CN104182093B - Multi-point touch recognition confirming method and system for infrared touch screen - Google Patents
Multi-point touch recognition confirming method and system for infrared touch screen Download PDFInfo
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- CN104182093B CN104182093B CN201410377891.2A CN201410377891A CN104182093B CN 104182093 B CN104182093 B CN 104182093B CN 201410377891 A CN201410377891 A CN 201410377891A CN 104182093 B CN104182093 B CN 104182093B
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Abstract
The invention discloses a multi-point touch recognition confirming method and system for an infrared touch screen. The method comprises the following steps: diagnosing positions of initial touch points on the infrared touch screen; calculating and obtaining first true and false evaluation degrees, second true and false evaluation degrees and third true and false evaluation degrees of the initial touch points; conducting weighted average on the first true and false evaluation degrees, the second true and false evaluation degrees and the third true and false evaluation degrees to obtain comprehensive true and false evaluation degrees; diagnosing whether the comprehensive true and false evaluation degrees of the initial touch points are higher than a pre-arranged value or not; confirming that the initial touch points are true touch points if the comprehensive true and false evaluation degrees are higher than the pre-arranged value; confirming that the initial touch points are false points if the comprehensive true and false evaluation degrees are not higher than the pre-arranged value. According to the invention, true and false evaluation degrees on three standards of the initial touch points are calculated respectively; threshold value extraction diagnosis is conducted after weighted average; multi-point touch recognition accuracy and response speed of the infrared touch screen are improved; stable fluency of touching of the infrared touch screen is improved.
Description
Technical field
The present invention relates to Infrared touch screen technology field, more particularly to a kind of multi-touch of infrared touch screen identification decision side
Method and system.
Background technology
Touch screen is used as a kind of new computer entry device so that man-machine interaction is more directly perceived, greatly facilitates use
The work and life at family, therefore, it is many that touch screen has been widely used for public information, business automation equipment, communication apparatus etc.
Individual field.
At present, existing infrared touch screen apparatus typically have two Nogatas of transverse direction and longitudinal direction infrared transmitting tube upwards
And infrared receiving tube, two-way infrared transmitting tube and infrared receiving tube collectively constitutes certain bit plane, by scanning successively laterally
And whether longitudinal direction above has infrared signal to be blocked and produces change between all corresponding infrared transmitting tubes and infrared receiving tube, and
Position is blocked according to infrared signal by computer to calculate the position coordinateses for determining touch point.When points are touched more than 1, can
Multiple points put and carry pseudo- point secretly can be formed, therefore recognizes that the real touch point of determination is particularly significant for touch screen work.
In multiple point touching, with touch points increase, the distance of distance between touch point, touch point translational speed
The factors such as quick change, existing infrared touch panel identification decision method response speed is slow, calculate time-consuming, effect on driving birds is not good, then adds
The upper hardware error of, the recognition accuracy for making true touch point itself is had a greatly reduced quality, or even the situation judged by accident can occur.
The content of the invention
The present invention proposes a kind of multi-touch of infrared touch screen identification decision method and system, and its simple structure, performance can
It is high by, fast response time and recognition accuracy, improve the stable fluency of infrared touch panel touch.
