CN105373267B - A kind of infrared touch screen multi-point recognition method, device and infrared touch panel - Google Patents
A kind of infrared touch screen multi-point recognition method, device and infrared touch panel Download PDFInfo
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- CN105373267B CN105373267B CN201510929996.9A CN201510929996A CN105373267B CN 105373267 B CN105373267 B CN 105373267B CN 201510929996 A CN201510929996 A CN 201510929996A CN 105373267 B CN105373267 B CN 105373267B
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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 kind of infrared touch screen multi-point recognition methods, include the following steps：Generate current light net figure；Obtain candidate touch point；Each candidate touch point that privately owned light number is greater than or equal to preset first threshold is determined as true touch point, and updates the publicly-owned light number for the candidate touch point that other do not judge；The candidate touch point not judged is judged, each candidate touch point by publicly-owned light number less than preset second threshold is determined as non-genuine touch point, and updates the privately owned light number of the remaining candidate touch point not judged；Successively the remaining candidate touch point not judged is continued to judge according to above-mentioned two decision condition, until candidate touch point all judges.The present invention also provides a kind of infrared touch panel multiple spot identification device and infrared touch panels.The embodiment of the present invention rejects the terrible point in candidate touch point using the newer mode of iteration, and realization accurately identifies true touch point.
Description
Technical field
The present invention relates to touch screen field more particularly to a kind of infrared touch screen multi-point recognition method, device and infrared touch
Touch screen.
Background technology
As a branch of computer touch screen, infrared touch panel low, easy for installation, high antiknock with its production cost
The advantages that property, freedom from repairs and be widely used in every field.Infrared touch panel (Infrared Touch Screen
Technology it) is made of the Infrared emitting and receiving sensing element on touch screen outline border, in screen surface, is formed
Infra-red detection net, any touching object can be changed the infrared ray on contact and realize touch screen operation.
Currently, for the detection technique comparative maturity of single touch point on infrared touch panel, and for two or two
A above touch point is but difficult rapidly and accurately to identify.Existing multiple spot identification technology touches point set generally by standard is carried out
The calculating and positioning two big step of true touch point of (including true touch point and corresponding terrible point) are closed to realize determining for multiple touch points
Position, wherein the calculating that standard touches point set is analyzed scan data, includes that terrible point is (non-real according to analysis data calculating
Touch point) and true touch point including accurate touch point set；Positioning true touch point is to remove standard by certain method
The terrible point in point set is touched, and then positions true touch point.The simple Crack cause for introducing ghost point：Work as infrared touch panel
On there are when touch objects, in addition to touch area, other regions that the light that is blocked passes through also will appear " hole ", therefore,
" hole " that other regions may also be constituted while constituting true touch point, so as to form terrible point, as shown in Figure 1, when depositing
In two and more than two touch points, the abscissa of each true touch point can be with other all true touch points
Ordinate constitutes a terrible point.
How to remove in quasi- touch point ghost point come position true touch point be in infrared touch panel identification process it is more crucial
A step.Wherein, one of prior art：Logic judging method is the centre of form by using quasi- touch point boundary area defined
Judge true touch point with boundary.When the distance between multiple touch points are larger, effect is preferable；But in multiple touch points
The distance between it is smaller when, due to blocking mutually can lead to seek mistake, especially when touch point boundary mutually coincides, can make
It is obtained at the mistake on touch point boundary, and then lead to touch point region seeks mistake, it is impossible to enough be accurately judged to really touch
It touches a little.
Another common multi-point recognizing method is image treating, it is touched with accurate using the light information being blocked
Relationship between point judges true touch point, as the Chinese patent of Patent No. 201210348040.6 proposes that a kind of removal is terrible
The method of point：Search the light being blocked that only intersects with a quasi- touch point, it is determined that the light being blocked by standard
Touch point is true touch point.Inventor is in implementing the present invention, it may, have found to remove in quasi- touch point using this method
Ghost point can have the following problems：Influenced when by various disturbing factors, such as touching box fluorescent tube breaks down one, cause and this
The problems such as relevant light path of fluorescent tube is not turned on or the accuracy of judgement in region is passed through to spend for light, is likely to result in actual touch
Point is failed to judge or is misjudged.
