CN105373267A - Multi-point identification method and device of infrared touch screen and infrared touch screen - Google Patents
Multi-point identification method and device of infrared touch screen and infrared touch screen Download PDFInfo
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- CN105373267A CN105373267A CN201510929996.9A CN201510929996A CN105373267A CN 105373267 A CN105373267 A CN 105373267A CN 201510929996 A CN201510929996 A CN 201510929996A CN 105373267 A CN105373267 A CN 105373267A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/048—Indexing scheme relating to G06F3/048
- G06F2203/04808—Several contacts: gestures triggering a specific function, e.g. scrolling, zooming, right-click, when the user establishes several contacts with the surface simultaneously; e.g. using several fingers or a combination of fingers and pen
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Abstract
The invention discloses a multi-point identification method of an infrared touch screen. The multi-point identification method comprises the following steps of generating a current optical network diagram; acquiring candidate touch points; determining each candidate touch point of which private light rays are more than or equal to a predetermined first threshold value as a real touch point, and updating public light rays of other candidate touch points which are not judged; judging the candidate touch points which are not judged, determining each candidate touch point of which the public light rays are smaller than a predetermined second threshold value as a non-real touch point, and updating the private light rays of the remaining candidate touch points which are not judged; and sequentially and continuously judging the remaining candidate touch points which are not judged according to the above two judgment conditions until all candidate touch points are judged. The invention also provides a multi-point identification device of the infrared touch screen and the infrared touch screen. An iterative updating method is adopted by the embodiment of the invention to remove ghost points in the candidate touch points, and the real touch points are high-accurately identified.
Description
Technical field
The present invention relates to touch-screen field, particularly relate to a kind of infrared touch screen multi-point recognition method, device and infrared touch panel.
Background technology
As a branch of computing machine touch-screen, infrared touch panel is widely used in every field with advantages such as low, easy for installation, the high anti-knock properties of its production cost, freedom from repairs.Infrared touch panel (InfraredTouchScreenTechnology) is made up of the Infrared emitting and receiving sensing element be contained on touch-screen housing, in screen surface, form infra-red detection net, any touching object can change the infrared ray on contact and realize touch screen operation.
At present, for the detection technique comparative maturity of touch point single on infrared touch panel, and two or more touch point is difficult to identify rapidly and accurately.Existing multiple spot recognition technology is generally the location that calculating by carrying out accurate touch point set (comprising true touch point and corresponding terrible point) and the large step of location true touch point two realize multiple touch points, wherein, the calculating of accurate touch point set analyzes scan-data, calculates according to analyzing data the accurate touch point set comprising terrible point (touch point of non-real) and true touch point; Location true touch point is the terrible point removed by certain method in the set of accurate touch point, and then location true touch point.Simply introduce the Crack cause of ghost point: when infrared touch panel existing touch objects, except touch area, other regions that the light be blocked passes also there will be " hole ", therefore, also may form while forming true touch point " hole " in other regions, thus define terrible point, as shown in Figure 1, when existence two and plural touch point, the horizontal ordinate of each true touch point can form a terrible point with the ordinate of other all true touch points.
The ghost point how removed in accurate touch point is a step more crucial in infrared touch panel identifying to locate true touch point.Wherein, one of prior art: logic judging method is that the centre of form in region by utilizing border, accurate touch point to surround and border judge true touch point.When distance between multiple touch point is larger, effect is better; But when the distance between multiple touch point is less, can cause asking for mistake owing to blocking mutually, especially when border, touch point overlaps mutually, the mistake on border, touch point can be caused to obtain, and then cause region, touch point ask for mistake, accurately can not judge true touch point.
