CN103019461A - Multi-point positioning method for infrared matrix touch screen - Google Patents
Multi-point positioning method for infrared matrix touch screen Download PDFInfo
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- CN103019461A CN103019461A CN2011103006398A CN201110300639A CN103019461A CN 103019461 A CN103019461 A CN 103019461A CN 2011103006398 A CN2011103006398 A CN 2011103006398A CN 201110300639 A CN201110300639 A CN 201110300639A CN 103019461 A CN103019461 A CN 103019461A
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Abstract
The invention relates to a multi-point positioning method for an infrared matrix touch screen. The multi-point positioning method comprises the following steps of: S1, predetermining the number of axes to be scanned and corresponding angles; S2, scanning the axes of different angles in sequence, and generating logic data reflecting axis touch information after processing; S3, combining data intervals obtained in scanning of the X axis and the Y axis to obtain possible touch points; S4, calculating the intersection of the scanning area corresponding to the data interval in a single inclined scanning direction and one touch area generated by S3, and updating the long axis and the short axis in the touch area if the intersection exists; S5, repeating Step S4, calculating intersections of scanning areas corresponding to data intervals in other inclined axial directions and the touch point updated in Step S4, wherein the point does not exist when the intersections of the scanning areas corresponding to all the data intervals in one direction and the touch point updated in Step S4 is 0; otherwise, the point may be a real point; and S6, repeating Step S4 and S5, and calculating other possible touch areas in Step S3.
Description
Technical field
The present invention relates to the method that a kind of infrared matrix touch-screen detects a plurality of touch points, particularly the method for the calculating of position, a plurality of touch point and size.
Background technology
At present, touch-screen has vast potential for future development as a kind of input equipment of hommization.Along with the develop rapidly of computing machine touch-screen industry, wherein infrared touch panel is simple with its production technology, and production cost is low, and is easy for installation, non-maintaining, and high anti-knock properties, the advantages such as high reliability are also extensively applied to every field gradually.The basic structure of infrared touch panel is to install in a certain order some to infrared emission and infrared receiver component a display surface edge that is fit to install.These transmit and receive element according to mode one to one form emission receive right, edge along display surface consists of a mutually perpendicular emission receiving array, under the control of microcomputer system, connect respectively in a certain order every a pair of element that transmits and receives, detect every pair of infrared ray that transmits and receives between the element and whether hindered
Disconnected, determined whether that with this touch event occurs.Detailed principle has description in US Patent No. 5162783 and domestic many patents.
Existing Infrared touch screen systems, its Infrared consists of lattice structure at display surface, detects when touching, and just can calculate the position coordinates that touch event occurs by touching the grid node position that occurs.This touch detecting pattern so that existing infrared touch panel within the given period, detection system receives only unique one group of position data.Therefore when only having a touch point, touch-screen can work,
When operating simultaneously for 2 or above touch point, system is with the position coordinates of miscount, and the touch location that causes reporting is not actual touch location.
For above-mentioned reasons, existing infrared touch panel technology need to use the occasion of multiple point touching to lose efficacy at some.There have been at present some solutions for example suitable by the priority that detects the touch event generation
Order is identified a plurality of touch points in conjunction with tracing algorithm, but for mobile simultaneously touch point, and a plurality of point is quick, has in the situations such as movement of intersection, and false recognition rate is very high, and practical function is poor.
In view of present infrared screen system above shortcomings, the present invention proposes a kind ofly can simply and accurately calculate the position of a plurality of touch operation and the algorithm of size.
Summary of the invention
The object of the present invention is to provide a kind ofly for Infrared touch screen systems, can identify the algorithm of two or more touch operation.
For solving the problems of the technologies described above, the invention discloses a kind of infrared matrix touch-screen multipoint positioning method and mainly comprise the steps:
S1, the number of axle that pre-determines scanning and corresponding angle, initiating hardware;
S2, within a scan period, carry out successively the axle scanning of different angles, each axle scan-data is through removing surround lighting, the data such as normalization are processed, and generate the logical data of this axle touch information of expression, its expression-form for example: [reference position 1, final position 1, reference position 2, final position 2 ...] or the form of other equivalently represented these logical messages.Wherein, [reference position, final position] is called a data interval;
S3, according to X, the data interval that Y d-axis scanning obtains makes up, and obtains existing the zone of touch point;
The corresponding parallelogram scanning area of data interval and the 3rd on S4, the single oblique direction of scanning of calculating goes on foot the common factor of certain touch area that produces, and upgrades the major and minor axis of this touch area if common factor exists.
S5, repeating step S4, calculate the common factor of the new region of certain touch area among scanning area corresponding to other oblique axial data intervals and the step S4, if the common factor of the new region of certain touch area is 0 in the scanning area that all data intervals are corresponding on certain direction and the step 4, that just represents that this point does not exist, otherwise this point may be true point;
S6, repeating step S4, S5, the touch area of other hypothesis among the calculation procedure S3.
