CN103970360A - Multipoint-touch-based gesture identification method and system - Google Patents
Multipoint-touch-based gesture identification method and system Download PDFInfo
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Abstract
The invention relates to a multipoint-touch-based gesture identification method and a multipoint-touch-based gesture identification system. The method is applied to an infrared touch screen with infrared transmission and receiving geminate transistor arrays which are arranged along the periphery of an effective touch area. According to the method, when a plurality of touch points exist in the effective touch area, pseudo touch points are not required to be removed, and quasi touch points are divided into different point sets according to the distances between the quasi touch points; if only one point set is formed, single-hand operation is determined, and the geometric center of the point set is determined as the center output of the touch points; if more than one point set is formed, a true point set is found, and the geometric center of the true point set is determined as the center output of the touch points. The touch points on the effective touch area of the infrared touch screen can be identified under the condition of not adding scanning lines only by the gesture identification method, and the hardware of the infrared touch screen is not required to be changed; the method the system have the advantages of small computation amount, high execution efficiency and low research and development cost.
Description
Technical field
The present invention relates to a kind of gesture identification method and system based on multiple point touching, belong to microprocessor control technology field, be particularly useful for the detection technique field, touch point of infrared touch panel.
Background technology
Infrared touch panel of the prior art as shown in Figure 1, is provided with infrared transmitting tube 1 and infrared receiving tube 2 one to one on the frame of effective Petting Area border surrounding.Processor at a time only has an infrared transmitting tube 1 to launch Infrared (being called below sweep trace) by sequential control circuit control, thereby carves at this moment corresponding receiving tube 2 and can only receive a sweep trace in direction.Within a scan period, each infrared transmitting tube 1 of processor control successively transmit scan line scans effective Petting Area; If effectively have touch point to exist in Petting Area, stop portions sweep trace is understood in touch point, can determine the positional information of touch point according to the positional information of the corresponding infrared transmitting tube 1 of the sweep trace being blocked and infrared reception 2 pipes.
If effectively only have a touch point (single-point touches) in Petting Area, the sweep trace blocking according to touch point directly judges the positional information of touch point, and under touch-screen, the operating system of display system judges that according to the positional information of touch point and movement locus touch is operating as click or drag operation again.
If effectively have two touch points (2 touches) in Petting Area, Fig. 2 has provided the situation that has two touch points in effective Petting Area.As can be seen from the figure, in the time having two touch points in effective Petting Area, iff scanning by man-to-man scan mode, can obtain four accurate touch points, comprise actual touch point 3, and pseudo-touch point 4.Now to accurately obtain the positional information of actual touch point, also need to remove the operation of pseudo-touch point.In prior art, the method of removing pseudo-touch point has following several: (1) is scanned by one group of parallel scan lines with the first angle of inclination (can select main shaft scanning), obtain the position of accurate touch point, then adopt the parallel scan lines with the second angle of inclination to scan, get rid of pseudo-touch point; (2) adopt the parallel scan lines at the first angle of inclination and the parallel scan lines at the second angle of inclination to scan simultaneously, directly get rid of pseudo-touch point; (3) adopt the scan mode of one-to-many to scan, the first initial line circle and first that obtains each touch point taking infrared transmitting tube one end as benchmark stops border, the the second initial border and second that obtains each touch point taking infrared receiving tube one end as benchmark stops border, the intersection point on the first initial line circle and the second initial border is as the initial border of reality, first stops the intersection point on border and the second termination border, stop border as reality, obtain thus the boundary information of actual touch point.Above three kinds of modes, are documented in detail in the patent application document CN 201210514711.1 before applicant, do not do too much explanation at this.Removing after pseudo-touch point, under touch-screen the operating system of display system again according to the positional information of touch point and movement locus judge touch be operating as amplification, dwindle, the operation such as rotation.