Another kind of conventional multi-point recognizing method is image treating, it utilizes the relation between light information and accurate touch point be blocked to judge true touch point, the Chinese patent being 201210348040.6 as the patent No. proposes a kind of method removing ghost point: search only crossing with the accurate touch point light be blocked, then determine that the accurate touch point that the light that this is blocked passes through is true touch point.Inventor in the practice of the invention, find that the ghost point adopting the method to remove in accurate touch point can exist following problem: when being subject to the impact of various disturbing factor, such as touch frame fluorescent tube and break down one, the light path relevant to this fluorescent tube is caused to connect, or light passes the problems such as the accuracy of judgement degree in region, may cause failing to judge or misjudging of true touch point.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of infrared touch screen multi-point recognition method, device and infrared touch panel, can realize identifying true touch point accurately, reject terrible point, meet request for utilization.
The embodiment of the present invention provides a kind of infrared touch screen multi-point recognition method, comprises the steps:
S11, the light information be blocked between acquisition infrared transmitting tube and infrared receiving tube, the basis of bias light net figure generates current light net figure; Wherein, described bias light net figure is based on the gray-scale map that all light information between the infrared transmitting tube of described infrared touch panel and infrared receiving tube generate before touch-control; The gray-scale value of each pixel of described gray-scale map is the quantity of the light through this pixel;
S12, connected domain detection is carried out to the pixel point set that gray-scale value in described current light net figure is zero, using each connected domain of detecting as a candidate touch point;
S13, each the candidate touch point privately owned light number being more than or equal to default first threshold are judged to be true touch point, and successively by each publicly-owned light of true touch point described in each the publicly-owned light number of other candidate touch points do not judged of process do and subtract 1 operation; Wherein, the privately owned light number of candidate touch point described in each is the quantity of the light be blocked merely through this candidate touch point; The publicly-owned light number of candidate touch point described in each is the quantity of the light be blocked through this candidate touch point and other at least one candidate touch points;
S14, the candidate touch point do not judged to be judged, each the candidate touch point publicly-owned light number being less than default Second Threshold is judged to be non-genuine touch point, and find out the specific publicly-owned light of the candidate touch point do not judged merely through this non-genuine touch point and another in the publicly-owned light of non-genuine touch point described in each, by publicly-owned light specific described in each the privately owned light number of the candidate touch point do not judged of process do and add 1 operation;
S15, return perform step S13 continue the candidate touch point do not judged is judged, until described candidate touch point all judges.
As the improvement of such scheme, described step S11 specifically comprises:
Obtain the light information be blocked between the infrared transmitting tube of the infrared touch panel after touch-control and infrared receiving tube;
On the basis of described bias light net figure, the light that each is blocked the gray-scale value of pixel of process all subtract 1, obtain described current light net figure.
As the improvement of such scheme, described step S12 is specially:
Connected domain detection is carried out to the pixel point set that gray-scale value in described current light net figure is zero, the quantity comprising pixel is greater than each connected domain of the 3rd default threshold value as a candidate touch point.
As the improvement of such scheme, before described step S12, also comprise:
S12 ', filtering process is carried out, to remove noise to described current light net figure.
The embodiment of the present invention also provides a kind of infrared touch panel multiple spot recognition device, comprising:
Current light net figure generation unit, for obtaining the light information be blocked between infrared transmitting tube and infrared receiving tube, the basis of bias light net figure generates current light net figure; Wherein, described bias light net figure is based on the gray-scale map that all light information between the infrared transmitting tube of described infrared touch panel and infrared receiving tube generate before touch-control; The gray-scale value of each pixel of described gray-scale map is the quantity of the light through this pixel;
Candidate touch point acquiring unit, carries out connected domain detection for the pixel point set being zero to gray-scale value in described current light net figure, using each connected domain of detecting as a candidate touch point;
True touch point identifying unit, each candidate touch point for privately owned light number being more than or equal to default first threshold is judged to be true touch point, and successively by each publicly-owned light of true touch point described in each the publicly-owned light number of other candidate touch points do not judged of process do and subtract 1 operation; Wherein, the privately owned light number of candidate touch point described in each is the quantity of the light be blocked merely through this candidate touch point; The publicly-owned light number of candidate touch point described in each is the quantity of the light be blocked through this candidate touch point and other at least one candidate touch points;
Non-genuine touch point identifying unit, for judging the candidate touch point do not judged, each the candidate touch point publicly-owned light number being less than default Second Threshold is judged to be non-genuine touch point, and find out the specific publicly-owned light of the candidate touch point do not judged merely through this non-genuine touch point and another in the publicly-owned light of non-genuine touch point described in each, by publicly-owned light specific described in each the privately owned light number of the candidate touch point do not judged of process do and add 1 operation;
Judging unit, for when judging that described candidate touch point is not all determined, indicates described true touch point identifying unit to proceed to judge to the candidate touch point do not judged.