Invention content
In view of the above-mentioned problems, the purpose of the present invention is to provide a kind of infrared touch screen multi-point recognition method, devices and red
Outer touch screen can be realized and accurately identify true touch point, reject terrible point, meet requirement.
The embodiment of the present invention provides a kind of infrared touch screen multi-point recognition method, includes the following steps：
S11, the light information being blocked between infrared transmitting tube and infrared receiving tube is obtained, on the basis of bias light net figure
It is upper to generate current light net figure；Wherein, the bias light net figure be infrared transmitting tube before touch-control based on the infrared touch panel and
All light informations between infrared receiving tube and the gray-scale map generated；The gray value of each pixel of the gray-scale map is
By the quantity of the light of the pixel；
S12, the pixel point set for being zero to gray value in the current light net figure carry out connected domain detection, every by what is detected
One connected domain is as a candidate touch point；
S13, each candidate touch point that privately owned light number is greater than or equal to preset first threshold are judged to really touching
Other the candidate touch points not judged touched a little, and successively passed through each publicly-owned light of each true touch point
Publicly-owned light number does the operation that subtracts 1；Wherein, the privately owned light number of each candidate touch point is merely through the candidate touch point
The quantity for the light being blocked；The publicly-owned light number of each candidate touch point be by the candidate touch point and other extremely
The quantity for the light of a few candidate touch point being blocked；
S14, the candidate touch point not judged is judged, publicly-owned light number is each less than preset second threshold
Candidate touch point is determined as non-genuine touch point, and finds out in the publicly-owned light of each non-genuine touch point merely through this
The specific publicly-owned light of non-genuine touch point and another candidate touch point not judged, by each specific publicly-owned light
The privately owned light number for the candidate touch point not judged passed through is done plus 1 operation；
S15, it returns to step S13 and continues to judge the candidate touch point not judged, candidate touched until described
Point is all until judgement.
As the improvement of said program, the step S11 is specifically included：
Obtain the light information being blocked between the infrared transmitting tube and infrared receiving tube of the infrared touch panel after touch-control；
On the basis of the bias light net figure, the gray value for the pixel that the light that each is blocked is passed through is equal
Subtract 1, obtains the current light net figure.
As the improvement of said program, the step S12 is specially：
The pixel point set for being zero to gray value in the current light net figure carries out connected domain detection, by the number comprising pixel
Amount is more than each connected domain of preset third threshold value as a candidate touch point.
As the improvement of said program, before the step S12, further include：
S12 ', the current light net figure is filtered, to remove noise.
The embodiment of the present invention also provides a kind of infrared touch panel multiple spot identification device, including：
Current light net figure generation unit, for obtaining the light being blocked between infrared transmitting tube and infrared receiving tube letter
Breath, current light net figure is generated on the basis of bias light net figure；Wherein, the bias light net figure is before touch-control based on described infrared
All light informations between the infrared transmitting tube and infrared receiving tube of touch screen and the gray-scale map generated；The gray-scale map it is every
The gray value of one pixel is the quantity by the light of the pixel；
Candidate touch point acquiring unit, for be zero to gray value in the current light net figure pixel point set be connected to
Domain is detected, using each connected domain detected as a candidate touch point；
True touch point judging unit, each candidate for privately owned light number to be greater than or equal to preset first threshold
Touch point is determined as true touch point, and each publicly-owned light of each true touch point is passed through successively other not
The publicly-owned light number of the candidate touch point of judgement does the operation that subtracts 1；Wherein, the privately owned light number of each candidate touch point is only
By the quantity for the light of the candidate touch point being blocked；The publicly-owned light number of each candidate touch point is by the time
Select the quantity for the light of touch point and other at least one candidate touch points being blocked；
Non-genuine touch point judging unit is few by publicly-owned light number for judging the candidate touch point not judged
It is determined as non-genuine touch point in each candidate touch point of preset second threshold, and finds out each non-genuine touch
Point publicly-owned light in merely through the non-genuine touch point and another candidate touch point not judged specific publicly-owned light,
The privately owned light number for the candidate touch point not judged that each specific publicly-owned light is passed through is done plus 1 operates；
Judging unit, for when judging that the candidate touch point is not determined all, indicating that the true touch point is sentenced
Order member continues to judge to the candidate touch point not judged.
