CN104182091B - Multi-point touch recognition method and system for infrared touch screen - Google Patents
Multi-point touch recognition method and system for infrared touch screen Download PDFInfo
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- CN104182091B CN104182091B CN201410377637.2A CN201410377637A CN104182091B CN 104182091 B CN104182091 B CN 104182091B CN 201410377637 A CN201410377637 A CN 201410377637A CN 104182091 B CN104182091 B CN 104182091B
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Abstract
The invention discloses a multi-point touch recognition method and system for an infrared touch screen. The method comprises the following steps: providing an infrared touch screen, a plurality of infrared transmitting pipes and a plurality of infrared receiving pipes; diagnosing positions of touch notches on the infrared touch screen; selecting a rectangle area and a square unit containing the touch notches on the infrared touch screen; diagnosing and obtaining all possible touch points in the rectangle area through the square unit; removing fake points existing in the possible touch points by examining the possible touch points; calculating and obtaining coordinate values of the real touch points. According to the invention, the rectangle area and the square unit are adopted for sweeping to screen possible fake points out; all the possible touch points are conducted by examination; sweep time of the infrared transmitting pipes and the infrared receiving pipes is shortened; response speed and positioning accuracy of the infrared touch screen are improved; multi-point touch recognition accuracy of the infrared touch screen is improved.
Description
Technical field
The present invention relates to Infrared touch screen technology field, particularly to a kind of multi-touch of infrared touch screen recognition methods and
System.
Background technology
Touch-screen greatly facilitates use as a kind of new computer entry device so that man-machine interaction is more directly perceived
The work at family and life, 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 constitute certain bit plane, by scanning successively laterally
And longitudinally above whether have infrared signal to be blocked between all corresponding infrared transmitting tubes and infrared receiving tube and produce change, and
By computer according to infrared signal be blocked position calculate determine touch point position coordinates.When touching points more than 1, can
Can form the point that multiple points carry pseudo- point secretly, therefore identify that the real touch point of determination works for touch-screen particularly significant.
However, above-mentioned touch points of infrared touch screen recognition methods is usually only limitted to single-point or two touch, and for super
Cross the touch point situation of two, its control is relative complex, data redundancy, to calculate time-consuming, response speed slow, and has influence on infrared
Touch the precision of positioning.
Content of the invention
The present invention proposes a kind of multi-touch of infrared touch screen recognition methods and system, and its structure is simple, dependable performance, sound
Answer speed fast and positioning precision is high, improve the stable fluency of infrared touch panel touch.
For achieving the above object, the present invention adopts the following technical scheme that：
A kind of multi-touch of infrared touch screen recognition methods, comprises the following steps：
One infrared touch panel is provided, relatively located at multiple infrared transmitting tubes of described infrared touch panel two frame and multiple red
Outer reception pipe, the plurality of infrared transmitting tube and multiple infrared receiving tube are all placed equidistant, each infrared transmitting tube corresponding three
Individual infrared receiving tube, each infrared receiving tube corresponds to three infrared transmitting tubes, and the plurality of infrared transmitting tube is red with corresponding
It is formed with the second oblique line of multiple vertical curves, the first left-leaning oblique line and Right deviation between outer reception pipe；
Start the plurality of infrared transmitting tube and multiple infrared receiving tube be scanned, by detection be blocked multiple red
Outer reception pipe receipt signal is judged to touch the position of breach on described infrared touch panel；When judge described touch breach be multiple
Situation when, described infrared touch panel is chosen comprise described touch the rectangular area of breach and square shaped cells, described
Rectangular area and square shaped cells are constituted by the plurality of vertical curve is intersecting；
It is scanned in described rectangular area for basic scanning element with described square shaped cells, judge the plurality of perpendicular
Straight line, the first oblique line or the second oblique line whether by the arbitrary sub- triangle screening area in described square shaped cells, described sub three
With four summits of this square shaped cells as right-angled apices, it is vertical in described square shaped cells if so, then to judge for angular screening area
The crosspoint that line, the first oblique line and the second oblique line are crossed to form is pseudo- point；If it is not, then judge vertical in described square shaped cells
The crosspoint that line, the first oblique line and the second oblique line are crossed to form is possible touch point；
Repeat above-mentioned screening decision process in described rectangular area, until obtaining all of possible touch point；
Remove pseudo- point present in this possibility touch point by checking described possible touch point, be calculated true touch point
Coordinate value.
