CN105808019A - Method for detecting touch point coordinates of infrared touch screens - Google Patents
Method for detecting touch point coordinates of infrared touch screens Download PDFInfo
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- CN105808019A CN105808019A CN201410854155.1A CN201410854155A CN105808019A CN 105808019 A CN105808019 A CN 105808019A CN 201410854155 A CN201410854155 A CN 201410854155A CN 105808019 A CN105808019 A CN 105808019A
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Abstract
The invention discloses a method for detecting touch point coordinates of infrared touch screens. The method is characterized by comprising the following steps: carrying out infrared sector scanning; calculating quasi touch point coordinates by utilizing scanning lines; checking touch points; carrying out weighted averaging; transmitting real touch points. Through a sector scanning technology, various scanning lines (non-orthogonal scanning lines or orthogonal scanning lines) with a plurality of slopes can be obtained at one time, so that the infrared scanning times are decreased, the time is saved and the touch reaction speed is improved; the scanning lines for calculating the touch point coordinate values are close to orthogonal and the relevance between the data is relatively low, so that the positioning accuracy is improved; more importantly, coordinate values calculated by using scanning line groups from different directions are used during the calculation of the touch points, so that when the quantity of the coordinate values is enough, the weighted average result (namely, the touch point coordinates) can infinitely approach to the real touch points, and then the accuracy is relatively ensured.
Description
Technical field
The present invention relates to a kind of for the touch point coordinate detection method of infrared touch panel, related device, for performing the chip of the method and corresponding infrared touch panel.
Background technology
Infrared touch panel in the application is primarily referred to as infrared interactive multimedia all-in-one machine (the infrared large-size screen monitors of hereinafter referred) and infrared interactive electronic whiteboard (hereinafter referred infrared white board).Infrared coordinate detection (location, touch point) principle: existing infrared large-size screen monitors or electronic whiteboard are dependent on being arranged on the infrared frame of its screen surrounding and realize touch recognition.Infrared frame is integrated with transmitting tube, reception pipe, radiating circuit, reception circuit and the control IC for realizing controlling and signal being focused on to transmission circuit.When the user touches the screen, the Infrared that transmitting tube sends can not arrive receive pipe accordingly owing to being subject to the stop of touching object, thus causing loss of optical signal, by this " light line dropout " mechanism, it is achieved the location to touch point.Light that be blocked, disappearance is called scanning line；The pipe that receives lighting each transmitting tube and its correspondence successively carries out the process of data acquisition and is called infrared scan；The time completing single pass is called a scan period.The realization mechanism of infrared scan refers to United States Patent (USP) 5162783 (patentnumber) and Chinese patent 201210226494.6 (Figure 11), is incorporated by reference herein.
In existing infrared touch device, piping does not employ type or a pair many types of infrared frame one to one, generally all takes orthogonal scanning to carry out the location of touch point in conjunction with nonopiate scanning technique.The Chinese patent that application number is 200710100010 (documents 1) discloses the scanning of one type off-axis one to one, sees Figure 12.The program obtains the scanning line of inclination by off-axis scanning, dip sweeping line and orthogonal scanning line (vertically or horizontally) jointly determine the actual position of touch point.Patent 201110436294.9 (documents 2) discloses a kind of a pair many types of scan mode, see Figure 13, each effective receiving angle receiving pipe covers the multiple transmitting tubes on the frame of opposite, and " visual field " that each the some position on screen is all received pipe by exactly two covers.For a touch point, after having scanned, it is possible to obtain totally 4 groups of scannings line (each group includes multi-strip scanning line) in X-axis and Y-axis.
In documents 1, a coordinate measurement needs to carry out repeatedly infrared scan, and the scan period is likely to longer.Further, since touching object has certain volume and size, it is not necessary to be desirable point；Thus, touch each time and all can block one group of transmitting tube of continuous print, generate the some bunches of scanning lines from different visual angles；Therefore, in the sector scan scheme disclosed in documents 2, can be used for the quantity of information of coordinate setting and be doubled and redoubled.Since any two straight lines can uniquely calculate a coordinate figure, then, when choosing different straight line groups and being calculated, multiple different coordinate points certainly can be obtained.How to make full use of these data to become have to solve the technical problem that with the actual position reflecting touch point to greatest extent.
Summary of the invention
It is an object of the invention to the problems such as longer for the scan period in prior art, data volume is big, a kind of data processing scheme for improving infrared touch panel coordinate measurement precision is proposed, the program is by contact coordinate detection method, contact coordinate detecting device, corresponding control chip and infrared touch panel, it is possible to the above-mentioned technical problem of all or part of solution.
A first aspect of the present invention, it being in that to provide a kind of contact coordinate detection method for infrared interactive device, this contact coordinate detection method includes:
Perform infrared sector scan, obtain some and both included non-orthogonal, to be also possible to include orthogonal scanning line step；Scanning line combination of two is calculated the step of quasi-touch point coordinate；Use the scanning data alignment touch point that effective operating angle can cover the infrared receiving tube being verified coordinate points whether to cause and truly block the quasi-touch point testing sequence tested；And true touch point is exported to the touch point coordinate output step of main control computer or remaining processing sequences.