As the improvement of said program, the current light net figure generation unit specifically includes：
Acquisition of information subelement, between the infrared transmitting tube and infrared receiving tube for obtaining the infrared touch panel after touch-control
The light information being blocked；
Current light net figure obtains subelement, the light on the basis of the bias light net figure, each to be blocked
The gray value for the pixel that line is passed through subtracts 1, obtains the current light net figure.
As the improvement of said program, candidate touch point acquiring unit is specifically used for：
The pixel point set for being zero to gray value in the current light net figure carries out connected domain detection, by the number comprising pixel
Amount is more than each connected domain of preset third threshold value as a candidate touch point.
As the improvement of said program, the infrared touch panel multiple spot identification device further includes：
Image processing unit, after being generated in the current light net figure, before detecting connected domain, to the current light
Net figure is filtered, to remove noise.
The embodiment of the present invention also provides a kind of infrared touch panel, including touch screen and above-mentioned infrared touch panel multiple spot are known
Other device.
Infrared touch screen multi-point recognition method, device and infrared touch panel provided in an embodiment of the present invention, have has as follows
Beneficial effect：The privately owned light number of each candidate touch point and publicly-owned light are counted based on the light information being blocked got
Number；First, each candidate touch point for privately owned light number being greater than or equal to preset first threshold is determined as true touch point,
And update the publicly-owned light number for the candidate touch point that other do not judge；Then, the candidate touch point not judged is judged, it will
Publicly-owned light number is determined as non-genuine touch point less than each candidate touch point of preset second threshold, and update it is remaining not
The privately owned light number of the candidate touch point of judgement；Then, remaining do not judged to described successively according to above-mentioned two decision condition
Candidate touch point continue to judge, until the candidate touch point all judges.The embodiment of the present invention uses iteration
Newer mode rejects the terrible point in candidate touch point, and realization accurately identifies true touch point.
Description of the drawings
In order to illustrate more clearly of technical scheme of the present invention, attached drawing needed in embodiment will be made below
Simply introduce, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, general for this field
For logical technical staff, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is the schematic diagram of ghost point Crack cause provided in an embodiment of the present invention.
Fig. 2 is the flow diagram of one embodiment of infrared touch screen multi-point recognition method provided by the invention.
Fig. 3 is bias light net figure provided in an embodiment of the present invention.
Fig. 4 is the structural schematic diagram of one embodiment of infrared touch panel multiple spot identification device provided by the invention.
Fig. 5 is an implementation of the current light net figure generation unit of infrared touch panel multiple spot identification device provided by the invention
The structural schematic diagram of example.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 2, being the flow signal of one embodiment of infrared touch screen multi-point recognition method provided by the invention
Figure.
The present invention provides a kind of infrared touch screen multi-point recognition method, including step S11~S15, specific as follows：
S11 obtains the light information being blocked between infrared transmitting tube and infrared receiving tube, on the basis of bias light net figure
It is upper to generate current light net figure.
Wherein, the bias light net figure is infrared transmitting tube and infrared receiving tube based on the infrared touch panel before touch-control
Between all light informations and the gray-scale map that generates；The gray value of each pixel of the gray-scale map is by the pixel
The quantity of the light of point.
Preferably, before the step S11, the bias light net figure is generated, also referring to Fig. 3, specially：
First, all light letter between the infrared transmitting tube and infrared receiving tube of the infrared touch panel before touch-control is obtained
Breath；Wherein, the acquisition of all light informations can be to trigger infrared transmitting tube and corresponding one by one according to preset sequence
At least one infrared receiving tube, and calculated according to the infrared receiver signal of corresponding at least one infrared receiving tube
It arrives；Corresponding at least one infrared receiving tube is included at least and is connect with the infrared of infrared transmitting tube face currently triggered
Closed tube, or further include adjacent with the infrared receiving tube of infrared transmitting tube face currently triggered or similar infrared receiver
Pipe.
It should be noted that the mode of the acquisition of all light informations can also be known to the skilled person
Other methods, these within protection scope of the present invention, are not limited herein.
Then, bias light net figure is generated, the gray value for the pixel that each light is passed through is accumulative to add 1；Wherein, institute
The initial gray value for stating each pixel of bias light net figure is zero.