Further, in above-mentioned multi-touch of infrared touch screen recognition methods, described by detection be blocked many
Individual infrared receiving tube receipt signal judges that the step touching the position of breach on described infrared touch panel specifically includes：
Obtain the position touching breach according to the described infrared signal being blocked, judge whether described touch breach is single
Individual, if so, then judge that this touch breach, as true touch point, is calculated the coordinate value of this true touch point.
Further, in above-mentioned multi-touch of infrared touch screen recognition methods, the face of described sub- triangle screening area
Amass 1/8 for described square shaped cells area.
Further, in above-mentioned multi-touch of infrared touch screen recognition methods, described obtain in described rectangular area
Also include after the step of be possible to touch point：
Judge whether the plurality of vertical curve, the first oblique line or the second oblique line are single by square in described rectangular area
Unit in all of sub- triangle screening area, described sub- triangle screening area with four summits of square shaped cells as right-angled apices,
If so, then judge the intersection that the vertical curve in described square shaped cells, the first oblique line and the second oblique line are crossed to form
Point is pseudo- point；If it is not, then judging the intersection that the vertical curve in described square shaped cells, the first oblique line and the second oblique line are crossed to form
Point is possible touch point；
Repeat the above steps, obtain all of possible touch point in rectangular area.
Further, in above-mentioned multi-touch of infrared touch screen recognition methods, described described may be touched by checking
Touch and remove pseudo- point present in this possibility touch point, the step being calculated the coordinate value of true touch point also includes：
Neighbouring point in the described possible touch point obtaining is connected into line segment or rectangle, judges described line segment or rectangle
Central point is to merge touch point, removes pseudo- point present in this merging touch point by described merging touch point, is calculated true
The coordinate value of real touch point.
Separately, the present invention also provides a kind of multi-touch of infrared touch screen identifying system, including：One infrared ray
Touch-screen, relative multiple infrared transmitting tubes located at described infrared touch panel two frame and multiple infrared receiving tube,
Main control module in described infrared touch panel and the data processing centre being connected to described main control module；Each infrared
Penetrate pipe and correspond to three infrared receiving tubes, each infrared receiving tube corresponds to three infrared transmitting tubes；The plurality of infrared transmitting tube
It is formed with the second oblique line of multiple vertical curves, the first left-leaning oblique line and Right deviation between corresponding infrared receiving tube；
Described main control module is used for starting the plurality of infrared transmitting tube and multiple infrared receiving tube；
Described data processing centre further includes：
Touch breach judgment sub-unit, judge for the receipt signal by detecting the plurality of infrared receiving tube described red
The position of breach is touched on outer touch-screen；
Scanning patter chooses subelement, comprises the described rectangle region touching breach for choosing on described infrared touch panel
Domain and square shaped cells, described rectangular area and square shaped cells are constituted by the plurality of vertical curve is intersecting, described pros
The length of side of shape unit is the spacing between adjacent two infrared transmitting tubes or infrared receiving tube；
Possible touch point computation subunit, for described square shaped cells for basic scanning element in described rectangular area
Inside it is scanned, judge the plurality of vertical curve, the first oblique line or the second oblique line whether by appointing in described square shaped cells
One sub- triangle screening area, described sub- triangle screening area, with four summits of this square shaped cells as right-angled apices, is if so, then sentenced
The crosspoint that vertical curve in fixed described square shaped cells, the first oblique line and the second oblique line are crossed to form is pseudo- point；If it is not, then sentencing
The crosspoint that vertical curve in fixed described square shaped cells, the first oblique line and the second oblique line are crossed to form is possible touch point；
True touch point computation subunit, for being existed by checking described possible touch point to remove in this possibility touch point
Pseudo- point, be calculated the coordinate value of true touch point.
Further, in above-mentioned multi-touch of infrared touch screen identifying system, the face of described sub- triangle screening area
Amass 1/8 for described square shaped cells area.