For achieving the above object, the present invention is adopted the following technical scheme that：
A kind of multi-touch of infrared touch screen identification decision method, comprises the following steps：
One infrared touch panel is provided, multiple infrared transmitting tubes of the frame of the infrared touch panel two is located at relatively and multiple red
Outer reception pipe；Start the plurality of infrared transmitting tube and multiple infrared receiving tubes be scanned, by detection be blocked it is multiple
Infrared receiving tube receives the position that signal judges initial touch point on the infrared touch panel；When judging the initial touch point
For multiple situations when, on the infrared touch panel choose comprising the initial touch point rectangular area, the rectangle region
Domain is constituted by the plurality of vertical curve is intersecting；
The area of the plurality of initial touch point is calculated, according to the maximum of the area of the plurality of initial touch point and most
Little value forms area linear and evaluates line, evaluates line computation according to the area linear and obtains the first of the plurality of initial touch point
True and false evaluating deg；Evaluated according to the coordinate position of the initial touch point former frame and its prediction coordinate forming position of a later frame
Curve, according to the position appraisal curve the second true and false evaluating deg of the plurality of initial touch point is calculated；Calculate not
With the area of the common factor of the figure of the plurality of initial touch point and union under coordinate system, and composition appraisal curve is formed, according to
The composition appraisal curve is calculated the 3rd true and false evaluating deg of the initial touch point；
First true and false evaluating deg of the initial touch point, the second true and false evaluating deg and the 3rd true and false evaluating deg are carried out to add
Weight average, obtains the comprehensive true and false evaluating deg of the initial touch point；Judge the comprehensive true and false evaluating deg of the initial touch point
Whether it is more than preset value, if so, then judges the initial touch point as true touch point；If it is not, then judging the initial touch
Point is pseudo- point for true touch point.
Further, it is described to be blocked by detection in above-mentioned multi-touch of infrared touch screen identification decision method
Multiple infrared receiving tubes receive signal and specifically include the step of judge the position of initial touch point on the infrared touch panel：
The position of initial touch point is obtained according to the infrared signal being blocked, judges that whether the initial touch point is
It is single, if so, then judge that the initial touch point, as true touch point, is calculated the coordinate figure of the true touch point.
Further, in above-mentioned multi-touch of infrared touch screen identification decision method, the area linear evaluates line
For：
U（s）=[S-S（j）]/[ S（i）- S（j）],
Wherein, S for initial touch point area, U（s）For the first true and false evaluating deg of initial touch point, S（i）For multiple
The Maximum Area of initial touch point, S（j）For the area minima of multiple initial touch points.
Further, it is described according to described initial tactile in above-mentioned multi-touch of infrared touch screen identification decision method
Touch a former frame coordinate position and its a later frame prediction coordinate forming position appraisal curve the step of specifically include：
The actual coordinate for recording the initial touch point former frame is P（x1,y1）, the prediction of the initial touch point a later frame
Coordinate is Q（x2,y2）, then the position appraisal curve of the initial touch point be：
；
Wherein, C is that two interframe tracking points move ultimate range, and K is default range of tolerable variance,Represent point P and point Q
Distance between the two.
Further, in above-mentioned multi-touch of infrared touch screen identification decision method, the calculating is in different coordinates
The area of the common factor of the figure of the plurality of initial touch point and union under system, and include the step of form composition appraisal curve：
Record multiple initial touch point gained figures and be respectively G1, G2, G3, try to achieve the common factor area of gained figureAnd the common factor area of gained figure, then obtain just
Beginning touch point composition appraisal curve：
。
Further, in above-mentioned multi-touch of infrared touch screen identification decision method, the preset value is 0.5.
Separately, the present invention also provides a kind of multi-touch of infrared touch screen identification decision system, including：One infrared touch panel,
With respect to the multiple infrared transmitting tubes and multiple infrared receiving tubes located at the frame of the infrared touch panel two, located at the infrared touch
Main control module in screen and it is connected to the data processing centre of the main control module；
The main control module is used to start the plurality of infrared transmitting tube and multiple infrared receiving tubes；
The data processing centre further includes：
Initial touch point judgment sub-unit, for judging described by the reception signal of the plurality of infrared receiving tube of detection
The position of initial touch point on infrared touch panel；
Scanning patter chooses subelement, for choosing the rectangle comprising the initial touch point on the infrared touch panel
Region, the rectangular area is constituted by the plurality of vertical curve is intersecting；
First true and false evaluating deg computation subunit, for calculating the area of the plurality of initial touch point, according to described many
The maximum of the area of individual initial touch point and minima form area linear and evaluate line, and according to the area linear line meter is evaluated
Calculation obtains the first true and false evaluating deg of the plurality of initial touch point；
The sub- computing unit of second true and false evaluating deg, for according to the coordinate position of the initial touch point former frame and thereafter
The prediction coordinate forming position appraisal curve of one frame, according to the position appraisal curve the plurality of initial touch point is calculated
The second true and false evaluating deg；
The sub- computing unit of 3rd true and false evaluating deg, for calculating the figure of the plurality of initial touch point under different coordinates
The common factor of shape and the area of union, and composition appraisal curve is formed, it is calculated according to the composition appraisal curve described initial
3rd true and false evaluating deg of touch point；
Comprehensive true and false evaluating deg computing unit, for by the first true and false evaluating deg, second true and false of the initial touch point
Evaluating deg and the 3rd true and false evaluating deg are weighted averagely, obtain the comprehensive true and false evaluating deg of the initial touch point；
True and false judgment sub-unit, for whether judging the comprehensive true and false evaluating deg of the initial touch point more than preset value,
If so, then judge the initial touch point as true touch point；If it is not, then judge the initial touch point as true touch point as
Pseudo- point.