Each light between the infrared transmitting tube and infrared receiving tube of the infrared touch panel is expressed as the background
The straight line of light net figure, will by each pixel straight line quantity as the gray value of the pixel, then each
The gray value of pixel is all a determining numerical value, and the bias light net figure can be the figure that a secondary background is solid color
Picture, it is preferred that the background color of image is black.
Then the step S11 is specifically included：
First, the light being blocked between the infrared transmitting tube and infrared receiving tube of the infrared touch panel after touch-control is obtained
Information.
When on the infrared touch panel there are when touch objects, then each light blocked by touch area, corresponding
Infrared receiving tube one end can show to receive the decaying of signal, therefore, can be by judging that the reception of each infrared receiving tube is believed
Relationship number between intensity and a preset threshold value judges whether corresponding each light is blocked, that is to say, that works as reception
When signal strength is more than the preset threshold value, then judge that corresponding light is not blocked；Described in being less than when received signal strength
When preset threshold value, then judge that corresponding light is blocked；It, both can be with when received signal strength is equal to the preset threshold value
Judge that corresponding light is not blocked, can also judge that corresponding light is blocked, these can be set according to the actual needs
It sets, the present invention does not do specific restriction.
Then, on the basis of the bias light net figure, the ash for the pixel that the light that each is blocked is passed through
Angle value subtracts 1, obtains the current light net figure.
Similarly, each between the infrared transmitting tube and infrared receiving tube of the infrared touch panel described is blocked
Light is expressed as the straight line of the bias light net figure；The gray value for the pixel that straight line described in each passes through is subtracted 1,
The current light net figure is obtained, and records the pixel that gray value reduces to zero.
It is understood that being according to the line correspondences in the infrared touch panel by the straight line of each pixel
Moving towards for light is determining.Since some light may make it correspond to the bias light net due to blocking for touch objects
Straight line on figure cannot pass through the pixel, therefore, not necessarily actually cut through the straight line of the pixel, as long as the line correspondences
Light trend pass through the pixel.
S12, the pixel point set for being zero to gray value in the current light net figure carries out connected domain detection, every by what is detected
One connected domain is as a candidate touch point.
In an embodiment of the invention, since the light for generating the bias light net figure is discrete, adjacent light
It is had between line and is spaced certain white space, therefore, there are the pixels that gray value is zero in the bias light net figure, corresponding
The pixel that initial gray value is zero in current light net figure；Or in the current light net figure, for being hidden by touch area
Other regions that the light of gear passes through are there is also the pixel that gray value is reduced to zero, these pixels are noise, certain
The judgement precision of touch point is influenced in degree.Thus, before the step S12, further include：
S12 ', the current light net figure is filtered, to remove noise.
Preferably, described be filtered can utilize etching operation, expansive working, open operation, closed operation and medium filtering
At least one of algorithm algorithm；Wherein, the etching operation, expansive working, open operation, closed operation and median filtering algorithm etc.
All it is as well known to those skilled in the art, this will not be repeated here by the present invention.
Preferably, connected domain detection can utilize image segmentation based on binary map, se ed filling algorithm, watershed
At least one of method and region-growing method method；Wherein, the image segmentation based on binary map, se ed filling algorithm, point
Water ridge method and region-growing method etc. are all as well known to those skilled in the art, and this will not be repeated here by the present invention.
In yet another embodiment of the present invention, it is preferred that the quantity comprising pixel is more than preset third threshold
Each connected domain of value is as a candidate touch point；Wherein, the preset third threshold value can be the bias light net figure
In the minimum grid that is formed of all ray intersection pixel that is included quantity, or for more than in the bias light net figure
The a certain value of the quantity for the pixel that the minimum grid that all ray intersections are formed is included, these can be according to the actual needs
It is configured, the present invention does not do specific restriction.
S13, each candidate touch point that privately owned light number is greater than or equal to preset first threshold are judged to really touching
Other the candidate touch points not judged touched a little, and successively passed through each publicly-owned light of each true touch point
Publicly-owned light number does the operation that subtracts 1.
Wherein, the privately owned light number of each candidate touch point is the light being blocked merely through the candidate touch point
Quantity；The publicly-owned light number of each candidate touch point is to be touched by the candidate touch point and other at least one candidates
Touch the quantity of the light being blocked a little.