Alternatively, for calculate touch point coordinate scanning line both from the infrared receiving/transmission fluorescent tube on the same direction of infrared interactive device.
Alternatively, the two lines of any one touch point coordinate is calculated respectively from the infrared receiving/transmission fluorescent tube in the both direction of infrared interactive device.Further, in the testing sequence of above-mentioned touch point when inspection to a certain coordinate points really cause light block time, be denoted as true point；Otherwise reject this point.
Further, above-mentioned contact coordinate detection method also includes after the testing sequence of touch point the multiple coordinate figures to same touch point and seeks the step of weighted mean, that is: first determine whether whether multiple touch points coordinate belongs to same touch point, when each point belongs to same touch point, multiple coordinate figures are weighted mean value calculation and using result of weighted average as touch point coordinate.
Further, above-mentioned utilization close to orthogonal scanning line determine the step of touch point include one judge to participate in touch point coordinate calculates two scan lines whether close to orthogonal step: if close to orthogonal, carry out the calculating of touch point coordinate, otherwise do not carry out the calculating of touch point coordinate.
Further, when the scanning line for calculating touch point coordinate is both from the infrared receiving/transmission fluorescent tube on the same direction of infrared interactive device, a regional determination step was also included before calculating touch point coordinate, first whether this step be positioned at some region for two straight lines that point coordinates calculates and judge likely forming scanline groups, if located in a certain region, then carrying out combo calculating；Otherwise, this scanline groups is given up.
Contact coordinate method disclosed by the invention, disposable can be obtained the various scanning lines with multiple slopes, both include nonopiate scanning line by sector scan technology, it is also possible to include orthogonal scanning line, decrease the number of times of infrared scan, saved the time, improve sense of touch response speed；Touch point coordinate is calculated close to orthogonal scanning line (such as respectively from choosing the scanning line participating in touch point coordinate computation first direction and second direction and/or adopting slope ratio relatively or inner product calculates and carries out orthogonal level judgement) by adopting, reduce the relatedness between each group data for calculating touch point coordinate, decrease systematic error, improve operation efficiency, further increase positioning precision；More importantly, in the technical scheme including weighted mean operation step, owing to employing the scanline groups computed coordinate figure out from different azimuth when calculating touch point, when the quantity of coordinate figure is abundant, average weighted result (namely touch point coordinate) can the real touch point of infinite approach, relatively more guaranteed in precision.
A second aspect of the present inventionIt is in that to provide a kind of control chip, this chip includes one for receiving the Data Input Interface of infrared scan data and a processing unit for processing scan data, it is characterized in that, this control chip storage inside or burning have the program code or functional module that can perform method and steps in first aspect present invention.Further, this chip also includes several Installed System Memories, program code or functional module burning in Installed System Memory.
A third aspect of the present invention, it being in that to provide a kind of contact coordinate detecting device corresponding to method in first aspect present invention or step, it includes sector scan module, touch point coordinate calculation module, touch point inspection module and touch point output module, wherein:
Sector scan module is used for performing infrared sector scan, obtains some scanning lines, has both included nonopiate scanning line, it is also possible to include orthogonal scanning line in these scanning lines；Touch point coordinate calculation module, for the scanning line obtained is arranged in scanline groups between two, calculates the coordinate of quasi-touch point；
Touch point inspection module uses the scanning data of the infrared receiving tube of " effective operating angle can cover the coordinate points being verified " that this coordinate points " whether cause and truly block " is tested, when inspection to this point really cause light block time, be denoted as true point；Otherwise reject this point；Touch point output module is for exporting the true touch point obtained to main control computer or subsequent treatment module.Further, this contact coordinate detecting device also include one that be arranged between touch point inspection module and touch point output module, for judging whether multiple touch points coordinate belongs to same touch point and the multiple coordinate figures belonging to same touch point are weighted the weighted average calculation module of average computation.
A fourth aspect of the present inventionBeing in that to provide a kind of infrared touch panel, this touch screen includes touch panel and infrared frame, and touch panel is used for accepting touch signal input, infrared frame be used for detecting touch location and by output to main control computer or remaining processing sequences, infrared frame is arranged at least one opposite side of touch panel；Described infrared frame includes infrared transmitting tube, infrared receiving tube, transmitting-receiving control circuit and control unit, infrared transmitting tube and infrared receiving tube and is connected to transmitting-receiving control circuit, and transmitting-receiving control circuit is connected to control unit；Control unit is for being controlled the transmitting-receiving of Infrared and the signal collected is processed, it is characterized in that, sector scan module, touch point coordinate calculation module, touch point inspection module and touch point output module is included in described control unit, wherein:
Sector scan module is used for performing infrared sector scan, obtains some and had both included non-orthogonal, to be also possible to include orthogonal scanning line step；
Touch point coordinate calculation module, for the scanning line that scanning obtains is arranged in scanline groups between two, calculates the coordinate of quasi-touch point；Touch point inspection module uses the scanning data of the infrared receiving tube of " effective operating angle can cover the coordinate points being verified " that this coordinate points " whether cause and truly block " is tested, when inspection to this point really cause light block time, be denoted as true point；Otherwise reject this point；Touch point output module is for exporting the true touch point obtained to main control computer or subsequent treatment module.Further, described infrared touch panel also includes a weighted average module, this weighted average module is between touch point inspection module and touch point output module, for judging whether multiple touch points coordinate belongs to same touch point, and the multiple coordinate figures belonging to same touch point are weighted average computation.