Further, in above-mentioned multi-touch of infrared touch screen identification decision system, the area linear evaluates line
For：
U（s）=[S-S（j）]/[ S（i）- S（j）],
Wherein, S for initial touch point area, U（s）For the first true and false evaluating deg of initial touch point, S（i）For multiple
The Maximum Area of initial touch point, S（j）For the area minima of multiple initial touch points.
Further, in above-mentioned multi-touch of infrared touch screen identification decision system, the position appraisal curve is：
；
Wherein, P is the actual coordinate of the initial touch point former frame, and Q is the prediction coordinate of the initial touch point a later frame,
C is that two interframe tracking points move ultimate range, and K is default range of tolerable variance,Represent point P and point Q distance between the two.
1. further, in above-mentioned multi-touch of infrared touch screen identification decision system, the composition appraisal curve
For：
；
Wherein, A is the common factor area of multiple initial touch point gained figures, and B is multiple initial touch point gained figures
Union area.
Multi-touch of infrared touch screen identification decision method and system of the present invention are by the three of calculating initial touch point respectively
The true and false evaluating deg of individual standard, and carry out carrying out threshold value extraction judgement after weighted average again, it is many so as to improve infrared touch panel
The recognition accuracy of touch and response speed, improve the stable fluency of infrared touch panel touch.
Description of the drawings
Fig. 1 is the idiographic flow schematic diagram of multi-touch of infrared touch screen identification decision method of the present invention；
Fig. 2 is the structural representation of Fig. 1 mid-infrared touch screens；
Fig. 3 is the structural representation under the multiple point touching of Fig. 1 mid-infrared touch screens；
Fig. 4 is the schematic diagram that area linear evaluates line in Fig. 1；
Fig. 5 is the structural representation of multi-touch of infrared touch screen identification decision system of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
The invention provides a kind of multi-touch of infrared touch screen identification decision method, comprises the following steps：There is provided one red
Outer touch screen, relative multiple infrared transmitting tubes and multiple infrared receiving tubes located at the frame of the infrared touch panel two；Start institute
State multiple infrared transmitting tubes and multiple infrared receiving tubes are scanned, by detecting that the multiple infrared receiving tubes being blocked receive letter
Number judge the position of initial touch point on the infrared touch panel；When it is multiple situations to judge the initial touch point,
The rectangular area comprising the initial touch point is chosen on the infrared touch panel, the rectangular area is by the plurality of vertical
Line is intersecting to be constituted；The area of the plurality of initial touch point is calculated, according to the maximum of the area of the plurality of initial touch point
And minima forms area linear and evaluates line, line computation is evaluated according to the area linear and obtains the plurality of initial touch point
First true and false evaluating deg；Formed according to the coordinate position of the initial touch point former frame and its coordinate prediction coordinate of a later frame
Position appraisal curve, according to the position appraisal curve the second true and false evaluating deg of the plurality of initial touch point is calculated；
The area of the common factor of the figure of the plurality of initial touch point and union under different coordinates is calculated, and forms composition and evaluate bent
Line, according to the composition appraisal curve the 3rd true and false evaluating deg of the initial touch point is calculated；By the initial touch
The first true and false evaluating deg, the second true and false evaluating deg and the 3rd true and false evaluating deg put is weighted averagely, obtains described initial tactile
Touch comprehensive true and false evaluating deg a little；Whether the comprehensive true and false evaluating deg for judging the initial touch point is more than preset value, if so, then
Judge the initial touch point as true touch point；If it is not, then to judge the initial touch point be true touch point as pseudo- point.This
Sample, the true and false evaluating deg of three standards by calculating initial touch point respectively, and carry out carrying out threshold value after weighted average again carrying
Judgement is taken, so as to improve recognition accuracy and the response speed of multi-touch of infrared touch screen, infrared touch panel is improve and is touched
The stable fluency touched.