As the improvement of such scheme, described current light net figure generation unit specifically comprises:
Acquisition of information subelement, for obtaining the light information be blocked between the infrared transmitting tube of the infrared touch panel after touch-control and infrared receiving tube;
Current light net figure obtains subelement, for the basis at described bias light net figure, the light that each is blocked the gray-scale value of pixel of process all subtract 1, obtain described current light net figure.
As the improvement of such scheme, described candidate touch point acquiring unit specifically for:
Connected domain detection is carried out to the pixel point set that gray-scale value in described current light net figure is zero, the quantity comprising pixel is greater than each connected domain of the 3rd default threshold value as a candidate touch point.
As the improvement of such scheme, described infrared touch panel multiple spot recognition device also comprises:
Graphics processing unit, after generating at described current light net figure, before detecting connected domain, carries out filtering process, to remove noise to described current light net figure.
The embodiment of the present invention also provides a kind of infrared touch panel, comprises touch-screen and above-mentioned infrared touch panel multiple spot recognition device.
The infrared touch screen multi-point recognition method that the embodiment of the present invention provides, device and infrared touch panel, have following beneficial effect: count the privately owned light number of each candidate touch point and publicly-owned light number based on the light information be blocked got; First, each the candidate touch point privately owned light number being more than or equal to default first threshold is defined as true touch point, and upgrades the publicly-owned light number of other candidate touch points do not judged; Then, judge the candidate touch point do not judged, each the candidate touch point publicly-owned light number being less than default Second Threshold is defined as non-genuine touch point, and upgrades the privately owned light number of the remaining candidate touch point do not judged; Then, proceed to judge, until described candidate touch point all judges to the described remaining candidate touch point do not judged successively according to above-mentioned two decision conditions.The mode that the embodiment of the present invention adopts iteration to upgrade rejects the terrible point in candidate touch point, realizes identifying true touch point accurately.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the ghost point Crack cause that the embodiment of the present invention provides.
Fig. 2 is the schematic flow sheet of an embodiment of infrared touch screen multi-point recognition method provided by the invention.
Fig. 3 is the bias light net figure that the embodiment of the present invention provides.
Fig. 4 is the structural representation of an embodiment of infrared touch panel multiple spot recognition device provided by the invention.
Fig. 5 is the structural representation of an embodiment of the current light net figure generation unit of infrared touch panel multiple spot recognition device provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 2, is the schematic flow sheet of an embodiment of infrared touch screen multi-point recognition method provided by the invention.
The invention provides a kind of infrared touch screen multi-point recognition method, comprise step S11 ~ S15, specific as follows:
S11, obtains the light information be blocked between infrared transmitting tube and infrared receiving tube, the basis of bias light net figure generates current light net figure.
Wherein, described bias light net figure is based on the gray-scale map that all light information between the infrared transmitting tube of described infrared touch panel and infrared receiving tube generate before touch-control; The gray-scale value of each pixel of described gray-scale map is the quantity of the light through this pixel.
Preferably, before described step S11, generate described bias light net figure, see also Fig. 3, be specially:
First, all light information between the infrared transmitting tube of the infrared touch panel before touch-control and infrared receiving tube are obtained; Wherein, the acquisition of described all light information for triggering infrared transmitting tube and at least one corresponding infrared receiving tube one by one according to the order preset, and can calculate according to the infrared receiver signal of at least one infrared receiving tube of described correspondence; At least one infrared receiving tube of described correspondence at least comprises the infrared receiving tube just right with the described infrared transmitting tube of current triggering, or also comprises the adjacent or close infrared receiving tube of the infrared receiving tube just right with the described infrared transmitting tube of current triggering.