The touch area of S7, all hypothesis is all calculated complete, can obtain position and the size of touch point according to this touch area.By the touch system interface, the information of each touch point of drawing is delivered in the computer system, return again step 1, begin new scanning.
Among the above-mentioned steps S4, in some touch point of corner areas, the scanning area that does not exist some inclined shaft to form namely can't obtain the data interval that some inclined shaft forms.For Unified Algorithm, we give tacit consent to the non-existent inclined shaft scanning of all corner areas formation when calculating data interval all exists.Carry out again the calculating of size and location a little.
The present invention does not need to change the hardware configuration of existing infrared touch panel, can finish the detection of a plurality of touch points, can determine more accurately size and the position of touch point, for the touch point on the corner good recognition effect is arranged also.
Description of drawings
Fig. 1 is for determining the synoptic diagram in initial touch zone.
Fig. 2 is the synoptic diagram that occurs simultaneously and calculate in the corresponding parallelogram of the data interval zone of actual touch zone and inclined shaft scanning.
Fig. 3 is the synoptic diagram that occurs simultaneously and calculate in the corresponding parallelogram of the data interval zone of non-actual touch zone and inclined shaft scanning.
Fig. 4 is the synoptic diagram that increases the corner areas data interval a direction of scanning.
Fig. 5 is the synoptic diagram after all direction of scanning increase the corner areas data interval.
Fig. 6 is the entire flow figure that the present invention identifies a plurality of touch points.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
At first consult Fig. 1 and cooperate shown in Figure 6ly, 101 is radiating circuit plates that infrared emission component is installed among Fig. 1, the 102nd, the circuit board for receiving of infrared receiver component is installed.The logical data example of touch information during the scanning of 111,112,113,114th, X d-axis.The logical data example of touch information during the scanning of 121,122,123,124th, Y d-axis.The position of the starting point of 111 expression X-axis touches wherein, the position of the terminating point of 112 these touches of expression; 113 is the position of the starting point of another touch of X-axis, and 114 is the position of the terminating point of this touch.The position of the starting point of a touch of 121 expression Y-axis, the position of the terminating point of 122 these touches of expression; 123 is the position of the starting point of another touch of Y-axis, and 124 is the position of the terminating point of this touch.
X, Y d-axis scan-data interval is expressed as respectively (111,112,113,114), (121,122,123,124) can obtain four possible touch areas by combination: A (111,112,121,122), B (111,112,123,124), C (113,114,121,122), D (113,114,123,124)
Suppose the touch area for oval, take the B zone as example, 112-111 and 124-123 are respectively the major and minor axis of oval touch area B so.As shown in Figure 1, A, B, C, D are zone, four touch points, suppose that wherein B and C point is true point.
Fig. 2 is actual touch zone and the regional synoptic diagram that occurs simultaneously and calculate of the corresponding parallelogram of data interval that the inclined shaft direction of scanning obtains.A, B, C, D are zone, four touch points, suppose that wherein B and C point is true point.
201 is radiating circuit plates that infrared emission component is installed among Fig. 2, the 202nd, the circuit board for receiving of infrared receiver component is installed.The logical data example of touch information during the scanning of 211,212nd, X d-axis.The logical data example of touch information during the scanning of 221,222nd, Y d-axis.Wherein 211 expression touch point C are in the position of X-axis starting point, and 212 expression touch point C are in the position of X-axis terminating point.221 expression touch point C are in the position of the starting point of Y d-axis, and 222 expression touch point C are in the position of the terminating point of Y d-axis.The 251st, the angle of inclined shaft scanning.231,232nd, Infrared was blocked the oblique sweep trace of zone boundary when the shaft angle degree was the scanning of 251 inclined shaft; 233,234th, the oblique sweep trace of another zone boundary that Infrared was blocked when angle was the scanning of 251 inclined shaft.
241,242nd, the axis in a C zone.The x value of its center line 241 is 211 and 212 mean value, and 242 y value is 221 and 222 mean value.261,262,263,264th, the intersection point of axis 241,242 and oblique sweep trace 231,232.
The reference axis angle is that the parallelogram zone that is blocked of the inclined shaft scanned infrared light of 251 oblique direction of scanning is as follows with the Intersection set method in C zone (211,212,221,222):
Calculate first the common factor in 231 and 232 folded parallelogram zones and C zone (211,212,221,222).The axis 241,242 of calculation level C prime area and the coordinate of the intersection point 261,262,263,264 of oblique sweep trace 231,232.The X interval (261.x, 262.x) that wherein 261,262 x coordinate figure composition is new, and should compare with the X interval (211,212) of original C in the interval, two interval common factors calculated; The Y interval (263.y, 264.y) that 263,364 y coordinate composition is new, and should compare with the Y interval (221,222) of original C in the interval, two interval common factors calculated.If two common factors that calculate all are not empty, the new X that then will obtain, the common factor in Y interval forms a new regional C1.