Fig. 1 to Fig. 4 is referred to, Fig. 1 is that the idiographic flow of multi-touch of infrared touch screen identification decision method of the present invention shows
It is intended to；The method comprising the steps of：
Step S11：One infrared touch panel 100, multiple infrared transmitting tubes 10 and multiple infrared receiving tubes 20 are provided, it is described many
, located at the first frame of the infrared touch panel 100, the plurality of infrared receiving tube 20 is located at described red for individual infrared transmitting tube 10
Second frame of outer touch screen 100, first frame is oppositely arranged with the second frame；
By infrared transmitting tube as a example by corresponding three infrared receiving tubes illustrating its position distribution relation.It is described transversely
Frame 102 is provided with a certain infrared transmitting tube 10, and the horizontal lower frame 104 is provided with corresponding with the infrared transmitting tube 10
One infrared receiving tube 202, the second infrared receiving tube 204 and the 3rd infrared receiving tube 206, first infrared receiving tube 202 sets
In the underface of the infrared transmitting tube 10, second infrared receiving tube 204 is located at a left side for first infrared receiving tube 202
Side, the 3rd infrared receiving tube 206 is located at the right of first infrared receiving tube 202, second infrared receiving tube 204
And the 3rd infrared receiving tube 206 be symmetric with regard to the first infrared receiving tube 202.
Wherein, it is formed with vertical curve I between the infrared receiving tube 202 of the infrared transmitting tube 10 and first, described infrared
The first oblique line II that "Left"-deviationist is formed between the infrared receiving tube 204 of pipe 10 and second is penetrated, the infrared transmitting tube 10 is red with the 3rd
The second oblique line III of Right deviation is formed between outer reception pipe 206；It is similar, corresponding three of each infrared transmitting tube
Multiple vertical curves, the first oblique line and the second oblique line are each formed between infrared receiving tube.
Step S12：Start the transmitting infrared signal of the plurality of infrared transmitting tube 10, detect the plurality of infrared receiving tube 20
Whether the infrared signal for receiving is blocked, and if so, then carries out step S13；If it is not, then detecting the plurality of infrared receiver again
The infrared signal that pipe 20 is received；
When implementing, also include before step S12：There is not touch signal defeated in the infrared touch panel 100
It is fashionable, start the plurality of infrared transmitting tube 10 and launch infrared signal, detect and record the plurality of infrared receiving tube 20 and receive
The infrared signal for arriving.So, when there is the infrared touch panel 100 to be touched, that is, when having touch signal to be input into, by relatively more described
The change of the infrared signal intensity that multiple infrared receiving tubes 20 are received, can determine whether whether infrared touch panel 100 has touch signal
Input.
Step S13：The position of initial touch point 30 is obtained according to the infrared signal being blocked, judges described initial tactile
Whether a little 30 be single, if so, then judge that the initial touch point, as true touch point, is calculated the seat of the true touch point if touching
Scale value；If it is not, then carrying out step S14；
When implementing, when the certain point of infrared touch panel 100 is touched, the plurality of infrared receiving tube 20 is received
Infrared signal intensity change, i.e., described infrared touch panel 100 blocks the initial touch point 30 of formation because of touch, due to
The plurality of infrared transmitting tube 10 is corresponding relation with the signal transmitting and reception of infrared receiving tube 20, can be blocked according to described
Infrared signal obtain the position of initial touch point；Then, need judgement to be single-point or multiple point touching, that is, judge described initial
Whether touch point is single, and if so, as single-touch, need not now carry out the step of screening pseudo- point below, you can judging should
Single initial touch point is true touch point, and is calculated the coordinate figure of the true touch point；If it is not, as multiple point touching,
Need the position for determining whether true touch point.