In infrared touch panel, comparatively ripe to the recognition technology of single-point touches and 2 touches, but along with the continuing to increase of touch-screen size, the range of application of touch-screen is also more and more wider.For example, existing vehicle supervision department adopts large-sized touch-screen to show electronic chart, traffic information etc.; And for example, in the command centre of some vital tasks, also can adopt large-sized touch-screen to carry out monitor task practice condition.Under this applicable cases, single-point touches or 2 touches that are applied as one hand or both hands that touch is inapplicable, more.For example, can adopt five fingers of a hand to be placed on touch-screen, drag to realize by five fingers the operation pulling; Also two hands all can be placed on touch-screen, the finger of every hand is pulled outwardly respectively, realizes enlarging function.In order to realize the function of above-mentioned simple gesture identification, in prior art, pass through the complicated scanning process of design, respectively touch point corresponding each finger is identified, and to follow the tracks of judgement after the movement locus of each touch point be one-handed performance or many manual manipulations, and it is the operation of amplifying, dwindling or rotating.Obviously, if follow the tracks of the movement locus of five touch points or ten touch points, in infrared touch panel, will certainly make scan mode very complicated, and to the processing of scan-data difficulty especially, to a certain extent, must affect the response speed of infrared touch panel.
Summary of the invention
Technical matters to be solved by this invention is in prior art, to identify singlehanded touch or both hands touch and adopt complicated scan mode and data processing affect the response speed of infrared touch panel, thereby a kind of simple gesture identification method based on multiple point touching and system that the touch of every hand is approximately to single-point touches is provided.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions: a kind of gesture identification method based on multiple point touching, comprises the steps:
S1: effective Petting Area is carried out to horizontal and vertical scanning, determine the positional information of accurate touch point according to the scan line position being blocked;
S2: the number of regions being blocked according to transversal scanning and longitudinal scanning judges touch point number carries out single-point touches operation in the time that touch point number is one, then returns to described step S1; In the time that touch point number is two, carry out at 2 and touch operation, then return to described step S1; Otherwise be multiple point touching, directly enter step S3;
S3: divide point set according to the positional information of each accurate touch point in real time, and obtain point set number j according to the point set of dividing;
S4: according to point set number j, export the centre coordinate of the touch point of true point set.
The step that judges touch point number in described step S2 is as follows:
Obtain the number of regions f that number of regions e that transversal scanning is blocked and longitudinal scanning are blocked:
If Max(e, f)=1, be single-point touches;
If Max(e, f)=2, be 2 touches;
If Max(e, f) >2 is multiple point touching.
In described step S3, divide the step of point set according to the positional information of each accurate touch point as follows:
According to the positional information of each accurate touch point, obtain the distance d between any two accurate touch points in real time
m, and and setting threshold D comparison: by the distance d between any two accurate touch points
mthe accurate touch point that is all less than described setting threshold D is divided into a point set, obtains point set number j.
In described step S4, the step of centre coordinate of exporting the touch point of true point set according to point set number j is as follows:
If j=1, this point set is true point set, the centre coordinate output using the geometric center of this point set as touch point; If j > 1, filters out and a little concentrates the true point set that comprises true touch point, the centre coordinate output using the geometric center of each described true point set as touch point.
The method of screening true point set in described step S4 comprises the steps:
S41: by the scan mode of one-to-many, effective Petting Area is carried out to transversal scanning, taking infrared transmitting tube one end as benchmark, horizontal the first initial line circle that the Article 1 sweep trace being blocked by true touch point is true touch point, horizontal the first termination border that the last item sweep trace is true touch point;
Taking infrared receiving tube one end as benchmark, horizontal the second initial border that the Article 1 sweep trace being blocked by true touch point is true touch point, horizontal the second termination border that the last item sweep trace is true touch point;
The horizontal initial border that the horizontal ordinate of horizontal the first initial line circle of true touch point and the intersection point on horizontal the second initial border is true touch point; The horizontal first termination border of true touch point and the horizontal termination border that the horizontal second horizontal ordinate that stops the intersection point on border is true touch point;
S42: repeat in the vertical said process, obtain longitudinal initial border and the longitudinal termination border of true touch point;
S43: according to the horizontal initial border of true touch point and horizontal border and longitudinal initial border and the longitudinal termination border of stopping, determine the positional information of this true touch point;
S44: determine that according to the positional information of true touch point the point set at its place is true point set.
In described step S4, screen the method for true point set, comprise the steps:
S4A: on horizontal/longitudinal, described effective Petting Area is carried out to one-to-many scanning;
S4B: taking infrared transmitting tube one end as benchmark, the Article 1 sweep trace being blocked is laterally/the 3rd longitudinal initial border, the last item sweep trace is laterally/the 3rd longitudinal termination border;
Taking infrared receiving tube one end as benchmark, the Article 1 sweep trace being blocked is laterally/fourth longitudinal initial line circle, the last item sweep trace is laterally/the 4th longitudinal termination border;
Described laterally/longitudinal the 3rd initial border with described laterally/longitudinally the intersection point of fourth initial line circle be laterally/longitudinal the 3rd frontier point, the described border that laterally/the longitudinal the 3rd stops is horizontal/longitudinal the 4th frontier point with the intersection point on described horizontal/longitudinal the 4th termination border;
S4C: be positioned at described laterally/longitudinal the 3rd frontier point with described horizontal/point set in longitudinal the 4th frontier point line direction is true point set.