It should be noted that, the additive method that the mode of the acquisition of described all light information can also be known to the skilled person, these, all within protection scope of the present invention, do not limit at this.
Then, generation background light net figure, by each light the gray-scale value of pixel of process is accumulative adds 1; Wherein, the initial gray value of each pixel of described bias light net figure is zero.
Each light between the infrared transmitting tube of described infrared touch panel and infrared receiving tube is expressed as the straight line of described bias light net figure, using the gray-scale value of the quantity of the straight line through each pixel as this pixel, then the gray-scale value of each pixel is the numerical value determined, described bias light net figure can be a secondary background is the image of solid color, preferably, the background color of image is black.
Then described step S11 specifically comprises:
First, the light information be blocked between the infrared transmitting tube of the infrared touch panel after touch-control and infrared receiving tube is obtained.
When there is touch objects in described infrared touch panel, then be touched each light of regional occlusion, the decay of Received signal strength can be shown in infrared receiving tube one end of correspondence, therefore, can by judging that the relation between the received signal strength of each infrared receiving tube with a threshold value preset judges whether each corresponding light is blocked, that is, when received signal strength is greater than described default threshold value, then judge that corresponding light is not blocked; When received signal strength is less than described default threshold value, then judge that corresponding light is blocked; When received signal strength equals described default threshold value, both can judge that corresponding light was not blocked, also can judge that corresponding light is blocked, these can be arranged according to the actual needs, and the present invention does not do concrete restriction.
Then, on the basis of described bias light net figure, the light that each is blocked the gray-scale value of pixel of process all subtract 1, obtain described current light net figure.
Similarly, the light be blocked described in each between the infrared transmitting tube of described infrared touch panel and infrared receiving tube is expressed as the straight line of described bias light net figure; The gray-scale value of the pixel of each described straight line process is all subtracted 1, obtains described current light net figure, and record the pixel that gray-scale value reduces to zero.
Be understandable that, the straight line through each pixel determines according to the trend of this line correspondences in the light of described infrared touch panel.Because some light may make its straight line corresponded on described bias light net figure not pass this pixel due to blocking of touch objects, therefore, might not be the actual straight line through this pixel, as long as the moving towards through this pixel of the light of this line correspondences.
S12, carries out connected domain detection to the pixel point set that gray-scale value in described current light net figure is zero, using each connected domain of detecting as a candidate touch point.
In an embodiment of the invention, because the light generating described bias light net figure is discrete, the white space that interval is certain is had between adjacent ray, therefore, there is the pixel that gray-scale value is zero in described bias light net figure, is the pixel of zero corresponding to initial gray value in current light net figure; Or in described current light net figure, also there is the pixel that gray-scale value is reduced to zero in other regions for the light process of the regional occlusion that is touched, these pixels are noise, affects the judgement precision of touch point to a certain extent.Thus, before described step S12, also comprise:
S12 ', filtering process is carried out, to remove noise to described current light net figure.
Preferably, described filtering process can utilize etching operation, expansive working, at least one algorithm opened in operation, closed operation and median filtering algorithm; Wherein, described etching operation, expansive working, to open operation, closed operation and median filtering algorithm etc. be all as well known to those skilled in the art, and the present invention does not repeat at this.
Preferably, described connected domain detects at least one method that can utilize based in the image segmentation of binary map, se ed filling algorithm, watershed method and region-growing method; Wherein, the described image segmentation based on binary map, se ed filling algorithm, watershed method and region-growing method etc. are all as well known to those skilled in the art, and the present invention does not repeat at this.
In yet another embodiment of the present invention, preferably, the quantity comprising pixel is greater than each connected domain of the 3rd default threshold value as a candidate touch point; Wherein, the quantity of the pixel that the minimum grid that described the 3rd default threshold value can be formed for ray intersections all in described bias light net figure comprises, or a certain value of the quantity of the pixel that the minimum grid formed for being greater than ray intersections all in described bias light net figure comprises, these can be arranged according to the actual needs, and the present invention does not do concrete restriction.