Calculate again the common factor in 233 and 234 folded parallelogram zones and C zone (211,212,221,222).By finding out among Fig. 2, do not occur simultaneously in two zones, and the result of calculating also is empty set.
After two parallelogram zones that the inclined shaft scanned infrared light of this oblique direction of scanning is blocked are all calculated and are finished, as can be known, there is common factor in the C zone with the parallelogram zone that the party makes progress, thereby the intersection area C 1 that obtains is assigned to C as its new region, the inclined shaft scanning of calculating again this new zone and other direction forms the common factor in zone, after calculating is finished until occur simultaneously in all oblique direction of scanning, just obtain accurate location and the size of C touch point.
Fig. 3 is non-actual touch zone and the regional synoptic diagram that occurs simultaneously and calculate of the corresponding parallelogram of data interval that the inclined shaft direction of scanning obtains.A, B, C, D are zone, four touch points, suppose that wherein B and C point is true point.
301 is radiating circuit plates that infrared emission component is installed among the figure, the 302nd, the circuit board for receiving of infrared receiver component is installed.The logical data example of touch information during the scanning of 311,312nd, X d-axis.The logical data example of touch information during the scanning of 321,322nd, Y d-axis.Wherein 311 expression touch point A are in the position of X-axis starting point, and 312 expression touch point A are in the position of X-axis terminating point.321 expression touch point A are in the position of the starting point of Y d-axis, and 322 expression touch point A are in the position of the terminating point of Y d-axis.The 351st, the angle of inclined shaft scanning.331,332nd, Infrared was blocked the oblique sweep trace of zone boundary when angle was the scanning of 351 inclined shaft; 333,334th, the oblique sweep trace of another zone boundary that Infrared was blocked when angle was the scanning of 351 inclined shaft.
341,342, be the axis of an a-quadrant.The x value of its center line 341 is 311 and 312 mean value, and 342 y value is 321 and 322 mean value.361,362,363,364th, the intersection point of axis 341,342 and oblique sweep trace 331,232.
The reference axis angle is that the parallelogram zone that is blocked of the inclined shaft scanned infrared light of 351 oblique direction of scanning is as follows with the Intersection set method of a-quadrant (311,312,321,322):
Calculate first the common factor of 331 and 332 folded parallelogram zones and a-quadrant (311,312,321,322).By finding out among Fig. 3, do not occur simultaneously in two zones, and the result of calculating also is empty.
With the common factor of same method the calculating 333 and 334 folded parallelogram zones of calculating the true common factor of putting with a-quadrant (311,312,321,322).The axis 341,342 of calculation level A prime area and the coordinate of the intersection point 361,362,363,364 of oblique sweep trace 333,334.Wherein 361,362 x coordinate figure forms new X interval (361.x, 362.x), and should the interval with the X interval (311,312) of original A relatively, calculates two interval common factors, the common factor that obtains here is very little to be (311,362.x); 363,364 y coordinate forms new Y interval (363.y, 364.y), and should compare with the Y interval (321,322) of original A in the interval, calculate two interval common factors, if 364.y between 321 and 322, then occurs simultaneously for (364.y, 322) otherwise occurs simultaneously for empty.If the common factor on the Y-direction is empty, then do not occur simultaneously with a-quadrant (311,312,321,322) in 333 and 334 folded parallelogram zones yet.If this moment, the common factor on the Y-direction be empty, X so, the common factor composition on the Y-direction new region A1, also very little.
After two parallelogram zones that the inclined shaft scanned infrared light of this oblique direction of scanning is blocked are all calculated and are finished, 333 and 334 folded parallelogram zones and a-quadrant (311,312,321,322) common factor also is empty, then put the a-quadrant with this direction of scanning on the parallelogram zone all do not have to occur simultaneously, can judge that A is non-existent touch point.If its common factor exists for A1, then A1 is assigned to A as its new region, the inclined shaft scanning of calculating again this new zone and other direction forms the common factor in zone.Because touch point A is non-existent point, the common factor A1 that calculates than original regional little a lot, this zone again with a plurality of directions on the inclined shaft zone seek common ground after, final common factor also can become sky.If be not empty at last, zone owing to non-existent point after calculating through occuring simultaneously can reduce greatly so, thereby can judge according to the region area size at last, select the larger several touch points of area as output, thereby get rid of non-existent point with higher probability.