Described setting threshold D is set to 20cm.
The present invention also provides a kind of gesture recognition system based on multiple point touching, comprising:
For effective Petting Area is carried out to horizontal and vertical scanning, and determine the device of the positional information of accurate touch point according to the scan line position being blocked;
Judge touch point number for the number of regions being blocked according to transversal scanning and longitudinal scanning, and according to the device of touch point number decision operation mode;
Be used for dividing point set according to the positional information of each accurate touch point, and obtain the device of point set number j according to the point set of dividing;
For according to point set number j, export the device of the centre coordinate of the touch point of true point set.
Describedly judge touch point number for the number of regions being blocked according to transversal scanning and longitudinal scanning, and according to the device of touch point number decision operation mode, further comprise:
Obtain the device of the number of regions f that number of regions e that transversal scanning is blocked and longitudinal scanning be blocked;
Judge Max(e, f) be whether 1 device, if 1 is single-point touches;
Judge Max(e, f) be whether 2 device, if 2 is 2 touches;
Judge Max(e, f) whether be greater than 2 device, if be greater than 2 for multiple point touching.
Describedly divide point set for the positional information according to each accurate touch point, and also further comprise according to the device that the point set of dividing obtains point set number j:
For the device of setting threshold D size;
For in real time according to the positional information of each accurate touch point, obtain the distance d between any two accurate touch points
m, and and setting threshold D comparison: the distance d between any two accurate touch points
mthe accurate touch point that is all less than described setting threshold D is divided into the device of a point set;
Obtain the device of point set number j.
Be used for according to point set number j, the device of exporting the centre coordinate of the touch point of true point set further comprises:
For in the time that point set number is one, the device of the centre coordinate output using the geometric center of this point set as touch point;
For in the time that point set number is greater than one, filters out and a little concentrate the true point set that comprises true touch point, the device of the centre coordinate output using the geometric center of each described true point set as touch point.
Described in the time that point set number is greater than one, filter out and a little concentrate the true point set that comprises true touch point, the device of the centre coordinate output using the geometric center of each described true point set as touch point further comprises:
For by the scan mode of one-to-many, effective Petting Area being carried out after transversal scanning, obtain horizontal initial border and the horizontal device that stops border of real touch point;
For the scan mode by one-to-many, effective Petting Area is carried out obtaining after longitudinal scanning the device on longitudinal initial border and the longitudinal termination border of true touch point;
For according to the horizontal initial border of true touch point and horizontal border and longitudinal initial border and the longitudinal termination border of stopping, determine after the positional information of true touch point, the true point set that comprises true touch point is concentrated to the device filtering out from putting.
Described in the time that point set number is greater than one, filter out and a little concentrate the true point set that comprises true touch point, the device of the centre coordinate output using the geometric center of each described true point set as touch point further comprises:
For by the scan mode of one-to-many, effective Petting Area being carried out after laterally/longitudinal scanning, obtain the device of the position of laterally/longitudinal the 3rd frontier point and the position of laterally/longitudinal the 4th frontier point;
For by be positioned at described laterally/longitudinal the 3rd frontier point with described horizontal/device that point set in longitudinal the 4th frontier point line direction screens.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) gesture identification method and the system based on multiple point touching of the present invention, can, in the situation that not increasing sweep trace, only just can identify the multiple touch points on effective Petting Area of infrared touch panel by gesture identification method of the present invention.First the present invention divides point set to the multiple touch points on effective Petting Area of infrared touch panel, and each point set not only comprises true touch point but also comprise pseudo-touch point, does not need to remove the operation of pseudo-touch point completely; And judge that according to point set number multiple touch points belong to one hand or both hands.In the time that point set number is 1, for one hand touches, point set can be regarded as to single-point touches operation, the centre coordinate using the geometric center of point set as touch point is as the positional information output of touch point; In the time that point set number is not 1, for both hands touch, remove pseudo-touch after point set, regard two remaining true point sets as two point operation, the centre coordinate using the geometric center of true point set as touch point is as the positional information output of touch point.Under touch-screen, the operating system of display system judges to touch as which kind of operation according to the positional information of touch point again.The present invention need not change the hardware of infrared touch panel, also need not increase sweep trace, only need one hand to touch to be approximately single-point touches or both hands touch is approximately to 2 touches can realize simple gesture identification method, just can identify the operation of the multiple touch points on effective Petting Area of infrared touch panel, there is calculated amount little, the advantage that execution efficiency is high, R&D costs are low.