S13, each the candidate touch point privately owned light number being more than or equal to default first threshold is judged to be true touch point, and successively by each publicly-owned light of true touch point described in each the publicly-owned light number of other candidate touch points do not judged of process do and subtract 1 operation.
Wherein, the privately owned light number of candidate touch point described in each is the quantity of the light be blocked merely through this candidate touch point; The publicly-owned light number of candidate touch point described in each is the quantity of the light be blocked through this candidate touch point and other at least one candidate touch points.
Be understandable that, the privately owned light of candidate touch point described in each refers in the light blocked in this candidate touch point, merely through this candidate touch point without the particular light ray of other candidate touch points; The publicly-owned light of candidate touch point described in each refers in the light blocked in this candidate touch point, passes through the particular light ray of this candidate touch point and other at least one candidate touch points; The light that described in each, candidate is blocked touch point is made up of the privately owned light of this candidate touch point and publicly-owned light.
Preferably, before described step S13, calculate according to the light information be blocked between the infrared transmitting tube of described infrared touch panel and infrared receiving tube the light information that described in each, candidate is blocked touch point, be specially:
First, with the light be blocked between the infrared transmitting tube of described infrared touch panel and infrared receiving tube for target data set, for the light that candidate touch point described in each and this candidate touch point are blocked, set up index, and calculate the sum of the light that candidate is blocked touch point described in each.
Then, according to described index, calculate the quantity of the light that candidate is blocked separately touch point described in each, be called the privately owned light number of this candidate touch point.
Finally, the privately owned light number that the sum of light candidate described in each blocked touch point deducts this candidate touch point obtains the publicly-owned light number of this candidate touch point.
Preferably, described default first threshold is 1.In theory, as long as have a light merely through a certain candidate touch point, just can judge that this candidate touch point is as true touch point, therefore, described default first threshold is set to 1 usually, but also can be greater than 1 numerical value, these can be arranged according to the actual needs, and the present invention does not do concrete restriction.
In the specific implementation, preferably, using at least one maximum for the quantity comprising pixel in the described candidate touch point obtained in described step S12 candidate touch points as the starting point of going pseudo-operation.Reason is, at least one candidate touch point that the described quantity comprising pixel is maximum is exactly most possibly true touch point, therefore, at least one candidate touch point that the quantity of pixel is maximum is comprised described in judging at first, comparatively large on the renewal impact of the light information of the candidate touch point that other do not judge, whole efficiency of going pseudo-operation can be improved to a certain extent.
Be understandable that, in the publicly-owned light of a certain described true touch point, there is two or more publicly-owned light all through the same candidate touch point do not judged, then the publicly-owned light number of this candidate touch point do not judged correspondingly does the operation subtracting more than 2 or 2 numerical value.
S14, the candidate touch point do not judged is judged, each the candidate touch point publicly-owned light number being less than default Second Threshold is judged to be non-genuine touch point, and find out the specific publicly-owned light of the candidate touch point do not judged merely through this non-genuine touch point and another in the publicly-owned light of non-genuine touch point described in each, by publicly-owned light specific described in each the privately owned light number of the candidate touch point do not judged of process do and add 1 operation.
Preferably, described default Second Threshold is relevant with the minimum touch precision of described infrared touch panel, can be set as allowing that the quantity of the light that minimum touch objects may be blocked is multiplied by the ratio value that is less than 1, these can be arranged according to the actual needs, and the present invention does not do concrete restriction.
Similarly, in the publicly-owned light of a certain described non-genuine touch point, there is two or more specific total light all extend only through this non-genuine touch point and another candidate touch point do not judged, then the privately owned light number of this candidate touch point do not judged correspondingly does the operation adding more than 2 or 2 numerical value.
S15, returns execution step S13 and continues to judge the candidate touch point do not judged, until described candidate touch point all judges.