Further, in above-mentioned multi-touch of infrared touch screen identifying system, described data processing centre
Also include：
Merge touch point computation subunit, for by neighbouring point in the described possible touch point obtaining connect into line segment or
Rectangle, judges the central point of described line segment or rectangle as merging touch point；
Described true touch point computation subunit is additionally operable to be removed in this merging touch point by described merging touch point and deposits
Pseudo- point, be calculated the coordinate value of true touch point.
Multi-touch of infrared touch screen recognition methods of the present invention and system are passed through, using monolateral asymmetric diagonal scan, to contract
The sweep time of short infrared transmitting tube and infrared receiving tube, improve the scan frequency of infrared touch panel, response speed and fixed
Position precision, thus improve the stable fluency that infrared touch panel positioning touches.
Brief description
Fig. 1 is the idiographic flow schematic diagram of multi-touch of infrared touch screen recognition methods of the present invention；
Fig. 2 is the structural representation of Fig. 1 mid-infrared touch-screen；
Fig. 3 is the structural representation under the multiple point touching of Fig. 1 mid-infrared touch-screen；
Fig. 4 is the schematic diagram of square shaped cells and sub- triangle screening area in Fig. 1；
Fig. 5 is the structural representation of possible touch point in Fig. 1 mid-infrared touch-screen；
Fig. 6 is the structural representation of true touch point in Fig. 1 mid-infrared touch-screen；
Fig. 7 is the structural representation of multi-touch of infrared touch screen identifying system of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order 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 recognition methods, comprise the following steps：There is provided one infrared touch
Touch screen, relative multiple infrared transmitting tubes located at described infrared touch panel two frame and multiple infrared receiving tube, the plurality of red
Emission pipe and multiple infrared receiving tube are all placed equidistant, and each infrared transmitting tube corresponds to three infrared receiving tubes, each
Infrared receiving tube corresponds to three infrared transmitting tubes, is formed with many between the plurality of infrared transmitting tube and corresponding infrared receiving tube
Second oblique line of individual vertical curve, the first left-leaning oblique line and Right deviation；Start the plurality of infrared transmitting tube and multiple infrared receiver
Pipe is scanned, and is lacked by detecting that the multiple infrared receiving tube receipt signals being blocked are judged to touch on described infrared touch panel
The position of mouth；When judging that described touch breach is multiple situations, described infrared touch panel is chosen and comprises described touch
The rectangular area of breach and square shaped cells, described rectangular area and square shaped cells intersect structure by the plurality of vertical curve
Become, the length of side of described square shaped cells is the spacing between adjacent two infrared transmitting tubes or infrared receiving tube；With described square
Unit is scanned in described rectangular area for basic scanning element, judges the plurality of vertical curve, the first oblique line or second
Whether, by the arbitrary sub- triangle screening area in described square shaped cells, described sub- triangle screening area is with this square for oblique line
Four summits of unit are right-angled apices, if so, then judge vertical curve in described square shaped cells, the first oblique line and the second oblique line
The crosspoint being crossed to form is pseudo- point；If it is not, then judging the vertical curve in described square shaped cells, the first oblique line and the second oblique line
The crosspoint being crossed to form is possible touch point；Repeat above-mentioned screening decision process in described rectangular area, until obtaining institute
Some possibility touch points；Remove pseudo- point present in this possibility touch point by checking described possible touch point, be calculated true
The coordinate value of real touch point.So, by being scanned screening out puppet that may be present using rectangular area and square shaped cells
Point, and is tested in all of possible touch point, shorten the sweep time of infrared transmitting tube and infrared receiving tube, improve
Infrared touch screen response speed and positioning precision, thus improve the accuracy of multi-touch of infrared touch screen identification.
Refer to Fig. 1 to Fig. 4, Fig. 1 is the idiographic flow schematic diagram of multi-touch of infrared touch screen recognition methods of the present invention；
The method comprising the steps of：
Step S11：One infrared touch panel 100, multiple infrared transmitting tube 10 and multiple infrared receiving tube 20 are provided, described many
, located at the first frame of described 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, described first frame and the second frame are oppositely arranged, the plurality of infrared transmitting tube 10 and many
Individual infrared receiving tube 20 is all placed equidistant；Each infrared transmitting tube 10 corresponds to three infrared receiving tubes 20, and each is infrared to connect
Closed tube 20 corresponds to three infrared transmitting tubes 10；
When implementing, described infrared touch panel 100 is rectangular touch screen, and it includes two groups of frames being oppositely arranged,
Illustrate below taking horizontal frame as a example.