(2) gesture identification method and the system based on multiple point touching of the present invention, can accurately determine the positional information of each true touch point by the scanning of one-to-many, thereby obtain true point set position accurately, there is the hardware that does not need to increase infrared touch panel, only just can remove the pseudo-advantage that touches point set by existing scan mode.
(3) gesture identification method and the system based on multiple point touching of the present invention, in the time removing pseudo-touch point set, scan mode by one-to-many laterally or is longitudinally scanning effective Petting Area, respectively taking infrared transmitting tube as benchmark with taking infrared receiving tube as benchmark, determine forward and reverse outermost four edges boundary line, this four edges boundary line must be corresponding true touch point, and this four edges boundary line has two intersection points, the direction that connects the line segment of these two intersection points necessarily represents the line direction of true point set, thereby obtain the positional information of true point set accurately.Therefore do not need to determine the positional information of each true touch point, and only need to carry out the scanning that a direction carries out one-to-many and determine the initial frontier point of institute's pointed set and stop frontier point, there is the hardware that does not need to increase infrared touch panel, only just can remove the pseudo-advantage that touches point set by existing scan mode.
Brief description of the drawings
For content of the present invention is more likely to be clearly understood, below in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein,
Fig. 1 is the structural representation of infrared touch panel of the present invention;
Fig. 2 is the schematic diagram of 2 touches in effective Petting Area of the present invention;
Fig. 3 is the schematic diagram of multiple point touching in effective Petting Area of the present invention;
When being multiple point touching of the present invention, Fig. 4 is divided into the schematic diagram of multiple point sets;
Fig. 5 is the enlarged diagram of the portion of I shown in Fig. 4;
Fig. 6 is that point is concentrated while having three true touch points, definite method of geometric center;
Fig. 7 is the schematic diagram that the scan mode by one-to-many of the present invention is determined the horizontal boundary of true touch point;
Fig. 8 is the schematic diagram that definite point of the present invention is concentrated true touch point horizontal boundary;
Fig. 9 is the horizontal initial frontier point of point set of the present invention and the schematic diagram that laterally stops frontier point line before;
In figure, Reference numeral is expressed as: 1-infrared transmitting tube, 2-infrared receiving tube, 3-true touch point, 31-the first true touch point, 32-the second true touch point, the pseudo-touch point of 4-, the true point set of 5-, the pseudo-point set of 6-, the geometric center of the true point set of 7-.
Embodiment
As the content of saying in background technology, in the time having He Liangge touch point, a touch point in effective Petting Area, can obtain according to method of the prior art positional information and the movement locus of touch point.What the present invention mainly solved is when adopting singlehanded touch or when both hands touch, and effectively the touch point in Petting Area is more than the situation of two.Therefore following embodiment of the present invention is all that to be applied in touch point in effective Petting Area be when more than three and three.
embodiment 1
The present embodiment provides a kind of gesture identification method based on multiple point touching, comprises the steps:
S1: gating infrared transmitting tube 1 and corresponding infrared receiving tube 2 one by one, effective Petting Area is carried out to horizontal and vertical scanning, determine the positional information of accurate touch point according to the scan line position being blocked; In this step, can select scan mode the most one to one, i.e. infrared transmitting tube 1 transmit scan line, control corresponding with it infrared receiving tube 2 received scanlines, adopt man-to-man scan mode to scan, there is multiple touch point in effective Petting Area time, there will be pseudo-touch point, as shown in Figure 3, wherein black round dot represents true touch point 3, and white round dot represents pseudo-touch point 4; The touch point positional information now obtaining comprises actual touch dot position information and pseudo-touch point positional information, and the touch point that is as the criterion is referred to as in true touch point and pseudo-touch point;
S2: the number of regions being blocked according to transversal scanning and longitudinal scanning judges touch point number, the method for wherein obtaining the number of touch point is, obtains the number of regions f that number of regions e that transversal scanning is blocked and longitudinal scanning are blocked:
If Max(e, f)=1, touch point number is 1, is single-point touches, returns to described step S1;
If Max(e, f)=2, touch point number is 2, is 2 touches, returns to described step S1;
If Max(e, f) >2, touch point number is greater than at 2 o'clock, is multiple point touching, directly enters step S3.