In the middle of concrete enforcement, preferably, above-mentioned infrared touch screen multi-point recognition method can be performed by infrared touch panel multiple spot recognition device.The privately owned light number of each candidate touch point and publicly-owned light number is counted based on the light information be blocked got; First, each the candidate touch point privately owned light number being more than or equal to default first threshold is defined as true touch point, and upgrades the publicly-owned light number of other candidate touch points do not judged; Then, judge the candidate touch point do not judged, each the candidate touch point publicly-owned light number being less than default Second Threshold is defined as non-genuine touch point, and upgrades the privately owned light number of the remaining candidate touch point do not judged; Then, proceed to judge, until described candidate touch point all judges to the described remaining candidate touch point do not judged successively according to above-mentioned two decision conditions.The mode that the embodiment of the present invention adopts iteration to upgrade rejects the terrible point in candidate touch point, realizes identifying true touch point accurately.
Correspondingly, the present invention also provides a kind of infrared touch panel multiple spot recognition device, can perform all flow processs of the infrared touch screen multi-point recognition method that above-described embodiment provides.
Referring to Fig. 4, is the structural representation of an embodiment of infrared touch panel multiple spot recognition device provided by the invention.
The invention provides a kind of infrared touch panel multiple spot recognition device 40, comprise current light net figure generation unit 41, candidate touch point acquiring unit 42, true touch point identifying unit 43, non-genuine touch point identifying unit 44 and judging unit 45, specific as follows:
Described current light net figure generation unit 41, for obtaining the light information be blocked between infrared transmitting tube and infrared receiving tube, the basis of bias light net figure generates current light net figure.
Wherein, described bias light net figure is based on the gray-scale map that all light information between the infrared transmitting tube of described infrared touch panel and infrared receiving tube generate before touch-control; The gray-scale value of each pixel of described gray-scale map is the quantity of the light through this pixel.
Described candidate touch point acquiring unit 42, carries out connected domain detection for the pixel point set being zero to gray-scale value in described current light net figure, using each connected domain of detecting as a candidate touch point.
Described true touch point identifying unit 43, each candidate touch point for privately owned light number being more than or equal to default first threshold is judged to be true touch point, and successively by each publicly-owned light of true touch point described in each the publicly-owned light number of other candidate touch points do not judged of process do and subtract 1 operation.
Wherein, the privately owned light number of candidate touch point described in each is the quantity of the light be blocked merely through this candidate touch point; The publicly-owned light number of candidate touch point described in each is the quantity of the light be blocked through this candidate touch point and other at least one candidate touch points.
Described non-genuine touch point identifying unit 44, for judging the candidate touch point do not judged, each the candidate touch point publicly-owned light number being less than default Second Threshold is judged to be non-genuine touch point, and find out the specific publicly-owned light of the candidate touch point do not judged merely through this non-genuine touch point and another in the publicly-owned light of non-genuine touch point described in each, by publicly-owned light specific described in each the privately owned light number of the candidate touch point do not judged of process do and add 1 operation.
Described judging unit 45, for when judging that described candidate touch point is not all determined, indicates described true touch point identifying unit to proceed to judge to the candidate touch point do not judged.
In the specific implementation, see also Fig. 5, described current light net figure generation unit 41 specifically comprises:
Acquisition of information subelement 411, for obtaining the light information be blocked between the infrared transmitting tube of the infrared touch panel after touch-control and infrared receiving tube.
Current light net figure obtains subelement 412, for the basis at described bias light net figure, the light that each is blocked the gray-scale value of pixel of process all subtract 1, obtain described current light net figure.
In an embodiment of the invention, described infrared touch panel multiple spot recognition device 40 also comprises:
Graphics processing unit 46, after generating at described current light net figure, before detecting connected domain, carries out filtering process, to remove noise to described current light net figure.
In yet another embodiment of the present invention, described candidate touch point acquiring unit 42 specifically for:
Connected domain detection is carried out to the pixel point set that gray-scale value in described current light net figure is zero, the quantity comprising pixel is greater than each connected domain of the 3rd default threshold value as a candidate touch point.