Described infrared touch panel 100 is transversely（X-axis）It is relatively set with horizontal upper side frame 102 and horizontal lower frame 104, institute
State multiple infrared transmitting tubes 10 located at horizontal upper side frame 102, the plurality of infrared receiving tube 20 is located at horizontal lower frame 104.Institute
State multiple infrared transmitting tubes 10 and multiple infrared receiving tube 20 is all placed equidistant, be i.e. two adjacent infrared transmitting tubes 10 or infrared connect
Between closed tube 20, spacing is identical.
Described infrared touch panel 100 is longitudinally（Y-axis）The structure of frame is identical, will not be described here, i.e. infrared of the present invention
Penetrate pipe 10 and infrared receiving tube 20 adopts horizontal, longitudinal bilateral symmetry scanning.
The plurality of infrared transmitting tube 10 and infrared receiving tube 20 are all the correspondences of mutual one-to-many, and that is, each infrared connects
Closed tube 20 can receive the infrared signal that multiple infrared transmitting tubes send, and it is infrared that each infrared transmitting tube 10 can send multichannel
Signal is to different infrared receiving tubes 20.In the present invention, each infrared transmitting tube 10 corresponds to three infrared receiving tubes 20, each
Individual infrared receiving tube 20 corresponds to three infrared transmitting tubes 10.
Its position distribution relation is illustrated as a example corresponding three infrared receiving tubes by infrared transmitting tube.Described transversely
Frame 102 is provided with a certain infrared transmitting tube 10, and described horizontal lower frame 104 is provided with corresponding with this infrared transmitting tube 10
One infrared receiving tube 202, the second infrared receiving tube 204 and the 3rd infrared receiving tube 206, described first infrared receiving tube 202 sets
In the underface of described infrared transmitting tube 10, described second infrared receiving tube 204 is located at a left side for described first infrared receiving tube 202
Side, described 3rd infrared receiving tube 206 is located at the right of described first infrared receiving tube 202, described 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 described infrared transmitting tube 10 and the first infrared receiving tube 202, described infrared
Penetrate the first oblique line II being formed with "Left"-deviationist between pipe 10 and the second infrared receiving tube 204, described infrared transmitting tube 10 is red with the 3rd
It is formed with the second oblique line III of Right deviation between outer reception pipe 206；Similar, corresponding three of each infrared transmitting tube
It is each formed with multiple vertical curves, the first oblique line and the second oblique line between infrared receiving tube.
In the same manner, corresponding three infrared transmitting tubes 10 of each infrared receiving tube 20 are also to be symmetric, and, each
It is also formed with multiple vertical curves, the first oblique line and second oblique between corresponding three infrared transmitting tubes 10 of individual infrared receiving tube 20
Line.
Step S12：Start the plurality of infrared transmitting tube 10 transmitting infrared signal, detect the plurality of infrared receiving tube 20
Whether the infrared signal receiving is blocked, and if so, then carries out step S13；If it is not, then again detecting the plurality of infrared receiver
The infrared signal that pipe 20 receives；
When implementing, also include before described step S12：There is not touch signal defeated in described infrared touch panel 100
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 arriving.So, when there being described infrared touch panel 100 to be touched, that is, when having touch signal input, by relatively more described
The change of the infrared signal intensity that multiple infrared receiving tubes 20 receive, can determine whether whether infrared touch panel 100 has touch signal
Input.