It is understood that the privately owned light of each candidate touch point refers to the light blocked in the candidate touch point
In line, merely through the candidate touch point without the particular light ray of other candidate touch points；Each candidate touch point
Publicly-owned light refers in the light that the candidate touch point is blocked, by the candidate touch point and other at least one candidates
The particular light ray of touch point；The light that each candidate touch point is blocked is by the privately owned light of the candidate touch point and publicly-owned
Light forms.
Preferably, before the step S13, according to the infrared transmitting tube of the infrared touch panel and infrared receiving tube it
Between the light information being blocked calculate the light information that each candidate touch point is blocked, specially：
First, using the light being blocked between the infrared transmitting tube of the infrared touch panel and infrared receiving tube as target
Data set establishes index, and calculate each institute for the light that each candidate touch point is blocked with the candidate touch point
State the sum for the light that candidate touch point is blocked.
Then, according to the index, the quantity for the light that each candidate touch point is individually blocked, the referred to as time are calculated
Select the privately owned light number of touch point.
Finally, the sum for the light that each candidate touch point is blocked is subtracted to the privately owned light number of the candidate touch point
Obtain the publicly-owned light number of the candidate touch point.
Preferably, the preset first threshold is 1.In theory, as long as there is a light merely through a certain time
Select touch point, so that it may which, to judge the candidate touch point as true touch point, therefore, the preset first threshold is usually arranged as
1 but it is also possible to be the numerical value more than 1, these can be configured according to the actual needs, and the present invention does not do specific restriction.
In the specific implementation, it is preferred that will include pixel in the candidate touch point that obtained in the step S12
The most at least one candidate touch point of quantity is as the starting point for going pseudo-operation.The reason is that the quantity for including pixel
Most at least one candidate touch points are exactly most possibly true touch point, and therefore, the described judgement at first includes pixel
The most at least one candidate touch point of quantity, on the update of the light information of other candidate touch points not judged influence compared with
Greatly, the entire efficiency for going pseudo-operation can be improved to a certain extent.
It is understood that when there are two or more publicly-owned light in the publicly-owned light of a certain true touch point
Line passes through the same candidate touch point not judged, then the publicly-owned light number of the candidate touch point not judged, which is correspondingly done, subtracts 2
Or 2 or more numerical value operation.
S14 judges the candidate touch point not judged, and publicly-owned light number is each less than preset second threshold
Candidate touch point is determined as non-genuine touch point, and finds out in the publicly-owned light of each non-genuine touch point merely through this
The specific publicly-owned light of non-genuine touch point and another candidate touch point not judged, by each specific publicly-owned light
The privately owned light number for the candidate touch point not judged passed through is done plus 1 operation.
Preferably, the preset second threshold is related with the minimum precision that touches of the infrared touch panel, may be set to
Allow the quantity for the light that minimum touch objects may block be multiplied by one be less than 1 ratio value, these can be according to the actual needs
It is configured, the present invention does not do specific restriction.
Similarly, when there are two or more specific shared light in the publicly-owned light of a certain non-genuine touch point
Line extends only through the non-genuine touch point and another candidate touch point not judged, then the candidate touch point not judged
Privately owned light number is correspondingly done plus the operation of 2 or 2 or more numerical value.
S15 returns to step S13 and continues to judge the candidate touch point not judged, until the candidate touch
Point is all until judgement.
In specific implementation, it is preferred that above-mentioned infrared touch screen multi-point recognition method can be known by infrared touch panel multiple spot
Other device executes.The privately owned light number and public affairs of each candidate touch point are counted based on the light information being blocked got
There is light number；First, each candidate touch point that privately owned light number is greater than or equal to preset first threshold is determined as really
Touch point, and update the publicly-owned light number for the candidate touch point that other do not judge；Then, the candidate touch point not judged is carried out
Judgement, each candidate touch point by publicly-owned light number less than preset second threshold is determined as non-genuine touch point, and updates
The privately owned light number of the remaining candidate touch point not judged；Then, according to above-mentioned two decision condition successively to described remaining
The candidate touch point not judged continue to judge, until the candidate touch point all judges.The embodiment of the present invention
Terrible point in candidate touch point is rejected using the newer mode of iteration, realization accurately identifies true touch point.