Step S14：The rectangular area 40 comprising the initial touch point 30, institute are chosen on the infrared touch panel 100
State rectangular area 40 to be constituted by the plurality of vertical curve is intersecting；
When implementing, the initial touch point 30 obtained in step S13 is entirely not true touch point, and it can
Fict pseudo- point can be included, it is therefore desirable to further screen out pseudo- point, can just find true touch point.The present invention is logical
Cross and choose multiple rectangular areas 40, the rectangular area 40 can just include the initial touch point 30, or more initial than described
The scope of touch point 30 is slightly larger, you can include into and be contracted to certain sweep limitss by the initial touch point 30.
Step S15：The area of the plurality of initial touch point 30 is calculated, area linear is obtained and is evaluated line, according to the face
Product linear evaluation line computation obtains the first true and false evaluating deg of the plurality of initial touch point；
When implementing, the Maximum Area S of the plurality of initial touch point 30 is obtained（i）And area minima S
（j）, with the Maximum Area S（i）First true and false evaluating deg of corresponding initial touch point is 1, with area minima S（j）
First true and false evaluating deg of corresponding initial touch point is 0, obtains area linear evaluation line and is：
U（s）=[S-S（j）]/[ S（i）- S（j）]（1）,
Wherein, S for initial touch point area, U（s）For the first true and false evaluating deg of initial touch point.
The area of the initial touch point for obtaining is substituted into into the formula that area linear evaluates line（1）In, you can obtain this initial
First true and false evaluating deg of touch point, generally the first true and false evaluating deg of the initial touch point are less than 1 more than 0.
Step S16：Position is formed according to the actual coordinate of the initial touch point former frame and its prediction coordinate of a later frame
Appraisal curve is put, the second true and false evaluating deg of the plurality of initial touch point is calculated according to the position appraisal curve；
When implementing, the actual coordinate for recording the initial touch point former frame is P（x1,y1）, the initial touch point
The prediction coordinate of a later frame is Q（x2,y2）, then the position appraisal curve of the initial touch point be：
；
Wherein, C is that two interframe tracking points move ultimate range, and half is set to 5 or so, has 100 frames if per second, such one
Movable distance is up to 500 fluorescent tube distances in second, it is contemplated that practicality takes 5 can.K be default range of tolerable variance, its scope
In [0,1],Point P and point Q distance between the two is represented,The position appraisal curve of the initial touch point is represented, this is commented
Valency degree puts true point range under more than K person, otherwise puts pseudo- point range under.
Frame position coordinate before and after the initial touch point for obtaining is substituted in the formula of position appraisal curve, you can be somebody's turn to do
Second true and false evaluating deg of initial touch point, generally the second true and false evaluating deg of the initial touch point are less than 1 more than 0.
Step S17：The area of the common factor of the figure of the plurality of initial touch point and union under different coordinates is calculated,
And composition appraisal curve is formed, the 3rd true and false evaluation of the initial touch point is calculated according to the composition appraisal curve
Degree；
When implementing, record multiple initial touch point gained figures and be respectively G1, G2, G3, try to achieve G1 ∩ G2 ∩ G3
AreaAnd the area of G1 ∪ G2 ∪ G3, then
To the composition appraisal curve of initial touch point P：
；
By in the formula of the common factor of initial touch dot pattern and the area of union that obtain for composition appraisal curve, you can
To the 3rd true and false evaluating deg of the initial touch point, generally the 3rd true and false evaluating deg of the initial touch point is less than 1 more than 0.
Initial touch pointShow that the jiao zi figure of three subgraphs is bigger with simultaneously subgraph, then it is the probability of true point
It is bigger.
Step S18：By the first true and false evaluating deg of the initial touch point, the second true and false evaluating deg and the 3rd true and false evaluation
Degree is weighted averagely, obtains the comprehensive true and false evaluating deg of the initial touch point.
