coordinate computing module is used for according to the intersecting point coordinate that blocks the line center line on the longitudinal and transverse direction of infrared scan data computation on the longitudinal and transverse direction of touch-screen;
Block the line width computing module, be used for tilting to block line width according to touch-screen inclination infrared scan data computation;
The touch point judge module is used for blocking line width according to described intersecting point coordinate and described inclination and judges the touch point coordinate.
7. multiple point touching recognition device according to claim 6 is characterized in that, described intersecting point coordinate computing module is further used for:
According to the data that infrared receiving tube on the longitudinal and transverse direction of touch-screen is blocked, ask for the line that detects the mid point of the infrared receiving tube that blocks continuously on the longitudinal and transverse direction respectively and obtain blocking the line center line on the longitudinal and transverse direction;
Ask for the intersecting point coordinate that obtains that blocks the line center line according to the joining of blocking the line center line on the described longitudinal and transverse direction then.
8. multiple point touching recognition device according to claim 6, it is characterized in that, described data and dip sweeping angle of blocking the infrared receiving tube that is blocked continuously when the line width computing module is further used for tilting infrared scan according to touch-screen asked for and tilted to block line width.
9. multiple point touching recognition device according to claim 6, it is characterized in that, described touch point judge module is further used for blocking line width according to described inclination and judges that whether described intersecting point coordinate blocks in the scope of line in the inclination that described inclination infrared scan obtains, if judge that then this intersecting point coordinate is the touch point coordinate.
10. multiple point touching recognition device according to claim 9, it is characterized in that, described touch point judge module is further used for blocking line width according to described inclination and asks for and tilt to block the line center line, calculate described intersecting point coordinate and described inclination and block distance between the line center line, the value of judging this distance whether greater than inclination block line width 1/2nd, if judge that this intersecting point coordinate is a non-touch point coordinate, if not, judge that then this intersecting point coordinate is the touch point coordinate.
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| CN 201110252672 CN102270071B (en) | 2011-08-30 | 2011-08-30 | Multi-point touch identification method and device |
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| CN102368185A (en) * | 2011-09-23 | 2012-03-07 | 广东威创视讯科技股份有限公司 | Identification method and device of touch points |
| CN102693048A (en) * | 2012-05-31 | 2012-09-26 | 安徽大学 | Infrared touch screen |
| CN103324431A (en) * | 2012-03-22 | 2013-09-25 | 义明科技股份有限公司 | Electronic device and control method thereof |
| CN103365480A (en) * | 2012-03-27 | 2013-10-23 | 北京汇冠新技术股份有限公司 | Touch recognition method and system for multi-point infrared touch screen |
| CN104182093A (en) * | 2014-08-04 | 2014-12-03 | 深圳市浪涛科技有限公司 | Multi-point touch recognition confirming method and system for infrared touch screen |
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| CN102368185A (en) * | 2011-09-23 | 2012-03-07 | 广东威创视讯科技股份有限公司 | Identification method and device of touch points |
| CN102368185B (en) * | 2011-09-23 | 2015-09-09 | 广东威创视讯科技股份有限公司 | The recognition methods of touch point and device |
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| CN104182093A (en) * | 2014-08-04 | 2014-12-03 | 深圳市浪涛科技有限公司 | Multi-point touch recognition confirming method and system for infrared touch screen |
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