Correspondingly, the present invention also provides a kind of infrared touch panel multiple spot identification device, it can perform what above-described embodiment provided
All flows of infrared touch screen multi-point recognition method.
Referring to Fig. 4, being the structural representation of one embodiment of infrared touch panel multiple spot identification device provided by the invention
Figure.
The present invention provides a kind of infrared touch panel multiple spot identification device 40, including current light net figure generation unit 41, candidate
Touch point acquiring unit 42, true touch point judging unit 43, non-genuine touch point judging unit 44 and judging unit 45, tool
Body is as follows：
The current light net figure generation unit 41, for obtaining the light being blocked between infrared transmitting tube and infrared receiving tube
Line information generates current light net figure on the basis of bias light net figure.
Wherein, the bias light net figure is infrared transmitting tube and infrared receiving tube based on the infrared touch panel before touch-control
Between all light informations and the gray-scale map that generates；The gray value of each pixel of the gray-scale map is by the pixel
The quantity of the light of point.
Candidate's touch point acquiring unit 42, for be zero to gray value in the current light net figure pixel point set into
Row connected domain detects, using each connected domain detected as a candidate touch point.
The true touch point judging unit 43, for privately owned light number to be greater than or equal to the every of preset first threshold
One candidate touch point is determined as true touch point, and successively passed through each publicly-owned light of each true touch point
The publicly-owned light number of other candidate touch points not judged does the operation that subtracts 1.
Wherein, the privately owned light number of each candidate touch point is the light being blocked merely through the candidate touch point
Quantity；The publicly-owned light number of each candidate touch point is to be touched by the candidate touch point and other at least one candidates
Touch the quantity of the light being blocked a little.
The non-genuine touch point judging unit 44, for judging the candidate touch point not judged, by publicly-owned light
Line number is determined as non-genuine touch point less than each candidate touch point of preset second threshold, and finds out each described non-real
Merely through the specific public affairs of the non-genuine touch point and another candidate touch point not judged in the publicly-owned light of real touch point
There is light, the privately owned light number for the candidate touch point not judged that each specific publicly-owned light is passed through is done plus 1 operates.
The judging unit 45, it is described true tactile for when judging that the candidate touch point is not determined all, indicating
It touches a judging unit the candidate touch point not judged is continued to judge.
In the specific implementation, please refer to fig. 5, the current light net figure generation unit 41 specifically includes：
Acquisition of information subelement 411, infrared transmitting tube and infrared receiving tube for obtaining the infrared touch panel after touch-control
Between the light information being blocked.
Current light net figure obtains subelement 412, on the basis of the bias light net figure, each to be blocked
The gray value for the pixel that light is passed through subtracts 1, obtains the current light net figure.
In an embodiment of the invention, the infrared touch panel multiple spot identification device 40 further includes：
Image processing unit 46, after being generated in the current light net figure, before detecting connected domain, to described current
Light net figure is filtered, to remove noise.
In yet another embodiment of the present invention, the candidate touch point acquiring unit 42 is specifically used for：
The pixel point set for being zero to gray value in the current light net figure carries out connected domain detection, by the number comprising pixel
Amount is more than each connected domain of preset third threshold value as a candidate touch point.
It is understood that the work(of each functional unit of infrared touch panel multiple spot identification device 40 in the embodiment of the present invention
It can be implemented according to the method in above method embodiment, specific implementation process is referred to above method embodiment
Associated description, details are not described herein again.
In specific implementation, the privately owned of each candidate touch point is counted based on the light information being blocked got
Light number and publicly-owned light number；First, privately owned light number is greater than or equal to preset by the true touch point judging unit 43
Each candidate touch point of first threshold is determined as true touch point, and updates the publicly-owned light for the candidate touch point that other do not judge
Line number；Then, the non-genuine touch point judging unit 44 judges the candidate touch point not judged, by publicly-owned light number
Each candidate touch point less than preset second threshold is determined as non-genuine touch point, and updates the remaining candidate not judged
The privately owned light number of touch point；Then, when the judging unit 45 judges that the candidate touch point is not determined all, institute is indicated
True touch point judging unit 43 and the non-genuine touch point judging unit 44 are stated successively to the remaining time not judged
Touch point is selected to continue to judge, until the candidate touch point all judges.The embodiment of the present invention is updated using iteration
Mode reject the terrible point in candidate touch point, realization accurately identifies true touch point.