When implementing, by by the first true and false evaluating deg of the initial touch point for obtaining, the second true and false evaluation
Degree and the 3rd true and false evaluating deg ask for average, as final evaluation of estimate, synthetic determination had so both been capable of achieving, to each frame
Possibility touch point, improve accuracy, reduce erroneous judgement.Here average can be weighted mean, and the weight of its three can
According to influence degree is obtained to the performance of touch screen with reference to factor, different flexible strategy are set.For example the first true and false evaluating deg M weights are
0.4th, the second true and false evaluating deg N weights are that the 0.4, the 3rd true and false evaluating deg L weights are 0.2, then the synthesis of the initial touch point
True and false evaluating deg Y=0.4*M+0.4*N+0.2*L.
Step S19：Judge that the comprehensive true and false evaluating deg of the initial touch point, whether more than preset value, if so, then judges
The initial touch point is true touch point；If it is not, then to judge the initial touch point be true touch point as pseudo- point.
When implementing, the generally preset value is taken as 0.5, therefore, the comprehensive true and false for judging the initial touch point is commented
Whether valency degree is more than 0.5, if so, then judges the initial touch point as true touch point；If it is not, then judging the initial touch
Point is pseudo- point for true touch point.
Separately, Fig. 5 is referred to, the invention provides a kind of multi-touch of infrared touch screen identification decision system, including one red
Outer touch screen 100, relative multiple infrared transmitting tubes 10 and multiple infrared receiving tubes located at 100 liang of frames of the infrared touch panel
20th, in the infrared touch panel 100 main control module 300 and it is connected to the data processing centre of the main control module 300
400；
The main control module 300 is used to start the plurality of infrared transmitting tube 10 and multiple infrared receiving tubes 20；
The data processing centre 400 further includes：
Initial touch point judgment sub-unit 401, for by detecting that the reception signal of the plurality of infrared receiving tube 20 is sentenced
The position of initial touch point on the disconnected infrared touch panel 100；
Scanning patter chooses subelement 402, and for choosing on the infrared touch panel 100 initial touch point is included
Rectangular area, the rectangular area is constituted by the plurality of vertical curve is intersecting；
First true and false evaluating deg computation subunit 403, for calculating the area of the plurality of initial touch point, according to described
The maximum of the area of multiple initial touch points and minima form area linear and evaluate line, and according to the area linear line is evaluated
It is calculated the first true and false evaluating deg of the plurality of initial touch point；
The sub- computing unit 404 of second true and false evaluating deg, for according to the coordinate position of the initial touch point former frame and
The prediction coordinate forming position appraisal curve of its a later frame, is calculated the plurality of initial tactile according to the position appraisal curve
Touch the second true and false evaluating deg a little；
The sub- computing unit 405 of 3rd true and false evaluating deg, for calculating the plurality of initial touch point under different coordinates
Figure common factor and the area of union, and composition appraisal curve is formed, according to the composition appraisal curve is calculated
3rd true and false evaluating deg of initial touch point；
Comprehensive true and false evaluating deg computing unit 406, for by the first true and false evaluating deg of the initial touch point, second true
Pseudo- evaluating deg and the 3rd true and false evaluating deg are weighted averagely, obtain the comprehensive true and false evaluating deg of the initial touch point；
True and false judgment sub-unit 407, for judging the comprehensive true and false evaluating deg of the initial touch point whether more than default
Value, if so, then judges the initial touch point as true touch point；If it is not, then judging the initial touch point as actual touch
Point is pseudo- point.
The area linear evaluates line：
U（s）=[S-S（j）]/[ S（i）- S（j）],
Wherein, S for initial touch point area, U（s）For the first true and false evaluating deg of initial touch point, S（i）For multiple
The Maximum Area of initial touch point, S（j）For the area minima of multiple initial touch points.