Step S13：Obtain the position touching breach 30 according to the described infrared signal being blocked, judge described touch breach
Whether 30 be single, if so, then judges that this touch breach, as true touch point, is calculated the coordinate value of this true touch point；
If it is not, then carrying out step S14；
When implementing, when infrared touch panel 100 certain point is touched, the plurality of infrared receiving tube 20 receives
Infrared signal intensity change, that is, described infrared touch panel 100 blocks the touch breach 30 of formation because of touch, by institute
The signal transmitting stating multiple infrared transmitting tubes 10 with infrared receiving tube 20 is corresponding relation with reception, can be blocked according to described
Infrared signal obtains touching the position of breach；Then, need judgement to be single-point or multiple point touching, that is, judge described touch breach
Whether it is single, if so, as single-touch, now need not carry out the step screening pseudo- point below, you can judge that this single touches
Touching breach is true touch point, and is calculated the coordinate value of this true touch point；If it is not, as multiple point touching, need into one
Step judges the position of true touch point.
Step S14：Described infrared touch panel 100 is chosen and comprises the described rectangular area 40 and just touching breach 30
Rectangular cells 50, described rectangular area 40 and square shaped cells 50 are constituted by the plurality of vertical curve is intersecting, described square
The length of side of unit 50 is the spacing between adjacent two infrared transmitting tubes or infrared receiving tube；
When implementing, the touch breach 30 obtaining in described step S13 is entirely not true touch point, and it may
Include fict pseudo- point it is therefore desirable to screen out pseudo- point further, just can find true touch point.The present invention is to pass through
Set multiple rectangular areas 40 and square shaped cells 50, described rectangular area 40 and square shaped cells 50 are by the plurality of vertical
Line intersects composition, and this rectangular area 40 can comprise described touch breach 30 just, or than the described scope touching breach 30
Slightly larger, you can described touch breach 30 is included into and is contracted to certain sweep limits.
Step S15：It is scanned in described rectangular area 40 for basic scanning element with described square shaped cells 50, sentence
Whether break the plurality of vertical curve, the first oblique line or the second oblique line by the arbitrary sub- triangle screening area in square shaped cells 50
60, described sub- triangle screening area 60, with 50 4 summits of square shaped cells as right-angled apices, if so, then carries out step S16；If
No, then carry out step S17；
Refer to Fig. 4, when implementing, described square shaped cells 50 are the base carrying out screening out pseudo- point in rectangular area 40
This scanning element, described square shaped cells 50 specifically include four with its four summits as right-angled apices triangle sieves respectively
Constituency 60, in the present embodiment, the area of described sub- triangle screening area 60 is the 1/8 of described square shaped cells 50 area.Due to
Four summits of four square shaped cells 50 are crosspoint, by judging the plurality of vertical curve, the first left-leaning oblique line or the right side
The second oblique line inclining whether by the sub- triangle screening area 60 of square shaped cells 50, that is, has vertical curve, the first oblique line or second
Oblique line non-quilt triangle screening area 60 is blocked, thus realizing screening out the pseudo- point of this square shaped cells 50.
Step S16：Judge the friendship that the vertical curve in described square shaped cells 50, the first oblique line and the second oblique line are crossed to form
Crunode is pseudo- point；
In described infrared touch panel, multiple vertical curves, the first oblique line and the second oblique line form multiple crosspoints, as long as described
In the interior four sub- triangle screening areas 60 of square shaped cells 50, any one has vertical curve, the first oblique line or the second oblique line to pass through,
I.e. it is believed that the crosspoint in described square shaped cells 50 is pseudo- point, you can exclude.
Step S17：Judge the friendship that the vertical curve in described square shaped cells 50, the first oblique line and the second oblique line are crossed to form
Crunode is possible touch point；
Repeat step S15, to step S17, obtains all of possible touch point in rectangular area 40；
Refer to Fig. 5, so scanned one by one in multiple rectangular areas 40 by square shaped cells 50, preliminary screening falls institute
State the pseudo- point existing in rectangular area, obtain all of possible touch point.
When the area of true touch point is less, for example, carried out during touch with nib screening out in addition it is also necessary to carry out secondary pseudo- point.
Therefore described obtain also including after the step of be possible to touch point in described rectangular area：
Judge the plurality of vertical curve, the first oblique line or the second oblique line whether by square in described rectangular area 40
All of sub- triangle screening area 60 in unit 50, described sub- triangle screening area 60 is straight with 50 4 summits of square shaped cells
Angular vertex, if so, then judges the intersection that the vertical curve in described square shaped cells 50, the first oblique line and the second oblique line are crossed to form
Point is pseudo- point；If it is not, then judging the friendship that the vertical curve in described square shaped cells 50, the first oblique line and the second oblique line are crossed to form
Crunode is possible touch point；Repeat the above steps, obtain all of possible touch point in rectangular area 40.