In addition, the present invention also provides a kind of infrared touch panels.
The present invention provides a kind of infrared touch panel, including touch screen and above-mentioned infrared touch panel multiple spot identification device
40。
Infrared touch screen multi-point recognition method, device and infrared touch panel provided in an embodiment of the present invention, have has as follows
Beneficial effect：The privately owned light number of each candidate touch point and publicly-owned light are counted based on the light information being blocked got
Number；First, each candidate touch point for privately owned light number being greater than or equal to preset first threshold is determined as true touch point,
And update the publicly-owned light number for the candidate touch point that other do not judge；Then, the candidate touch point not judged is judged, it will
Publicly-owned light number is determined as non-genuine touch point less than each candidate touch point of preset second threshold, and update it is remaining not
The privately owned light number of the candidate touch point of judgement；Then, remaining do not judged to described successively according to above-mentioned two decision condition
Candidate touch point continue to judge, until the candidate touch point all judges.The embodiment of the present invention uses iteration
Newer mode rejects the terrible point in candidate touch point, and realization accurately identifies true touch point.
It is above disclosed to be only a preferred embodiment of the present invention, the power of the present invention cannot be limited with this certainly
Sharp range, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and is weighed according to the present invention
Equivalent variations made by profit requirement, still belong to the scope covered by the invention.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer read/write memory medium
In, the program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Claims (9)
1. a kind of infrared touch screen multi-point recognition method, which is characterized in that include the following steps：
S11, the light information being blocked between infrared transmitting tube and infrared receiving tube is obtained, it is raw on the basis of bias light net figure
At current light net figure；Wherein, the bias light net figure is infrared transmitting tube before touch-control based on the infrared touch panel and infrared
All light informations between reception pipe and the gray-scale map generated；The gray value of each pixel of the gray-scale map is to pass through
The quantity of the light of the pixel；
S12, the pixel point set for being zero to gray value in the current light net figure carry out connected domain detection, by each detected
Connected domain is as a candidate touch point；
S13, each candidate touch point that privately owned light number is greater than or equal to preset first threshold are determined as true touch point,
And other the candidate touch points not judged for successively being passed through each publicly-owned light of each true touch point is publicly-owned
Light number does the operation that subtracts 1；Wherein, the privately owned light number of each candidate touch point is to be hidden merely through the candidate touch point
The quantity of the light of gear；The publicly-owned light number of each candidate touch point be by the candidate touch point and other at least one
The quantity for the light of a candidate touch point being blocked；
S14, the candidate touch point not judged is judged, publicly-owned light number is less than to each candidate of preset second threshold
Touch point is determined as non-genuine touch point, and finds out non-real merely through this in the publicly-owned light of each non-genuine touch point
The specific publicly-owned light of real touch point and another candidate touch point not judged is passed through each specific publicly-owned light
The privately owned light number for the candidate touch point not judged crossed is done plus 1 operation；
S15, it returns to step S13 and continues to judge the candidate touch point not judged, until the candidate touch point is complete
Until portion judges.
2. infrared touch screen multi-point recognition method as described in claim 1, which is characterized in that the step S11 is specifically included：
Obtain the light information being blocked between the infrared transmitting tube and infrared receiving tube of the infrared touch panel after touch-control；
On the basis of the bias light net figure, the gray value for the pixel that the light that each is blocked is passed through is subtracted 1,
Obtain the current light net figure.
3. infrared touch screen multi-point recognition method as described in claim 1, which is characterized in that the step S12 is specially：
The pixel point set for being zero to gray value in the current light net figure carries out connected domain detection, and the quantity comprising pixel is big
In preset third threshold value each connected domain as a candidate touch point.
4. infrared touch screen multi-point recognition method as described in any one of claims 1 to 3, which is characterized in that the step S12
Before, further include：
S12 ', the current light net figure is filtered, to remove noise.