Below in conjunction with Figure of description and specific embodiment, technical scheme is described in detail.
Figure of description
Fig. 1: coordinate measurement cyclic flow graph；
Fig. 2: sector scan flow chart；
Fig. 3: coordinate determines flow chart；
Fig. 4: Coordinates flow chart；
Fig. 5: the infrared frame schematic diagram of embodiment 1；
Fig. 6: the infrared frame schematic diagram of embodiment 2；
Fig. 7: open part or all of fluorescent tube schematic diagram figure；
Fig. 8: orthogonal decision flow chart；
Fig. 9: inner product calculation specifications figure；
Figure 10: region decision illustrates figure；
Figure 11: background technology 1 accompanying drawing；
Figure 12: background technology 2 accompanying drawing；
Figure 13: background technology 3 accompanying drawing.
Specific embodiment
The present invention relates to a kind of touch point coordinate detection method being applied to infrared touch panel and related device, the method is applicable to infrared large-size screen monitors and infrared electronic white board etc. and includes the interactive display device of infrared touch panel, seeing Figure 11, this infrared touch panel has the touch-sensitive area receiving touch input and the infrared transmitting tube, infrared receiving tube, countdown circuit, reception control circuit and the control unit that are installed at least one opposite side of touch-sensitive area.Countdown circuit is connected to transmitting tube and control unit, is used for driving infrared transmitting tube to launch Infrared；Receive control circuit and be connected to reception pipe and control unit, be used for driving infrared receiving tube receive Infrared and sample；Control unit is for coordinating control to the transmitting-receiving of Infrared and processing to determine position, touch point to the signal collected.All embodiments in this specification are respectively provided with the basic structure that this section is described, and repeat no more when introducing specific embodiment.
Separately, embodiment and the same step in the same different embodiment of mark digitized representation in accompanying drawing or module.It is preferable to carry out
Example 1
The present embodiment relates to a kind of single pair of frame infrared electronic white board, (in figure, black bars represents reception pipe as shown in Figure 5, each two black receives equidistant (6mm) between pipe and is provided with several infrared transmitting tube (not shown)s), this electronic whiteboard only includes infrared a pair frame, two infrared frames are arranged on a pair opposite side of electronic whiteboard touch area, and orientation aligns.
As shown in Figure 1a, the touch point coordinate measurement process that the present embodiment one is complete includes sector scan step 10, coordinate determines step 20, Coordinates step 30, weighted averaging step 40 and touch point output step 50:
Sector scan step 10 is used for performing infrared sector scan, obtain some both included non-orthogonal, be also possible to include orthogonal scanning line；
Coordinate determines that step 20 for calculating multiple quasi-touch points coordinate by scanning line combination of two；
To coordinate, Coordinates step 30 is for determining that the multiple point coordinates obtained in step carry out true and false judgement, to reject ghost point；
Weighted averaging step 40 is for being weighted average computation to obtain actual touch point coordinates to multiple coordinate figures of a touch point；
Output display step 50 is for exporting actual touch point coordinates to main control computer or subsequent treatment module.
Fig. 2 is the flow chart of sector scan step 10 in Fig. 1 a, interpreting blueprints 2 is it can be seen that sector scan step 10 in the present embodiment includes lighting successively the step 101 of each transmitting tube, opens effective operating angle can cover the step 102 receiving pipe of the infrared transmitting tube being currently just lit and record and analyzing and receive the photosignal that pipe receives and obtain the step 103 of scanning line while step 101.Wherein, for two touch points: the Infrared that in step 101, arbitrary transmitting tube (the only a few transmitting tube except edge) sends can be received pipe received (namely the quantity receiving pipe that can cover most of transmitting tube on the frame of opposite is all four) by the four of opposite；During scanning, light each transmitting tube 4 receptions pipes reception light (step 102) simultaneously opening on the frame of opposite successively；The signal of telecommunication received is judged by step 103, if the signal of telecommunication is less than the threshold values set in system, then it is assumed that this light touched point is blocked, obtains a scanning line；Each being blocked receives pipe can detect multi-strip scanning line, the present invention chooses the line midpoint of transmitting tube corresponding to multi-strip scanning line that a certain reception pipe detects and the line of this reception pipe, and as the scanning line participating in touch point coordinate and calculating (step 20), (in principle, an optional scanning line can realize the location of touch point, all adopts the line midpoint of the transmitting tube that multi-strip scanning line is corresponding and the line of this reception pipe as participating in the scanning line that in step 20, quasi-touch point coordinate calculates in this specification embodiment.Further, it is also possible to the coordinate figure scanning the multiple transmitting tubes being blocked that this scanning group obtains is carried out further computing (such as seeking weighted mean), to reflect the actual position of touch point as much as possible；Or, further, it is also possible to the waveform amplitude of variation of this scanning group is taken into account, the abscissa information of the transmitting tube being comprehensively blocked, improve the precision of location further)；L is there are based in this mechanism the present embodiment1-l8Article eight, scanning line (see Fig. 5).