S3: divide point set according to the positional information of each accurate touch point in real time, and obtain point set number j according to the point set of dividing, its concrete steps are as follows: in real time according to the positional information of each accurate touch point, obtain the distance d between any two accurate touch points
m, and and setting threshold D comparison: by the distance d between any two accurate touch points
mthe accurate touch point that is all less than described setting threshold D is divided into a point set; Wherein, the distance d between any two accurate touch points
m, can represent according to the distance between the centre coordinate of two accurate touch points; Described setting threshold D sets according to the size of effective Petting Area, in order to improve its accuracy, what described setting threshold D was set is larger, generally, ultimate range between five fingers of a hand is in about 10cm, thinks to be a hand for fear of the touch point that two hand fingers are touched by mistake, can select described setting threshold D at 20cm-30cm, more preferably, can select described setting threshold D is 20cm.
S4: according to point set number j, export the centre coordinate of the touch point of true point set; Its concrete steps are as follows: according to described step S3, accurate touch point is divided into after point set, obtain point set number j: if j=1 is singlehanded touch, the operation that one hand is touched is approximately the touch of single-point, the now output of the centre coordinate using the geometric center of point set as touch point, as shown in Figure 5.If j>1, while being judged to be both hands touch, as shown in Figure 4, the corresponding point set of both hands is true point set 5, but similar with 2 touches, in the time there is two true point sets, also has pseudo-point set 6 and produces.Therefore in this step, filter out and a little concentrate the true point set 5 that comprises true touch point, the centre coordinate output using the geometric center of each described true point set 57 as touch point.
The point providing is in the present embodiment concentrated, there are two true touch points, four accurate touch points, scan by main shaft after the scan mode scanning of (infrared transmitting tube and infrared receiving tube that gating primary optical axis overlaps one by one scan), four accurate touch points that this point is concentrated can form a rectangle; Fig. 6 has provided when a true point and has concentrated the situation while having three true touch points, if adopt main shaft scan mode to scan effective Petting Area, may produce nine accurate touch points, but nine accurate touch points still can form a rectangle.As the embodiment that can select, also may select from the mode of axle scanning (infrared transmitting tube and infrared receiving tube that gating primary optical axis does not overlap one by one scan), effective Petting Area to be scanned, the accurate touch point obtaining after scanning can form a parallelogram, can select cornerwise intersection point of this parallelogram as geometric center.
Corresponding with said method, the present embodiment also provides a kind of gesture recognition system based on multiple point touching, comprising: for effective Petting Area is carried out to horizontal and vertical scanning, and determine the device of the positional information of accurate touch point according to the scan line position being blocked;
Judge touch point number for the number of regions being blocked according to transversal scanning and longitudinal scanning, and according to the device of touch point number decision operation mode; It further comprises: the device that obtains the number of regions f that number of regions e that transversal scanning is blocked and longitudinal scanning be blocked; Judge Max(e, f) be whether 1 device, if 1 is single-point touches; Judge Max(e, f) be whether 2 device, if 2 is 2 touches; Judge Max(e, f) whether be greater than 2 device, if be greater than 2 for multiple point touching;
For the device of setting threshold D size; Be used for dividing point set according to the positional information of each accurate touch point, and obtain the device of point set number j according to the point set of dividing; It further comprises for the positional information according to each accurate touch point in real time, obtain the distance dm between any two accurate touch points, and and setting threshold D comparison: the accurate touch point that the distance dm between any two accurate touch points is all less than described setting threshold D is divided into the device of a point set; With the device that obtains point set number j;
For according to point set number j, export the device of the centre coordinate of the touch point of true point set, it further comprises in the time that point set number is one, the device of the centre coordinate output using the geometric center of this point set as touch point; With in the time that point set number is greater than one, filter out a little and to concentrate the true point set that comprises true touch point, the device of the centre coordinate output using the geometric center of each described true point set 7 as touch point.