Be understandable that, the function of each functional unit of the infrared touch panel multiple spot recognition device 40 in the embodiment of the present invention can according to the method specific implementation in said method embodiment, its specific implementation process with reference to the associated description of said method embodiment, can repeat no more herein.
In the middle of concrete enforcement, count the privately owned light number of each candidate touch point and publicly-owned light number based on the light information be blocked got; First, each candidate touch point that privately owned light number is more than or equal to default first threshold by described true touch point identifying unit 43 is defined as true touch point, and upgrades the publicly-owned light number of other candidate touch points do not judged; Then, described non-genuine touch point identifying unit 44 judges the candidate touch point do not judged, each the candidate touch point publicly-owned light number being less than default Second Threshold is defined as non-genuine touch point, and upgrades the privately owned light number of the remaining candidate touch point do not judged; Then, when described judging unit 45 judges that described candidate touch point is not all determined, described true touch point identifying unit 43 and described non-genuine touch point identifying unit 44 is indicated to proceed to judge, until described candidate touch point all judges to the described remaining candidate touch point do not judged successively.The mode that the embodiment of the present invention adopts iteration to upgrade rejects the terrible point in candidate touch point, realizes identifying true touch point accurately.
In addition, the present invention also provides a kind of infrared touch panel.
The invention provides a kind of infrared touch panel, comprise touch-screen and above-mentioned infrared touch panel multiple spot recognition device 40.
The infrared touch screen multi-point recognition method that the embodiment of the present invention provides, device and infrared touch panel, have following beneficial effect: count the privately owned light number of each candidate touch point and publicly-owned light number based on the light information be blocked got; First, each the candidate touch point privately owned light number being more than or equal to default first threshold is defined as true touch point, and upgrades the publicly-owned light number of other candidate touch points do not judged; Then, judge the candidate touch point do not judged, each the candidate touch point publicly-owned light number being less than default Second Threshold is defined as non-genuine touch point, and upgrades the privately owned light number of the remaining candidate touch point do not judged; Then, proceed to judge, until described candidate touch point all judges to the described remaining candidate touch point do not judged successively according to above-mentioned two decision conditions.The mode that the embodiment of the present invention adopts iteration to upgrade rejects the terrible point in candidate touch point, realizes identifying true touch point accurately.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly the interest field of the present invention can not be limited with this, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and according to the equivalent variations that the claims in the present invention are done, still belong to the scope that invention is contained.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory, ROM) or random store-memory body (RandomAccessMemory, RAM) etc.
Claims (9)
1. an infrared touch screen multi-point recognition method, is characterized in that, comprises the steps:
S11, the light information be blocked between acquisition infrared transmitting tube and infrared receiving tube, the basis of bias light net figure generates current light net figure; Wherein, described bias light net figure is based on the gray-scale map that all light information between the infrared transmitting tube of described infrared touch panel and infrared receiving tube generate before touch-control; The gray-scale value of each pixel of described gray-scale map is the quantity of the light through this pixel;
S12, connected domain detection is carried out to the pixel point set that gray-scale value in described current light net figure is zero, using each connected domain of detecting as a candidate touch point;
S13, each the candidate touch point privately owned light number being more than or equal to default first threshold are judged to be true touch point, and successively by each publicly-owned light of true touch point described in each the publicly-owned light number of other candidate touch points do not judged of process do and subtract 1 operation; Wherein, the privately owned light number of candidate touch point described in each is the quantity of the light be blocked merely through this candidate touch point; The publicly-owned light number of candidate touch point described in each is the quantity of the light be blocked through this candidate touch point and other at least one candidate touch points;
S14, the candidate touch point do not judged to be judged, each the candidate touch point publicly-owned light number being less than default Second Threshold is judged to be non-genuine touch point, and find out the specific publicly-owned light of the candidate touch point do not judged merely through this non-genuine touch point and another in the publicly-owned light of non-genuine touch point described in each, by publicly-owned light specific described in each the privately owned light number of the candidate touch point do not judged of process do and add 1 operation;
S15, return perform step S13 continue the candidate touch point do not judged is judged, until described candidate touch point all judges.