Fig. 3 is the flow chart that in Fig. 1 a, coordinate determines step 20, interpreting blueprints 3 is it can be seen that the coordinate in the present embodiment determines that step 20 includes choosing successively the sub-step 201 of (first direction) each scanning line in X-axis and forms the scanning line step 202 to coordinates computed point with selected scanning line between two with other scanning lines in X-axis.With P (x in touch point in Fig. 5p, yp) and Q (xq, yq) for example, touch point P (xp, yp) altogether formation be denoted as l1-l44 scanning lines, touch point Q (xq, yq) altogether formation be denoted as l5-l84 scanning lines, calculate point coordinates time, 8 lines are arranged inIndividual scanline groups, can obtain altogether about 28 coordinate points (without intersection point, additionally intersection point is also possible to drop on outside screen parallel lines, without practical significance), subsequently into step 30.Herein, the coordinate points obtained in step 20 can also be called quasi-touch point, because it had both included real touch point, it is also possible to includes ghost point.Pseudo-touch point alleged in ghost point namely documents 1 (number of patent application is 200710100010).
As shown in Figure 4, step 30 is when checking coordinate points, first some T-R tubes that effective operating angle can be covered this coordinate points being verified are selected, then its infrared scan data " is checked ", judge whether this coordinate points calculated causes to block really, it is represent that this point is actual touch point, otherwise represents that this point is " ghost point ", it should reject.Due to the scanning line l from different azimuth in this example1-l4Can be arranged in altogetherIndividual scanning line pair, therefore, each touch point P (xp, yp) and Q (xq, yq) all can there be about 6 set coordinate figures, it is necessary to the many sets coordinate figure belonging to some touch point is further processed.
As shown in Figure 1a, weighted averaging step 40 is for being weighted average computation to obtain actual touch point coordinates P (x to multiple coordinate figures of same touch pointp, yp) and Q (xq, yq)；That is: first determine whether whether multiple touch points coordinate belongs to same touch point, when each point belongs to same touch point, then these multiple coordinate figures belonging to same touch point are weighted average computation and using this result of weighted average as final touch point coordinate.Owing to the point coordinates calculated is centered around around true touch point by each scanning line from different azimuth, therefore, the coordinate figure after weighted average can along with the center increasing unlimited approaching to reality touch point of scanning line pair, and degree of accuracy is more guaranteed.In view of the method belongs to conventional data processing method, the meaning when the method is used for infrared touch panel coordinate setting by this is simply introduced, and no longer its mechanism is done further discussion.Specifically, of weighted average calculation directly effective way is directly to average.
As shown in Figure 1a, the touch point output step 50 touch point coordinate P (x for obtainingp, yp) and Q (xq, yq) output is to the computer being connected on electronic whiteboard, and then by computer, this touch point displayed (such as generating track) or do further process (such as calling functional modules).If this method is used for infrared large-size screen monitors, then step 50 for being directly output to large-size screen monitors main frame or the computer being connected on large-size screen monitors by the touch point detected, then by large-size screen monitors main frame or be connected to the computer on large-size screen monitors touch operation is made corresponding process.Again or, if infrared electronic white board and infrared large-size screen monitors are provided with master control borad, and the functional module corresponding to step each in Fig. 1 a stores or burning is in master control borad, then output step 50 in touch point is for exporting actual touch point coordinates to the subsequent treatment module in master control borad.
More specifically, in step 20, formula one can be adopted to calculate the intersection point of any two lines (scanline groups), can also according to the concrete structure of touch area and infrared frame, derive other formula and calculate the intersection point of scanline groups, such as directly by two rectilinear(-al) equation group or employing Matrix Solving.
Formula one:
Formula one illustrates: (x y) has formation altogether and is denoted as l as it is shown in figure 5, touch point P1-l44 scanning lines, y0Representing the length of touch screen zone, some O represents the angle point (zero) in the lower left corner, touch area, x1、x3、x4And x7Represent four abscissas receiving pipe, x respectively2、x5、x6And x8Represent the abscissa of four transmitting tubes being blocked respectively.
Should be noted that, in other embodiment, if the scanning line calculating each touch point coordinate figure only has a pair, namely the touch point coordinate calculated in step 30 only has a set of, so line will thus be scanned to uniquely determining in this touch point, thus eliminating the many sets coordinate figure to belonging to same touch point to seek average weighted step 40.Or, although more than a pair of the scanline groups calculating each touch point coordinate figure (being 6 pairs in preferred embodiment 1), but only choose one pair of which when coordinates computed value to carry out, then this touch point also by by the scanning line being selected to uniquely determining, it is also possible to omit step 40.This situation is also applied for other embodiments in present specification.
Preferred embodiment 2
Fig. 6 is the infrared structure figure of the preferred embodiment of the present invention 2, the present embodiment have employed " four sides is hidden " infrared frame of type, the four edges of touch area is both provided with the infrared frame that orientation aligns, in figure, black bars represents infrared receiving tube, white square represents infrared transmitting tube (not shown in Fig. 6), between infrared receiving tube, equidistant (5mm) is provided with several infrared transmitting tubes, two effective " visuals field " receiving pipe that on screen, (sense of touch region) any point can be received by two in X-axis (first direction) in pipe and Y-axis (second direction) simultaneously cover.During coordinate measurement, line location can be scanned by four in any one touch point.