The position appraisal curve is：
；
Wherein, P is the actual coordinate of the initial touch point former frame, and Q is the prediction coordinate of the initial touch point a later frame,
C be two interframe tracking points move ultimate range, half is set to 5 or so, if per second have 100 frames, in such one second may move away from
From up to a distance from 500 fluorescent tubes, it is contemplated that practicality takes 5 can.K be default range of tolerable variance, its scope in [0,1],Point P and point Q distance between the two is represented, this evaluating deg puts true point range under more than K person, otherwise puts pseudo- point range under.
The composition appraisal curve is：
；
Wherein, A is the common factor area of gained figure, i.e.,；B be gained figure and
Collection area, i.e.,, G1, G2, G3 are multiple initial touch points gained figure.
Compared to prior art, multi-touch of infrared touch screen identification decision method and system of the present invention are by calculating respectively
The true and false evaluating deg of three standards of initial touch point, and carry out carrying out threshold value extraction judgement after weighted average again, so as to improve
The recognition accuracy of multi-touch of infrared touch screen and response speed, improve the stable fluency of infrared touch panel touch.
Here description of the invention and application are illustrative, are not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein is possible, real for those skilled in the art
The replacement and equivalent various parts for applying example is known.It should be appreciated by the person skilled in the art that without departing from the present invention
Spirit or essential characteristics in the case of, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and part are realizing.In the case of without departing from scope and spirit of the present invention, embodiments disclosed herein can be entered
Other deformations of row and change.
Claims (10)
1. a kind of multi-touch of infrared touch screen identification decision method, it is characterised in that the method comprising the steps of：
One infrared touch panel, relative multiple infrared transmitting tubes located at the frame of the infrared touch panel two are provided and multiple infrared are connect
Closed tube；Start the plurality of infrared transmitting tube and multiple infrared receiving tubes be scanned, by detection be blocked it is multiple infrared
Reception pipe receives the position that signal judges initial touch point on the infrared touch panel；When judging that the initial touch point is many
During individual situation, choose the rectangular area comprising the initial touch point on the infrared touch panel, the rectangular area by
Multiple vertical curves are intersecting to be constituted；
The area of multiple initial touch points is calculated, according to the maximum and minima of the area of multiple initial touch points
Form area linear and evaluate line, first true and false that line computation obtains multiple initial touch points is evaluated according to the area linear
Evaluating deg；Evaluate bent according to the coordinate position of the initial touch point former frame and its prediction coordinate forming position of a later frame
Line, according to the position appraisal curve the second true and false evaluating deg of multiple initial touch points is calculated；Calculate in difference
The common factor and the area of union of the figure of multiple initial touch points under coordinate system, and composition appraisal curve is formed, according to institute
State the 3rd true and false evaluating deg that composition appraisal curve is calculated the initial touch point；
First true and false evaluating deg of the initial touch point, the second true and false evaluating deg and the 3rd true and false evaluating deg are weighted flat
, the comprehensive true and false evaluating deg of the initial touch point is obtained；Whether judge the comprehensive true and false evaluating deg of the initial touch point
More than preset value, if so, then judge the initial touch point as true touch point；If it is not, then judge the initial touch point as
True touch point is pseudo- point.
2. multi-touch of infrared touch screen identification decision method according to claim 1, it is characterised in that
It is described to judge initial touch on the infrared touch panel by detecting that the multiple infrared receiving tubes being blocked receive signal
The step of position of point, specifically includes：
The position of initial touch point is obtained according to the infrared signal being blocked, judges whether the initial touch point is single
It is individual, if so, then judge that the initial touch point, as true touch point, is calculated the coordinate figure of the true touch point.
3. multi-touch of infrared touch screen identification decision method according to claim 2, it is characterised in that the area line
Property evaluate line be：
U (s)=[S-S (j)]/[S (i)-S (j)],
Wherein, S is the area of initial touch point, and U (s) is the first true and false evaluating deg of initial touch point, and S (i) is multiple initial
The Maximum Area of touch point, S (j) is the area minima of multiple initial touch points.