Step S18：Remove pseudo- point present in this possibility touch point by checking described possible touch point, be calculated true
The coordinate value of real touch point.
Refer to Fig. 6, when implementing, by whether judging the plurality of vertical curve, the first oblique line or the second oblique line
By described possible touch point, if so, i.e. on this possibility touch point, the vertical curve of all directions, the first oblique line or the second oblique line are equal
Blocked by described possible touch point, then described possible touch point is true touch point；If it is not, then described possible touch point is puppet
Point, because screening out.
Refer to Fig. 5 and Fig. 6, in order to improve pseudo- point discrimination further and reduce workload, will obtain described in can
In energy touch point, adjoining two or several points merge, reorientate, and obtain the merging touch point of low amount, then enter
Row pseudo- point identification.
I.e. described step S19 also includes：
Neighbouring point in the described possible touch point obtaining is connected into line segment or rectangle, judges described line segment or rectangle
Central point is to merge touch point, removes pseudo- point present in this merging touch point by described merging touch point, is calculated true
The coordinate value of real touch point.
, this five possible touch points A, B, C, D, E are interconnected to one taking certain five possible touch points A, B, C, D, E as a example
Rectangle, then the central point E judging this rectangle, as merging touch point, only needs whether inspection center point F is pseudo- point, and need not be one by one
Whether inspection may touch point A, B, C, D, E be pseudo- point.
Separately, refer to Fig. 7, the invention provides a kind of infrared touch panel alignment system, including an infrared touch panel 100,
Relatively located at multiple infrared transmitting tubes 10 of described 100 liang of frames of infrared touch panel and multiple infrared receiving tube 20, located at described
Main control module 300 in infrared touch panel 100 and the data processing centre 400 being connected to described main control module 300；Each is red
Emission pipe 10 corresponds to three infrared receiving tubes 20, and each infrared receiving tube 20 corresponds to three infrared transmitting tubes 10；Described many
It is formed with multiple vertical curves, the first left-leaning oblique line and Right deviation between individual infrared transmitting tube 10 and corresponding infrared receiving tube 20
Second oblique line；
Described main control module 300 is used for starting the plurality of infrared transmitting tube 10 and multiple infrared receiving tube 20；
Described data processing centre 400 further includes：
Touch breach judgment sub-unit 402, judge for the receipt signal by detecting the plurality of infrared receiving tube 20
The position of breach is touched on described infrared touch panel 100；
Scanning patter chooses subelement 404, comprises the described square touching breach for choosing on described infrared touch panel
Shape region and square shaped cells, described rectangular area and square shaped cells are constituted by the plurality of vertical curve is intersecting, described
The length of side of square shaped cells is the spacing between adjacent two infrared transmitting tubes 10 or infrared receiving tube 20；
Possible touch point computation subunit 406, for described square shaped cells for basic scanning element in described rectangle
It is scanned in region, judge the plurality of vertical curve, the first oblique line or the second oblique line whether by described square shaped cells
Arbitrary sub- triangle screening area, described sub- triangle screening area with four summits of this square shaped cells as right-angled apices, if so,
Then judge crosspoint that the vertical curve in described square shaped cells, the first oblique line and the second oblique line be crossed to form as pseudo- point；If it is not,
Then judge that the crosspoint that the vertical curve in described square shaped cells, the first oblique line and the second oblique line are crossed to form touches as possible
Point；
True touch point computation subunit 408, for being removed in this possibility touch point by checking described possible touch point
The pseudo- point existing, is calculated the coordinate value of true touch point.
Wherein, the area of described sub- triangle screening area is the 1/8 of described square shaped cells area.
Described data processing centre 400 also includes：
Merge touch point computation subunit 407, for neighbouring point in the described possible touch point obtaining is connected into line
Section or rectangle, judge the central point of described line segment or rectangle as merging touch point；Described true touch point computation subunit 408 is also
For pseudo- point present in this merging touch point is removed by described merging touch point, it is calculated the coordinate of true touch point
Value.