The method that realizes of the present embodiment is relatively similar with preferred embodiment 1, and difference is in that, its coordinate determines that step 20 includes: select successively
Take the sub-step 201' of (first direction) each scanning line in X-axis；And,
With the scanning line of (second direction) in the scanning line on selected first direction and Y-axis form between two scanning line to the step 202 of coordinates computed point '.
Touch point T1 and T2 in Fig. 6, sector scan can obtain altogether after completing being denoted as l1-l88 scanning lines, calculate point coordinates time, by 4 line l on first direction (X-axis)1、l2、l5、l6Successively with four scanning line l in second direction (Y-axis)3、l4、l7、l8It is arranged inIndividual scanline groups, can obtain altogether about 16 coordinate points, subsequently into step 30.
It should be noted that the scanline groups only become with the scanline groups in second direction with the scanning line on first direction in the present embodiment calculates possible touch point coordinate, such as l between the scanning line on same direction1、l2、l5、l6Between and l3、l4、l7、l8Between be not combined calculate.At this moment because calculate two straight lines intersection point time, two straight lines closer to orthogonal, the intersecting point coordinate obtained more accurate (because data between dependency relatively low).
The present embodiment step 20 can adopt any one the applying a formula in formula two calculate the intersection point of other any two lines (scanline groups), can also according to the concrete structure of touch area and infrared frame, derive other formula and calculate the intersection point of scanline groups, such as directly by two rectilinear(-al) equation group or employing Matrix Solving.
Formula two:
Formula two illustrates: in Fig. 6, (x y) forms l altogether to touch point T11-l4Article four, scanning line, x0, y0Representing the length and width of touch screen zone, some O represents the angle point (zero) in the lower left corner, touch area, (x2, 0), (x4, y0), (0, y2) and (x0, y4) represent four coordinates receiving pipe, (x respectively1, 0), (x3, y0), (0, y1) and (x0, y3) represent the coordinate of four transmitting tubes being blocked respectively.
In another embodiment, it is in that with the difference of preferred embodiment 2, coordinate determines that step 20 also includes an orthogonal judgement step, as shown in Figure 8, first this step judges likely forming the scanline groups orthogonality for two straight lines that point coordinates calculates, then the scanline groups of the orthogonality condition meeting default is matched, calculated, give up those scanline groups being unsatisfactory for orthogonality condition.Orthogonality judges that the method that specifically can adopt slope ratio relatively (difference of such as slope is more than a certain numerical value) or calculating inner product of vector as shown in Figure 9 carries out, and in Fig. 9, vector AC and BD represents a scanning line, AC=(d-b) i+y respectively0J, BD=(c-a) i+y0J, the dot product of vector AC and BD is:
If AC is ⊥ BD, then dot product is zero, it may be assumed that
Accordingly, line inner products can be scanned whether close to zero or carry out the judgements of two scanning line orthogonalities less than a certain threshold values according to two.Carry out the calculating of point coordinates only with inner product less than the scanline groups of a certain numerical value, give up those and connect subparallel line group.Connecing subparallel scanline groups in a large number owing to having given up, not only computational accuracy increases, and operand greatly reduces, and the performance of system is promoted.The method is applicable to all embodiments of the present invention.
In another embodiment of the present invention, it is in that with the difference of preferred embodiment 1, coordinate determines that step 20 also includes a regional determination step, first whether this step be positioned at some region for two straight lines that point coordinates calculates and judge likely forming scanline groups, if located in a certain region, then carrying out combo calculating；Otherwise, this scanline groups is given up.L is included with preferred embodiment 11Scanline groups be example, as it is possible that and l1Solve the scanning line obtaining actual touch point coordinate to be necessarily present in and l1Contiguous and its effective operating angle energy and l1Those overlapping receive in the scanning line that pipe is detected, therefore, and l1Have only to become scanline groups to carry out solving and can complete coordinate measurement with the scanline groups that detects of pipe that receives in broken box in Figure 10, and touch point missing inspection will not occur.Specifically, can carry out, with a certain bar rectilinear(-al) scanline groups, those that the reception pipe that effective operating angle that the scanning line of point coordinates derivation should be two end points place place " receive pipe " (the reception pipe at an end points place very, another possibility is that hypothesis) can cover detects and scan lines.When screen is relatively big and/or between each touch point distant time, technical scheme in the present embodiment can greatly reduce the number of times of coordinate derivation, the ghost of generation is counted and rejects the judgement number of times of ghost point, can reduce the response time to a certain extent, improve operation efficiency.It addition, in some other embodiment, coordinate determines that step can also include orthogonal determination step and regional determination step simultaneously.
It should be understood that
In embodiment 1, each touch point is covered (distribution is in the same direction) by the about four Zhi Jie shelters from different azimuth, in embodiment 2, each touch point is covered (two first directions, two second directions) by the four Zhi Jie shelters from different directions；Different transmitting-receiving fluorescent tubes can also be adopted in other examples to arrange, if the receiving pipe quantity and just can realize the detection of touch point more than 2 of any point position on cover screen in theory.