4. multi-touch of infrared touch screen identification decision method according to claim 1, it is characterised in that
It is described to evaluate bent according to the coordinate position of the initial touch point former frame and its prediction coordinate forming position of a later frame
The step of line, specifically includes：
The actual coordinate for recording the initial touch point former frame is P（x1,y1）, the prediction coordinate of the initial touch point a later frame
For Q（x2,y2）, then the position appraisal curve of the initial touch point be：
；
Wherein, C is that two interframe tracking points move ultimate range, and K is default range of tolerable variance,Represent both point P and point Q it
Between distance.
5. multi-touch of infrared touch screen identification decision method according to claim 1, it is characterised in that
The common factor and the area of union of calculating figure of multiple initial touch points under different coordinates, and form structure
The step of figure appraisal curve, includes：
Record multiple initial touch point gained figures and be respectively G1, G2, G3, try to achieve the common factor area of gained figureAnd the common factor area of gained figure, then obtain initial
The composition appraisal curve of touch point：
。
6. multi-touch of infrared touch screen identification decision method according to claim 1, it is characterised in that the preset value
For 0.5.
7. a kind of multi-touch of infrared touch screen identification decision system, it is characterised in that include：It is one infrared touch panel, relative
Multiple infrared transmitting tubes and multiple infrared receiving tubes located at the frame of the infrared touch panel two, in the infrared touch panel
Main control module and be connected to the data processing centre of the main control module；
The main control module is used to start the plurality of infrared transmitting tube and multiple infrared receiving tubes；
The data processing centre further includes：
Initial touch point judgment sub-unit, for judging described infrared by the reception signal of the plurality of infrared receiving tube of detection
The position of initial touch point on touch screen；
Scanning patter chooses subelement, for choosing the rectangle region comprising the initial touch point on the infrared touch panel
Domain, the rectangular area is constituted by multiple vertical curves are intersecting；
First true and false evaluating deg computation subunit, for calculating the area of multiple initial touch points, according to multiple described first
Beginning touch point area maximum and minima formed area linear evaluate line, according to the area linear evaluate line computation obtain
To the first true and false evaluating deg of multiple initial touch points；
The sub- computing unit of second true and false evaluating deg, for according to the coordinate position and its a later frame of the initial touch point former frame
Prediction coordinate forming position appraisal curve, be calculated the of multiple initial touch points according to the position appraisal curve
Two true and false evaluating degs；
The sub- computing unit of 3rd true and false evaluating deg, for calculating the figure of multiple initial touch points under different coordinates
The area of common factor and union, and composition appraisal curve is formed, the initial touch is calculated according to the composition appraisal curve
3rd true and false evaluating deg of point；
Comprehensive true and false evaluating deg computing unit, for by the first true and false evaluating deg of the initial touch point, the second true and false evaluation
Degree and the 3rd true and false evaluating deg are weighted averagely, obtain the comprehensive true and false evaluating deg of the initial touch point；
True and false judgment sub-unit, for judging whether the comprehensive true and false evaluating deg of the initial touch point is more than preset value, if so,
Then judge the initial touch point as true touch point；If it is not, then to judge the initial touch point be true touch point as pseudo- point.
8. multi-touch of infrared touch screen identification decision system according to claim 7, it is characterised in that the area line
Property evaluate line be：
U (s)=[S-S (j)]/[S (i)-S (j)],
Wherein, S is the area of initial touch point, and U (s) is the first true and false evaluating deg of initial touch point, and S (i) is multiple initial
The Maximum Area of touch point, S (j) is the area minima of multiple initial touch points.
9. multi-touch of infrared touch screen identification decision system according to claim 7, it is characterised in that comment the position
Valency curve is：
；
Wherein, P is the actual coordinate of the initial touch point former frame, and Q is the prediction coordinate of the initial touch point a later frame, and C is
Two interframe tracking points move ultimate range, and K is default range of tolerable variance,Represent point P and point Q distance between the two.
10. multi-touch of infrared touch screen identification decision system according to claim 7, it is characterised in that the composition
Appraisal curve is：
；
Wherein, A is the common factor area of multiple initial touch point gained figures, and B is the union of multiple initial touch point gained figures
Area.
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