The gesture identification method based on multiple point touching that the present embodiment provides and system need not change the hardware of infrared touch panel, also need not increase sweep trace, only need one hand to touch to be approximately single-point touches or both hands touch is approximately to 2 touches can realize simple gesture identification method, just can identify the operation of the multiple touch points on effective Petting Area of infrared touch panel, there is calculated amount little, the advantage that execution efficiency is high.
embodiment 2
The present embodiment, as the preferred version of embodiment 1, screens the method for true point set in the step S4 in embodiment 1, can adopt following steps:
S41: by the scan mode (infrared light of an infrared transmitting tube transmitting can be received by multiple infrared receiving tubes) of one-to-many, effective Petting Area is carried out to transversal scanning, as shown in Figure 7, taking infrared transmitting tube one end as benchmark, the Article 1 sweep trace being blocked by true touch point is that No. 01 infrared transmitting tube is launched, the sweep trace of 01 ' number infrared receiving tube reception, it is horizontal the first initial line circle of true touch point, the last item sweep trace is No. 03 infrared transmitting tube transmitting, the sweep trace of 03 ' number infrared receiving tube reception, it is that horizontal first of true touch point stops border, taking infrared receiving tube one end as benchmark, the Article 1 sweep trace being blocked by true touch point is the sweep trace of 02 ' number infrared receiving tube reception, No. 02 infrared transmitting tube transmitting, it is the horizontal second initial border of true touch point, the last item sweep trace is the sweep trace of 04 ' number infrared receiving tube reception, No. 04 infrared transmitting tube transmitting, horizontal the second termination border that it is true touch point, the horizontal ordinate of the intersection point on true touch point horizontal the first initial line circle and horizontal the second initial border is the horizontal initial border of true touch point, the horizontal termination border that horizontal the first termination border of true touch point and the horizontal second horizontal ordinate that stops the intersection point on border are true touch point,
S42: repeat in the vertical said process, effective Petting Area is carried out longitudinal scanning and obtained longitudinal initial border and the longitudinal termination border of true touch point;
S43: according to the horizontal initial border of true touch point with laterally stop border, and longitudinal initial border and longitudinal termination border, can determine the positional information of this true touch point, as shown in Figure 8;
S44: the point set at true touch point place must be true point set, determines that according to the positional information of true touch point the point set at its place is true point set.As shown in Figure 8, when having determined behind the position of true touch point to described step S43 according to described step S41, for example the first true touch point 31 in figure and the second true touch point 32, can directly judge that the point set at described the first true touch point 31 places and the point set at described the second true touch point 32 places are true point set;
Corresponding with said method, described in the present embodiment in the time that point set number is greater than one, filter out and a little concentrate the true point set that comprises true touch point, the device of the centre coordinate output using the geometric center of each described true point set 7 as touch point further comprises:
For by the scan mode that adopts one-to-many, effective Petting Area being carried out after transversal scanning, obtain horizontal initial border and the horizontal device that stops border of real touch point;
For the scan mode by adopting one-to-many, effective Petting Area is carried out obtaining after longitudinal scanning the device on longitudinal initial border and the longitudinal termination border of true touch point;
For according to the horizontal initial border of true touch point and horizontal border and longitudinal initial border and the longitudinal termination border of stopping, determine after the positional information of true touch point, the true point set that comprises true touch point is concentrated to the device filtering out from putting.
embodiment 3
The present embodiment is as another preferred implementation of embodiment 1, described step S4, and the method for screening true point set, comprises the steps, taking laterally as example:
S4A: in the horizontal described effective Petting Area is carried out to one-to-many scanning;
S4B: as shown in Figure 9, taking infrared transmitting tube one end as benchmark, the Article 1 sweep trace being blocked is the 3rd horizontal initial border, the last item sweep trace is the 3rd horizontal termination border; Taking infrared receiving tube one end as benchmark, the Article 1 sweep trace being blocked is fourth horizontal initial line circle, and the last item sweep trace is the 4th horizontal termination border; Described horizontal the 3rd initial border and the described laterally intersection point of fourth initial line circle are horizontal the 3rd frontier point, and the described the horizontal the 3rd intersection point that stops border and described horizontal the 4th termination border is horizontal the 4th frontier point;
S4C: because described the 3rd frontier point and described the 4th frontier point must be blocked by true touch point definite, therefore two certain each corresponding true touch points in frontier point place, and the point set at true touch point place must be just true point set, the point set one being therefore positioned in described horizontal the 3rd frontier point and described horizontal the 4th frontier point line direction is decided to be true point set.
In like manner, in the vertical, also can adopt identical method to determine true point set.