Above-described embodiment all have employed a pair many types of infrared frame, namely: the infrared frame of both sides, touch area is both provided with transmitting tube and receives pipe, the intensive setting of transmitting tube, receives and manages sparse setting, and each effective operating angle receiving pipe can cover multiple transmitting tubes on opposite；Can also adopting antipodal structure, receive and manage intensive setting, the sparse setting of transmitting tube, effective operating angle of each transmitting tube can cover the multiple of opposite and receive pipe.When method disclosed by the invention is applied to this structure, except being slightly different when performing infrared sector scan, other steps all can be identical.In this case sector scan step is: opens each the step 101' receiving pipe successively, open effective operating angle while step 101' and can cover the step 102' of the transmitting tube of the infrared receiving tube being currently opened and record and analysis receive the photosignal that pipe receives and obtain the step 103' of scanning line.It addition, method disclosed by the invention can also be applied in traditional infrared frame of type one to one, except being in this case slightly different except infrared sector scan, other steps all can be identical.As shown in Figure 7, in figure, black represents reception pipe, white represents transmitting tube, performs following steps during infrared scan: opens effective operating angle while opening the step 101 ", in step 101 " of each transmitting tube successively and can cover the step 102 " and record and analyzing receives the photosignal that pipe receives and obtains the step 103 of scanning line " receiving pipe of the infrared transmitting tube that has currently been opened.
Additionally, except above-mentioned scanning sequency or scanning logic, scanning sequency or the scanning logic that can also apply other complete infrared scan, as long as by scan can obtain reflection touch point actual position a plurality of both included non-orthogonal, be also possible to include orthogonal scanning line, all can realize the goal of the invention of the present invention.
Furthermore, the sector scan step 102 of each embodiment above-mentioned or 102' or 102 " in be all opening arbitrary transmitting tube or receive after pipe; open effective operating angle simultaneously and can cover this transmitting tube or receive all of pipe and receive pipe or transmitting tube; in some variants; can also only open reception pipe or transmitting tube that a part can effectively cover; as long as data volume is enough, the goal of the invention of the present invention can be realized.As shown in Figure 7, in 34 ° of angular ranges, the reception pipe of (effective operating angle) can both receive the Infrared that opposite apex transmitting tube sends, consider arithmetic speed and system burden, when data volume is enough to realize location, touch point, it is possible to only open and receive pipe (this situation is owing to calculating the scanning line of touch point coordinate closer to orthogonal and have higher degree of accuracy) between reception pipe or 17 ° of scopes and the 34 ° of scopes that opposite receives on frame within the scope of 17 °.
Additionally, the product of various infrared structure that coordinate detection method disclosed by the invention is widely portable in description to introduce and not yet introduce, the various deformation done when realizing principle without departing from the principle of the invention and/or infrared touch device or displacement, situation that such as infrared receiving/transmission fluorescent tube unequal-interval is arranged or the situation (such as annular infrared frame) of the situation of " one to one " type frame and " one-to-many " type frame mixed-arrangement and other irregular infrared frames.
Corresponding with above-mentioned various methods, step, invention also provides a kind of touch point coordinate detecting device being applied to infrared touch panel, this device includes sector scan module, touch point coordinate calculation module, touch point inspection module and touch point output module, wherein: sector scan module is used for performing infrared sector scan, obtain some scanning lines, these scanning lines both included nonopiate scanning line, it is also possible to include orthogonal scanning line；Touch point coordinate calculation module, for the scanning line obtained is arranged in scanline groups between two, calculates the coordinate of quasi-touch point；Touch point inspection module uses the scanning data of the infrared receiving tube of " effective operating angle can cover the coordinate points being verified " that this coordinate points " whether cause and truly block " is tested, when inspection to this point really cause light block time, be denoted as true point；Otherwise reject this point；Touch point output module is for exporting the true touch point obtained to main control computer.Further, this contact coordinate detecting device also include one that be arranged between touch point inspection module and touch point output module, for judging whether multiple touch points coordinate belongs to same touch point and the multiple coordinate figures belonging to same touch point are weighted the weighted average calculation module of average computation.
Above-mentioned various method, step are usually what the control unit shown in Fig. 1 b completed, and this control unit is connected to the transmitting of infrared touch panel and receives circuit, for the transmitting-receiving of Infrared is controlled and the data collected are processed.Specifically, this control unit can show as be integrated in infrared frame or as standalone module exist single-chip microcomputer or control mainboard, it has at least one and is connected to the data transmission interface and a data processing unit that receive circuit and radiating circuit, this control unit includes sector scan module, touch point coordinate calculation module, touch point inspection module and touch point output module, wherein: sector scan module is used for performing infrared sector scan, obtain some scanning lines, these scanning lines had both included nonopiate scanning line, it is also possible to include orthogonal scanning line；Touch point coordinate calculation module, for the scanning line obtained is arranged in scanline groups between two, calculates the coordinate of quasi-touch point；Touch point inspection module uses the scanning data of the infrared receiving tube of " effective operating angle can cover the coordinate points being verified " that this coordinate points " whether cause and truly block " is tested, when inspection to this point really cause light block time, be denoted as true point；Otherwise reject this point；Touch point output module is for exporting the true touch point obtained to main control computer.Further, this control unit also include one between touch point inspection module and touch point output module, for judging whether multiple touch points coordinate belongs to same touch point and the multiple coordinate figures belonging to same touch point are weighted the weighted average module of average computation.