Fig. 4 is the synoptic diagram that increases the corner areas data interval a direction of scanning.A, B, C, D are zone, four touch points, suppose that wherein B and C point is true point.401 is radiating circuit plates that infrared emission component is installed among Fig. 4, the 402nd, the circuit board for receiving of infrared receiver component is installed.421 is the shaft angle degree of oblique direction of scanning.411,412,413,414 for the shaft angle degree that increase be the logical information data of end points of the corner data interval of 421 oblique direction of scanning.Wherein 411 is the position of the starting point of first corner data interval, and 412 is the position of the terminating point of this first corner data interval; 413 is the position of the starting point of another corner data interval, and 414 is the position of the terminating point of this corner data interval.432,433 for the shaft angle degree be the border of 421 overlay area, oblique direction of scanning.431,434 is the virtual oblique scanning coverage area boundaries identical with the direction of scanning.Length between 411 and 412, the length between 413 and 414 can obtain by the height of screen and the angle calculation of direction of scanning.The covering corner angle that 431 and 432 folded parallelogram zone, 433 and 434 folded parallelogram zones are increase is 421 oblique scanning area.Increase touch point, the corner B among the figure behind this zone just with this direction of scanning on 431 and 432 folded parallelogram zones common factor is arranged.In like manner, such acquiescence corner data interval to be set also in the other direction, think during calculating that such data interval always exists.The touch point not impact of these data intervals on being positioned at the center.
All oblique direction of scanning all increase after the above-mentioned default data interval, just can calculate with the computing method identical with the touch point, central area the touch point of corner areas.
Fig. 5 is the synoptic diagram behind the corner areas data interval that increases on all direction of scanning.A, B, C, D are zone, four touch points, suppose that wherein B and C point is true point.501 is radiating circuit plates that infrared emission component is installed among Fig. 5, the 502nd, the circuit board for receiving of infrared receiver component is installed.511,512,513,514th, the axle data interval of the corner that replenishes on the direction of scanning that takes on the X-axis.521,522,523,524th, the axle data interval of the corner that replenishes on the direction of scanning that takes on the X-axis.531,532,533,534th, the data interval of the corner that axle replenishes on the direction of scanning on the lower side on the Y-axis.541,542,543,544th, the data interval of the corner that axle replenishes on the direction of scanning on the upper side on the Y-axis.After increasing these intervals, whole touch screen zone all has been covered to, and just the computing method with the touch point, central area are identical with the computing method of position for the size of corner areas touch point.
Claims (2)
1. one kind infrared matrix touch-screen multipoint positioning method is characterized in that may further comprise the steps:
S1. pre-determine the number of axle and the corresponding angle of scanning, initiating hardware;
S2. within a scan period, carry out successively the axle scanning of different angles, generate after treatment the logical data of this axle touch information of expression;
S3. according to X, the data interval that the scanning of Y d-axis obtains makes up, and obtains the touch area that may exist;
S4. calculate the common factor of certain touch area that produces among the corresponding scanning area of data interval on the single oblique direction of scanning and the step S3, exist then upgrade the major and minor axis of this touch area if occur simultaneously;
S5. repeating step S4, calculate the common factor of the touch area of upgrading among scanning area corresponding to other oblique axial data intervals and the step S4, if the common factor of the touch area of upgrading among the scanning area that all data intervals are corresponding on certain direction and the step S4 is 0, that just represents that this point does not exist, otherwise this point may be true point;
S5. repeating step S4, S5, other touch areas that may exist among the calculation procedure S3;
The touch area that S6. might exist is all calculated complete, can obtain position and the size of touch point according to this touch area, by the touch system interface, the information of each touch point of drawing is delivered in the computer system, return again step S1, begin new scanning.
2. the method for claim 1 is characterized in that the data interval of giving tacit consent to the non-existent inclined shaft scanning of all corner areas formation when the calculating of described step S4 all exists.
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| CN106095180A (en) * | 2016-06-15 | 2016-11-09 | 湖州佳格电子科技股份有限公司 | A kind of touch screen scanning method |
| CN107506094A (en) * | 2014-05-30 | 2017-12-22 | 湖州佳格电子科技股份有限公司 | A kind of touch-screen touch area localization method |
| CN104423730B (en) * | 2013-09-11 | 2018-02-13 | 柯尼卡美能达株式会社 | Panel input device and image processing apparatus |
| CN110489015A (en) * | 2019-08-19 | 2019-11-22 | 青岛海信商用显示股份有限公司 | Touch point determines method and device, touch screen and display |
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| CN110489015A (en) * | 2019-08-19 | 2019-11-22 | 青岛海信商用显示股份有限公司 | Touch point determines method and device, touch screen and display |
| CN110489015B (en) * | 2019-08-19 | 2023-08-08 | 青岛海信商用显示股份有限公司 | Touch point determining method and device, touch screen and display |
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Application publication date: 20130403 |