Adopt the method in the present embodiment, do not need to determine the positional information of each true touch point, and only need to carry out the scanning that a direction carries out one-to-many and determine the initial frontier point of institute's pointed set and stop frontier point.
Corresponding with said method, described in the present embodiment in the time that point set number is greater than one, filter out and a little concentrate the true point set that comprises true touch point, the device of the centre coordinate output using the geometric center of each described true point set 7 as touch point further comprises:
For adopting the scan mode of one-to-many to carry out after laterally/longitudinal scanning effective Petting Area, obtain the device of the position of laterally/longitudinal the 3rd frontier point and the position of laterally/longitudinal the 4th frontier point;
For by be positioned at described laterally/longitudinal the 3rd frontier point with described horizontal/device that point set in longitudinal the 4th frontier point line direction screens.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being extended out thus or variation are still among the protection domain in the invention.
Claims (13)
1. the gesture identification method based on multiple point touching, is characterized in that, comprises the steps:
S1: effective Petting Area is carried out to horizontal and vertical scanning, determine the positional information of accurate touch point according to the scan line position being blocked;
S2: the number of regions being blocked according to transversal scanning and longitudinal scanning judges touch point number carries out single-point touches operation in the time that touch point number is one, then returns to described step S1; In the time that touch point number is two, carry out at 2 and touch operation, then return to described step S1; Otherwise be multiple point touching, directly enter step S3;
S3: divide point set according to the positional information of each accurate touch point in real time, and obtain point set number j according to the point set of dividing;
S4: according to point set number j, export the centre coordinate of the touch point of true point set.
2. the gesture identification method based on multiple point touching according to claim 1, is characterized in that, judges that the step of touch point number is as follows in described step S2:
Obtain the number of regions f that number of regions e that transversal scanning is blocked and longitudinal scanning are blocked:
If Max(e, f)=1, be single-point touches;
If Max(e, f)=2, be 2 touches;
If Max(e, f) >2 is multiple point touching.
3. the gesture identification method based on multiple point touching according to claim 1 and 2, is characterized in that, divides the step of point set as follows in described step S3 according to the positional information of each accurate touch point:
According to the positional information of each accurate touch point, obtain the distance d between any two accurate touch points in real time
m, and and setting threshold D comparison: by the distance d between any two accurate touch points
mthe accurate touch point that is all less than described setting threshold D is divided into a point set, obtains point set number j.
4. according to the arbitrary described gesture identification method based on multiple point touching of claim 1-3, it is characterized in that, in described step S4, the step of centre coordinate of exporting the touch point of true point set according to point set number j is as follows:
If j=1, this point set is true point set, the centre coordinate output using the geometric center of this point set as touch point; If j > 1, filters out and a little concentrates the true point set that comprises true touch point, the centre coordinate output using the geometric center of each described true point set as touch point.
5. the gesture identification method based on multiple point touching according to claim 4, is characterized in that:
The method of screening true point set in described step S4 comprises the steps:
S41: by the scan mode of one-to-many, effective Petting Area is carried out to transversal scanning, taking infrared transmitting tube one end as benchmark, horizontal the first initial line circle that the Article 1 sweep trace being blocked by true touch point is true touch point, horizontal the first termination border that the last item sweep trace is true touch point;
Taking infrared receiving tube one end as benchmark, horizontal the second initial border that the Article 1 sweep trace being blocked by true touch point is true touch point, horizontal the second termination border that the last item sweep trace is true touch point;
The horizontal initial border that the horizontal ordinate of horizontal the first initial line circle of true touch point and the intersection point on horizontal the second initial border is true touch point; The horizontal first termination border of true touch point and the horizontal termination border that the horizontal second horizontal ordinate that stops the intersection point on border is true touch point;
S42: repeat in the vertical said process, obtain longitudinal initial border and the longitudinal termination border of true touch point;
S43: according to the horizontal initial border of true touch point and horizontal border and longitudinal initial border and the longitudinal termination border of stopping, determine the positional information of this true touch point;
S44: determine that according to the positional information of true touch point the point set at its place is true point set.