Compared to prior art, multi-touch of infrared touch screen recognition methods of the present invention and system are by adopting rectangular area
And square shaped cells are scanned screening out puppet point that may be present, and is tested in all of possible touch point, shorten
Infrared transmitting tube and the sweep time of infrared receiving tube, improve infrared touch screen response speed and positioning precision, thus improving
The accuracy of multi-touch of infrared touch screen identification.
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 of embodiments disclosed herein and change are possible, real for those skilled in the art
It is known for applying the replacement of example and equivalent various parts.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 assemblies,
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
The other deformation of row and change.
Claims (8)
1. a kind of multi-touch of infrared touch screen recognition methods is it is characterised in that the method comprising the steps of：There is provided one red
Outer touch-screen, relative multiple infrared transmitting tubes located at described infrared touch panel two frame and multiple infrared receiving tube are described many
Individual infrared transmitting tube and multiple infrared receiving tube are all placed equidistant, and each infrared transmitting tube corresponds to three infrared receiving tubes, often
One infrared receiving tube corresponds to three infrared transmitting tubes, is formed between the plurality of infrared transmitting tube and corresponding infrared receiving tube
There is the second oblique line of multiple vertical curves, the first left-leaning oblique line and Right deviation；Start the plurality of infrared transmitting tube and multiple infrared
Reception pipe is scanned, and judges to touch on described infrared touch panel by detecting the multiple infrared receiving tube receipt signals being blocked
Touch the position of breach；When judging that described touch breach is multiple situations, described infrared touch panel is chosen described in comprising
Touch rectangular area and the square shaped cells of breach, described rectangular area and square shaped cells are by the plurality of vertical curve phase
Hand over and constitute, the length of side of described square shaped cells is the spacing between adjacent two infrared transmitting tubes or infrared receiving tube；With described just
Rectangular cells are scanned in described rectangular area for basic scanning element, judge the plurality of vertical curve, the first oblique line or
Whether, by the arbitrary sub- triangle screening area in described square shaped cells, described sub- triangle screening area is with this just for second oblique line
Four summits of rectangular cells are right-angled apices, if so, then judge vertical curve in described square shaped cells, the first oblique line and second
The crosspoint that oblique line is crossed to form is pseudo- point；If it is not, then judging the vertical curve in described square shaped cells, the first oblique line and second
The crosspoint that oblique line is crossed to form is possible touch point；Repeat above-mentioned screening decision process in described rectangular area, until
To all of possible touch point；Remove pseudo- point present in this possibility touch point by checking described possible touch point, calculate
Coordinate value to true touch point.
2. multi-touch of infrared touch screen recognition methods according to claim 1 it is characterised in that described by detect quilt
The multiple infrared receiving tube receipt signals stopping judge that the step touching the position of breach on described infrared touch panel is specifically wrapped
Include：The infrared signal that the plurality of infrared receiving tube according to being blocked receives obtains touching the position of breach, judges described touching
Touch whether breach is single, if so, then judge that this touch breach, as true touch point, is calculated the coordinate of this true touch point
Value.
3. multi-touch of infrared touch screen recognition methods according to claim 2 is it is characterised in that described sub- triangle sieves
The area in constituency is the 1/8 of described square shaped cells area.
4. multi-touch of infrared touch screen recognition methods according to claim 1 is it is characterised in that obtain described rectangle region
Also include after the step of be possible to touch point in domain：The plurality of vertical curve, first oblique is judged in described rectangular area
Whether, by all of sub- triangle screening area in square shaped cells, described sub- triangle screening area is with pros for line or the second oblique line
Four summits of shape unit are right-angled apices, if so, then judge that vertical curve in described square shaped cells, the first oblique line and second are oblique
The crosspoint that line is crossed to form is pseudo- point；If it is not, then judging that the vertical curve in described square shaped cells, the first oblique line and second are oblique
The crosspoint that line is crossed to form is possible touch point；Repeat the above steps, obtain all of possible touch point in rectangular area.