Further, above-mentioned control unit also includes an Installed System Memory, and described sector scan module, touch point coordinate calculation module, touch point inspection module, weighted average module and the storage of touch point output module or burning are in this Installed System Memory.Closer, control unit also includes several other communication interfaces, above-mentioned sector scan module, touch point coordinate calculation module, touch point inspection module, weighted average module and touch point output module can also be stored in the computer-readable storage medium of all kinds, by the communication interface of control unit or be integrated in that control unit is internal to be called for control unit；Control unit is carried out data transmission by communication interface and external equipment.
Above in association with embodiment and accompanying drawing, technical scheme and innovative idea are elaborated; related personnel should be able to understand; embodiment disclosed in description and accompanying drawing belong to but do not limit protection scope of the present invention, any broadly fall into protection scope of the present invention without departing from innovative idea of the present invention and the displacement of initiative spirit, deformation, omission, change, deletion and replacement etc..It is really temporary be as the criterion with claims, rather than is limited only to the preferred embodiment in description.
Claims (24)
1. the contact coordinate detection method for infrared touch panel, it is characterised in that the method includes: perform infrared sector scan, obtains some and had both included non-orthogonal, to be also possible to include orthogonal scanning line step；Scanning line combination of two is calculated the step of quasi-touch point coordinate；Use the scanning data alignment touch point that effective operating angle can cover the infrared receiving tube being verified coordinate points whether to cause and truly block the quasi-touch point testing sequence tested；And by the touch point output step of true touch point output.
2. the contact coordinate detection method for infrared touch panel according to claim 1, it is characterised in that the described scanning line for calculating quasi-touch point coordinate is both from the infrared receiving/transmission fluorescent tube on the same direction of infrared touch panel.
3. the contact coordinate detection method for infrared touch panel according to claim 1, it is characterised in that calculate the two lines of any one quasi-touch point coordinate respectively from the infrared receiving/transmission fluorescent tube in the both direction of infrared touch panel.
4. the contact coordinate detection method for infrared touch panel according to claim 3, it is characterized in that, the described step utilizing scanning line computation quasi-touch point coordinate includes the step calculating touch point coordinate with each scanning line on first direction and the partly or entirely scanning line in second direction respectively.
5. according to any one of claim 1-4 for the contact coordinate detection method of infrared touch panel, it is characterised in that described infrared touch panel is type or a pair many types of infrared transceiver device one to one.
6. the contact coordinate detection method for infrared touch panel according to any one of claim 1-4, it is characterised in that the step of described infrared sector scan is:
Light each infrared transmitting tube sequentially in either order；While lighting each transmitting tube, open all or part of effectively operating angle and cover the reception pipe of this transmitting tube and gather data.
7. the contact detection method for infrared touch panel according to claim 5, it is characterised in that the step of described infrared sector scan is: light each infrared transmitting tube sequentially in either order；While lighting each transmitting tube, open all or part of effectively operating angle and cover the reception pipe of this transmitting tube and gather data.
8. according to any one of claim 1-4 for the contact coordinate detection method of infrared touch panel, it is characterised in that in the testing sequence of described quasi-touch point when inspection to the coordinate points being verified really cause light block time, be denoted as true point；Otherwise reject this point.
9. the contact coordinate detection method for infrared touch panel according to any one of claim 1-4, it is characterized in that, described contact coordinate detection method also includes a weighted averaging step being arranged at after the testing sequence of quasi-touch point, described weighted averaging step first determines whether whether multiple touch points coordinate belongs to same touch point, then the multiple coordinate figures belonging to same touch point is weighted average computation.
10. the contact coordinate detection method for infrared touch panel according to claim 9, it is characterized in that, described judge multiple touch points coordinate whether belong to the method for same touch point be check the plurality of touch point coordinate whether be positioned at same region or each other distance less than a certain threshold values.
11. the contact coordinate detection method for infrared touch panel according to claim 9, it is characterised in that the weighted average calculation that described multiple coordinate figures to belonging to same touch point are weighted in average computation refers to mean value calculation.
12. the contact coordinate detection method for infrared touch panel according to claim 8, it is characterized in that, described contact coordinate detection method also includes a weighted averaging step being arranged at after the testing sequence of quasi-touch point, described weighted averaging step first determines whether whether multiple touch points coordinate belongs to same touch point, then the multiple coordinate figures belonging to same touch point is weighted average computation.
13. the contact coordinate detection method for infrared touch panel according to claim 12, it is characterized in that, described judge multiple touch points coordinate whether belong to the method for same touch point be check the plurality of touch point coordinate whether be positioned at same region or each other distance less than a certain threshold values.
14. the contact coordinate detection method for infrared touch panel according to claim 12, it is characterised in that the weighted average calculation that described multiple coordinate figures to belonging to same touch point are weighted in average computation refers to mean value calculation.