2. infrared touch screen multi-point recognition method as claimed in claim 1, it is characterized in that, described step S11 specifically comprises:
Obtain the light information be blocked between the infrared transmitting tube of the infrared touch panel after touch-control and infrared receiving tube;
On the basis of described bias light net figure, the light that each is blocked the gray-scale value of pixel of process all subtract 1, obtain described current light net figure.
3. infrared touch screen multi-point recognition method as claimed in claim 1, it is characterized in that, described step S12 is specially:
Connected domain detection is carried out to the pixel point set that gray-scale value in described current light net figure is zero, the quantity comprising pixel is greater than each connected domain of the 3rd default threshold value as a candidate touch point.
4. the infrared touch screen multi-point recognition method as described in any one of claims 1 to 3, is characterized in that, before described step S12, also comprises:
S12 ', filtering process is carried out, to remove noise to described current light net figure.
5. an infrared touch panel multiple spot recognition device, is characterized in that, comprising:
Current light net figure generation unit, for obtaining the light information be blocked between infrared transmitting tube and infrared receiving tube, the basis of bias light net figure generates current light net figure; Wherein, described bias light net figure is based on the gray-scale map that all light information between the infrared transmitting tube of described infrared touch panel and infrared receiving tube generate before touch-control; The gray-scale value of each pixel of described gray-scale map is the quantity of the light through this pixel;
Candidate touch point acquiring unit, carries out connected domain detection for the pixel point set being zero to gray-scale value in described current light net figure, using each connected domain of detecting as a candidate touch point;
True touch point identifying unit, each candidate touch point for privately owned light number being more than or equal to default first threshold is judged to be true touch point, and successively by each publicly-owned light of true touch point described in each the publicly-owned light number of other candidate touch points do not judged of process do and subtract 1 operation; Wherein, the privately owned light number of candidate touch point described in each is the quantity of the light be blocked merely through this candidate touch point; The publicly-owned light number of candidate touch point described in each is the quantity of the light be blocked through this candidate touch point and other at least one candidate touch points;
Non-genuine touch point identifying unit, for judging the candidate touch point do not judged, each the candidate touch point publicly-owned light number being less than default Second Threshold is judged to be non-genuine touch point, and find out the specific publicly-owned light of the candidate touch point do not judged merely through this non-genuine touch point and another in the publicly-owned light of non-genuine touch point described in each, by publicly-owned light specific described in each the privately owned light number of the candidate touch point do not judged of process do and add 1 operation;
Judging unit, for when judging that described candidate touch point is not all determined, indicates described true touch point identifying unit to proceed to judge to the candidate touch point do not judged.
6. infrared touch panel multiple spot recognition device as claimed in claim 5, it is characterized in that, described current light net figure generation unit specifically comprises:
Acquisition of information subelement, for obtaining the light information be blocked between the infrared transmitting tube of the infrared touch panel after touch-control and infrared receiving tube;
Current light net figure obtains subelement, for the basis at described bias light net figure, the light that each is blocked the gray-scale value of pixel of process all subtract 1, obtain described current light net figure.
7. infrared touch panel multiple spot recognition device as claimed in claim 5, is characterized in that, described candidate touch point acquiring unit specifically for:
Connected domain detection is carried out to the pixel point set that gray-scale value in described current light net figure is zero, the quantity comprising pixel is greater than each connected domain of the 3rd default threshold value as a candidate touch point.
8. the infrared touch panel multiple spot recognition device as described in any one of claim 5 to 7, is characterized in that, described infrared touch panel multiple spot recognition device also comprises:
Graphics processing unit, after generating at described current light net figure, before detecting connected domain, carries out filtering process, to remove noise to described current light net figure.
9. an infrared touch panel, is characterized in that, comprises and touches frame and the infrared touch panel multiple spot recognition device as described in any one of claim 5 to 8.
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| CN112068737A (en) * | 2020-09-03 | 2020-12-11 | 广州华欣电子科技有限公司 | Infrared touch screen signal conditioning circuit and method |
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| CN105373267B (en) | 2018-09-18 |
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