5. multi-touch of infrared touch screen recognition methods according to claim 1 it is characterised in that described by inspection institute
State and may remove pseudo- point present in this possibility touch point in touch point, the step being calculated the coordinate value of true touch point is also wrapped
Include：Neighbouring point in the described possible touch point obtaining is connected into line segment or rectangle, judges the center of described line segment or rectangle
Point, for merging touch point, removes pseudo- point present in this merging touch point by described merging touch point, is calculated and truly touches
Touch coordinate value a little.
6. a kind of multi-touch of infrared touch screen identifying system is it is characterised in that include：One infrared touch panel, relatively located at institute
State multiple infrared transmitting tubes and multiple infrared receiving tube, the master control in described infrared touch panel of infrared touch panel two frame
Module and the data processing centre being connected to described main control module；Each infrared transmitting tube corresponds to three infrared receiving tubes, often
One infrared receiving tube corresponds to three infrared transmitting tubes；Formed between the plurality of infrared transmitting tube and corresponding infrared receiving tube
There is the second oblique line of multiple vertical curves, the first left-leaning oblique line and Right deviation；Described main control module is used for starting the plurality of infrared
Transmitting tube and multiple infrared receiving tube；Described data processing centre further includes：Touch breach judgment sub-unit, be used for passing through
Detect that the receipt signal of the plurality of infrared receiving tube judges to touch the position of breach on described infrared touch panel；Scanning patter selects
Take subelement, comprise the described rectangular area touching breach and square shaped cells for choosing on described infrared touch panel,
Described rectangular area and square shaped cells are constituted by the plurality of vertical curve is intersecting, and the length of side of described square shaped cells is adjacent
Spacing between two infrared transmitting tubes or infrared receiving tube；Possible touch point computation subunit, for described square shaped cells
It is scanned in described rectangular area for basic scanning element, judge the plurality of vertical curve, the first oblique line or the second oblique line
Whether by the arbitrary sub- triangle screening area in described square shaped cells, described sub- triangle screening area is with this square shaped cells
Four summits are right-angled apices, if so, then judge that the vertical curve in described square shaped cells, the first oblique line and the second oblique line intersect
The crosspoint being formed is pseudo- point；If it is not, then judging that the vertical curve in described square shaped cells, the first oblique line and the second oblique line intersect
The crosspoint being formed is possible touch point；True touch point computation subunit, for being removed by checking described possible touch point
Present in this possibility touch point, pseudo- point, is calculated the coordinate value of true touch point.
7. multi-touch of infrared touch screen identifying system according to claim 6 is it is characterised in that described sub- triangle sieves
The area in constituency is the 1/8 of described square shaped cells area.
8. multi-touch of infrared touch screen identifying system according to claim 6 is it is characterised in that described Data processing
The heart also includes：Merge touch point computation subunit, for neighbouring point in the described possible touch point obtaining is connected into line segment
Or rectangle, judge the central point of described line segment or rectangle as merging touch point；Described true touch point computation subunit is additionally operable to
Pseudo- point present in this merging touch point is removed by described merging touch point, is calculated the coordinate value of true touch point.
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| CN106445254B (en) * | 2016-09-05 | 2019-07-26 | 青岛海信电器股份有限公司 | Touch screen scanning method and device |
| CN108008864B (en) * | 2017-11-28 | 2020-11-10 | 暨南大学 | Touch positioning method and device for infrared touch screen |
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| CN101930322A (en) * | 2010-03-26 | 2010-12-29 | 陈伟山 | Identification method capable of simultaneously identifying a plurality of contacts of touch screen |
| CN102364415A (en) * | 2011-06-28 | 2012-02-29 | 广东威创视讯科技股份有限公司 | Infrared touch screen multi-touch-point recognition method and device |
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| CN102479000A (en) * | 2010-11-26 | 2012-05-30 | 北京汇冠新技术股份有限公司 | Infrared touch screen and multi-point identification method thereof |
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| CN101930322A (en) * | 2010-03-26 | 2010-12-29 | 陈伟山 | Identification method capable of simultaneously identifying a plurality of contacts of touch screen |
| CN102364415A (en) * | 2011-06-28 | 2012-02-29 | 广东威创视讯科技股份有限公司 | Infrared touch screen multi-touch-point recognition method and device |
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