6. the gesture identification method based on multiple point touching according to claim 4, is characterized in that:
In described step S4, screen the method for true point set, comprise the steps:
S4A: on horizontal/longitudinal, described effective Petting Area is carried out to one-to-many scanning;
S4B: taking infrared transmitting tube one end as benchmark, the Article 1 sweep trace being blocked is laterally/the 3rd longitudinal initial border, the last item sweep trace is laterally/the 3rd longitudinal termination border;
Taking infrared receiving tube one end as benchmark, the Article 1 sweep trace being blocked is laterally/fourth longitudinal initial line circle, the last item sweep trace is laterally/the 4th longitudinal termination border;
Described laterally/longitudinal the 3rd initial border with described laterally/longitudinally the intersection point of fourth initial line circle be laterally/longitudinal the 3rd frontier point, the described border that laterally/the longitudinal the 3rd stops is horizontal/longitudinal the 4th frontier point with the intersection point on described horizontal/longitudinal the 4th termination border;
S4C: be positioned at described laterally/longitudinal the 3rd frontier point with described horizontal/point set in longitudinal the 4th frontier point line direction is true point set.
7. according to the arbitrary described gesture identification method based on multiple point touching of claim 1-6, it is characterized in that:
Described setting threshold D is set to 20cm.
8. the gesture recognition system based on multiple point touching, is characterized in that, comprising:
For effective Petting Area is carried out to horizontal and vertical scanning, and determine the device of the positional information of accurate touch point according to the scan line position being blocked;
Judge touch point number for the number of regions being blocked according to transversal scanning and longitudinal scanning, and according to the device of touch point number decision operation mode;
Be used for dividing point set according to the positional information of each accurate touch point, and obtain the device of point set number j according to the point set of dividing;
For according to point set number j, export the device of the centre coordinate of the touch point of true point set.
9. the gesture recognition system based on multiple point touching according to claim 8, is characterized in that,
Describedly judge touch point number for the number of regions being blocked according to transversal scanning and longitudinal scanning, and according to the device of touch point number decision operation mode, further comprise:
Obtain the device of the number of regions f that number of regions e that transversal scanning is blocked and longitudinal scanning be blocked;
Judge Max(e, f) be whether 1 device, if 1 is single-point touches;
Judge Max(e, f) be whether 2 device, if 2 is 2 touches;
Judge Max(e, f) whether be greater than 2 device, if be greater than 2 for multiple point touching.
10. the gesture recognition system based on multiple point touching according to claim 8 or claim 9, is characterized in that, describedly divides point set for the positional information according to each accurate touch point, and also further comprises according to the device that the point set of dividing obtains point set number j:
For the device of setting threshold D size;
For in real time according to the positional information of each accurate touch point, obtain the distance d between any two accurate touch points
m, and and setting threshold D comparison: the distance d between any two accurate touch points
mthe accurate touch point that is all less than described setting threshold D is divided into the device of a point set;
Obtain the device of point set number j.
11. according to Claim 8-10 arbitrary described gesture recognition systems based on multiple point touching, is characterized in that, for according to point set number j, the device of exporting the centre coordinate of the touch point of true point set further comprises:
For in the time that point set number is one, the device of the centre coordinate output using the geometric center of this point set as touch point;
For in the time that point set number is greater than one, filters out and a little concentrate the true point set that comprises true touch point, the device of the centre coordinate output using the geometric center of each described true point set as touch point.
12. according to the claim gesture recognition system based on multiple point touching according to claim 11, it is characterized in that, described in the time that point set number is greater than one, filter out and a little concentrate the true point set that comprises true touch point, the device of the centre coordinate output using the geometric center of each described true point set as touch point further comprises:
For by the scan mode of one-to-many, effective Petting Area being carried out after transversal scanning, obtain horizontal initial border and the horizontal device that stops border of real touch point;
For the scan mode by one-to-many, effective Petting Area is carried out obtaining after longitudinal scanning the device on longitudinal initial border and the longitudinal termination border of true touch point;
For according to the horizontal initial border of true touch point and horizontal border and longitudinal initial border and the longitudinal termination border of stopping, determine after the positional information of true touch point, the true point set that comprises true touch point is concentrated to the device filtering out from putting.
13. gesture recognition systems based on multiple point touching according to claim 11, it is characterized in that, described in the time that point set number is greater than one, filter out and a little concentrate the true point set that comprises true touch point, the device of the centre coordinate output using the geometric center of each described true point set as touch point further comprises:
For by the scan mode of one-to-many, effective Petting Area being carried out after laterally/longitudinal scanning, obtain the device of the position of laterally/longitudinal the 3rd frontier point and the position of laterally/longitudinal the 4th frontier point;
For by be positioned at described laterally/longitudinal the 3rd frontier point with described horizontal/device that point set in longitudinal the 4th frontier point line direction screens.
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