15. according to any one of claim 1-4 for the contact coordinate detection method of infrared touch panel, it is characterised in that described scanning line is the line midpoint line with this reception pipe of the transmitting tube that multi-strip scanning line that a certain reception pipe detects is corresponding.
16. the contact coordinate detection method for infrared touch panel according to any one of claim 1-4, it is characterized in that, described utilize scanning line to determine the step of touch point coordinate also includes one " judge to participate in touch point coordinate calculates two scan lines whether close to orthogonal step ": if close to orthogonal, carry out the calculating of touch point coordinate, otherwise do not carry out the calculating of touch point coordinate.
17. the contact coordinate detection method for infrared touch panel according to claim 16, it is characterized in that, whether the described two scanning lines judging to participate in touch point coordinate calculating are in orthogonal step, it is judged that condition is that two scanline groups become the inner product of vector close to zero or to be not more than a certain threshold values.
18. the contact coordinate detection method for infrared touch panel according to any one of claim 1-4, it is characterized in that, a regional determination step is also included before calculating quasi-touch point coordinate, first whether this step be positioned at some region for two straight lines that point coordinates calculates and judge likely forming scanline groups, if located in a certain region, then carrying out combo calculating；Otherwise, coordinate points calculating is not carried out.
19. an infrared touch panel, including touch panel and infrared frame, touch panel is used for accepting touch signal input, infrared frame for detected touch point coordinate and by output to subsequent treatment module and/or main control computer, infrared frame is arranged at least one opposite side of touch panel；Described infrared frame includes infrared transmitting tube, infrared receiving tube, transmitting-receiving control circuit and control unit, infrared transmitting tube and infrared receiving tube and is connected to transmitting-receiving control circuit, and transmitting-receiving control circuit is connected to control unit；Control unit is for being controlled transmitting-receiving control circuit and the signal collected is processed, it is characterized in that, sector scan module, touch point coordinate calculation module, touch point inspection module and touch point output module is included in described control unit, wherein:
Sector scan module is used for performing infrared sector scan, obtains some scanning lines, has both included nonopiate scanning line, it is also possible to include orthogonal scanning line in these scanning lines；
Touch point coordinate calculation module, for the scanning line obtained is arranged in scanline groups between two, calculates the coordinate of quasi-touch point；Touch point inspection module uses the scanning data of the infrared receiving tube of " effective operating angle can cover the coordinate points being verified " that this coordinate points " whether cause and truly block " is tested, when inspection to this point really cause light block time, be denoted as true point；Otherwise reject this point；Touch point output module is for exporting obtained true touch point.
20. infrared touch panel according to claim 19, it is characterized in that, a weighted average module is also included in described control unit, this weighted average module is between touch point inspection module and touch point output module, for judging whether multiple touch points coordinate belongs to same touch point, and the multiple coordinate figures belonging to same touch point are weighted average computation.
21. the control unit for infrared touch panel, it is connected to reception circuit and the data transmission interface of radiating circuit, internal storage location and data processing unit including at least one, it is characterized in that, sector scan module, touch point coordinate calculation module, touch point inspection module and touch point output module is included in described internal storage location, wherein:
Sector scan module is used for performing infrared sector scan, obtains some scanning lines, has both included nonopiate scanning line, it is also possible to include orthogonal scanning line in these scanning lines；
Touch point coordinate calculation module, for the scanning line obtained is arranged in scanline groups between two, calculates the coordinate of quasi-touch point；Touch point inspection module uses the scanning data of the infrared receiving tube of " effective operating angle can cover the coordinate points being verified " that this coordinate points " whether cause and truly block " is tested, when inspection to this point really cause light block time, be denoted as true point；Otherwise reject this point；Touch point output module is for exporting obtained true touch point.
22. the control unit for infrared touch panel according to claim 21, it is characterized in that, also include in described internal storage location between touch point inspection module and touch point output module, for judging whether multiple touch points coordinate belongs to same touch point and the multiple coordinate figures belonging to same touch point are weighted the weighted average module of average computation.
23. for a contact coordinate detecting device for infrared touch panel, including sector scan module, touch point coordinate calculation module, touch point inspection module and touch point output module, wherein:
Sector scan module is used for performing infrared sector scan, obtains some scanning lines, has both included nonopiate scanning line, it is also possible to include orthogonal scanning line in these scanning lines；
Touch point coordinate calculation module, for the scanning line obtained is arranged in scanline groups between two, calculates the coordinate of quasi-touch point；Touch point inspection module uses the scanning data of the infrared receiving tube of " effective operating angle can cover the coordinate points being verified " that this coordinate points " whether cause and truly block " is tested, when inspection to this point really cause light block time, be denoted as true point；Otherwise reject this point；Touch point output module is for exporting obtained true touch point.
24. the contact coordinate detecting device for infrared touch panel according to claim 23, it is characterized in that, described contact coordinate detecting device also include one that be arranged between touch point inspection module and touch point output module, for judging whether multiple touch points coordinate belongs to same touch point and the multiple coordinate figures belonging to same touch point are weighted the weighted average calculation module of average computation.
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