5. a kind of infrared touch panel multiple spot identification device, which is characterized in that including：
Current light net figure generation unit, for obtaining the light information being blocked between infrared transmitting tube and infrared receiving tube,
Current light net figure is generated on the basis of bias light net figure；Wherein, the bias light net figure is that the infrared touch is based on before touch-control
All light informations between the infrared transmitting tube and infrared receiving tube of screen and the gray-scale map generated；Each of the gray-scale map
The gray value of pixel is the quantity by the light of the pixel；
Candidate touch point acquiring unit, for the pixel point set progress connected domain inspection for being zero to gray value in the current light net figure
It surveys, using each connected domain detected as a candidate touch point；
True touch point judging unit, each candidate touch for privately owned light number to be greater than or equal to preset first threshold
Point is determined as true touch point, and by each publicly-owned light of each true touch point is passed through, other do not judge successively
The publicly-owned light number of candidate touch point do the operation that subtracts 1；Wherein, the privately owned light number of each candidate touch point be merely through
The quantity for the light of the candidate touch point being blocked；The publicly-owned light number of each candidate touch point is to be touched by the candidate
It touches a little and the quantity for the light of other at least one candidate touch points being blocked；
Non-genuine touch point judging unit, for judging the candidate touch point not judged, by publicly-owned light number less than pre-
If each candidate touch point of second threshold be determined as non-genuine touch point, and find out each non-genuine touch point
It, will be every merely through the specific publicly-owned light of the non-genuine touch point and another candidate touch point not judged in publicly-owned light
The privately owned light number for the candidate touch point not judged that the one specific publicly-owned light is passed through is done plus 1 operation；
Judging unit, for when judging that the candidate touch point is not determined all, indicating that the true touch point judgement is single
Member continues to judge to the candidate touch point not judged.
6. infrared touch panel multiple spot identification device as claimed in claim 5, which is characterized in that the current light net figure generates single
Member specifically includes：
Acquisition of information subelement, the quilt between infrared transmitting tube and infrared receiving tube for obtaining the infrared touch panel after touch-control
The light information blocked；
Current light net figure obtains subelement, the light institute on the basis of the bias light net figure, each to be blocked
The gray value of the pixel of process subtracts 1, obtains the current light net figure.
7. infrared touch panel multiple spot identification device as claimed in claim 5, which is characterized in that the candidate touch point obtains single
Member is specifically used for：
The pixel point set for being zero to gray value in the current light net figure carries out connected domain detection, and the quantity comprising pixel is big
In preset third threshold value each connected domain as a candidate touch point.
8. such as claim 5 to 7 any one of them infrared touch panel multiple spot identification device, which is characterized in that described infrared tactile
Touching screen multiple spot identification device further includes：
Image processing unit, after being generated in the current light net figure, before detecting connected domain, to the current light net figure
It is filtered, to remove noise.
9. a kind of infrared touch panel, which is characterized in that including touching box and as claim 5 to 8 any one of them is infrared
Touch screen multiple spot identification device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106020566A (en) * | 2016-05-05 | 2016-10-12 | 广州华欣电子科技有限公司 | Scanning method and device for infrared touch screen |
| CN108415655B (en) * | 2018-02-08 | 2020-10-23 | 广州华欣电子科技有限公司 | Touch data processing method and device, all-in-one machine and storage medium |
| CN110794994A (en) * | 2019-09-27 | 2020-02-14 | 深圳市天英联合教育股份有限公司 | Method and device for determining real contact |
| CN112214135B (en) * | 2020-09-02 | 2022-04-26 | 安徽鸿程光电有限公司 | Multi-touch identification method, device and equipment for infrared touch screen |
| CN112068737B (en) * | 2020-09-03 | 2024-02-20 | 广州华欣电子科技有限公司 | Infrared touch screen signal conditioning circuit and method |
| CN116107450A (en) * | 2022-12-02 | 2023-05-12 | 深圳市鸿合创新信息技术有限责任公司 | Touch point identification method and device of infrared touch screen and infrared touch screen |
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| CN103677441A (en) * | 2012-09-18 | 2014-03-26 | 北京汇冠新技术股份有限公司 | Infrared multipoint identification method, infrared multipoint identification device and infrared touch screen |
| CN103902105A (en) * | 2012-12-28 | 2014-07-02 | 北京汇冠新技术股份有限公司 | Touch recognition method and touch recognition system for infrared touch screen |
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