CN106502460B - A kind of recognition methods of capacitance touching control track noise type - Google Patents
A kind of recognition methods of capacitance touching control track noise type Download PDFInfo
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- CN106502460B CN106502460B CN201610930790.2A CN201610930790A CN106502460B CN 106502460 B CN106502460 B CN 106502460B CN 201610930790 A CN201610930790 A CN 201610930790A CN 106502460 B CN106502460 B CN 106502460B
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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
- 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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Abstract
The invention discloses a kind of recognition methods of capacitance touching control track noise type, comprising the following steps: S1: being parallel to capacitance plate and carries out a straight line touch-control on one side, takes multiple scan to capacitance plate, obtain capacitance touching control track data；S2: the capacitance touching control track data is handled using centroid method, the position coordinates of each touch point in capacitance touching control track is obtained, is sequentially connected each touch point and obtains complete capacitance touching control track；S3: it is real trace and noise track by the capacitance touching control decomposing trajectories, the noise track is solved using signal decomposition method；S4: according to Mathematical Statistic Analysis Method, determining the noise type of the noise track, and technical solution of the present invention can be effectively separated the noise track of capacitance touching control track, realizes the analysis and identification of the noise type of capacitance touching control track.
Description
Technical field
The present invention relates to capacitance touching control trajectory processing fields, more particularly, to a kind of capacitance touching control track noise type
Recognition methods.
Background technique
Currently, capacitive touch screen has become the mainstream selection of human-computer interaction interface, capacitive touch screen is good with its
Touch experience has won the approval of users, but capacitive touch screen is easy to be influenced by equipment internal noise and generates falseness
With mistake response, typical performance be occur during touch control operation touch point in touch trajectory forecasting inaccuracy really and saw
The output of tooth form track, to influence user experience level.With the continuous development of signal processing technology, using hardware handles or
The method of person's software processing carries out signature analysis and filtering processing to noise present in touching signals, exports reliable and stable touching
Control track has become one of the research hotspot of domestic and international academia.The identification of noise type is that planned course is smooth in touch trajectory
The basis of filtering algorithm for the different filtering algorithm of different types of track Noise Design or selects different filtering parameters,
The problem of being brought with the blindness trial in the existing filtering algorithm design of effective solution.Therefore, for preferably design capacitance
A kind of noise filtering algorithm of touch trajectory, it is desirable to provide analysis and identification for capacitance touch screen touch trajectory signal noise
Method.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of recognition methods of capacitance touching control track noise type, with more preferable
The noise filtering algorithm of ground design capacitance touch trajectory.
In order to achieve the above objectives, the present invention adopts the following technical solutions:
A kind of recognition methods of capacitance touching control track noise type, which comprises the following steps:
S1: it is parallel to capacitance plate and carries out a straight line touch-control on one side, capacitance plate is taken multiple scan, capacitance touching control is obtained
Track data；
S2: the capacitance touching control track data is handled using centroid method, obtains each touch point in capacitance touching control track
Position coordinates are sequentially connected each touch point and obtain complete capacitance touching control track；
S3: it is real trace and noise track by the capacitance touching control decomposing trajectories, institute is solved using signal decomposition method
State noise track；
S4: according to Mathematical Statistic Analysis Method, the noise type of the noise track is determined.
Preferably, capacitance plate is taken multiple scan in the step S1, the capacitance touching control track number that scanning obtains every time
It is according to single frames
Wherein, k is scanning times, and m is the number of the driving electrodes of capacitance plate, and n is the number of the induction electrode of capacitance plate.
Multiple capacitance touching control track data single frames groups that Multiple-Scan is obtained become the capacitance touching control track of multiframe
Data.
Preferably, the step S2 includes:
S21: being that rectangular coordinate system is established in the direction x with straight line touch-control direction, so that it is determined that the capacitance touching control track data
The coordinate position of the maximum sampled point of capacitance is in single frames
Pmax(k)=(Pmaxx(k),Pmaxy(k))
Wherein, PmaxxIt (k) is the direction the x coordinate of the maximum sampled point of capacitance, PmaxyIt (k) is the maximum sampling of capacitance
The direction the y coordinate of point；
S22: the capacitance of the maximum sampled point of capacitance is compared with preset threshold value, when the capacitance is greater than
When the threshold value, determine the sampled point for the touch point on capacitance touching control track；
S23: determine that the coordinate of the touch point is maximum with the capacitance in the capacitance touching control track data single frames
Sampled point centered on touch-control influenced zone domain in all sampled points capacitance weighting, the coordinate of the touch point is
P (k)=(Px(k),Py(k))
Wherein, CxyFor the capacitance for the sampled point that coordinate in capacitance touching control track data single frames is (x, y), Ω is touch point
Influence area, Px(k) be sweep time t when touch point direction coordinate, Py(k) be sweep time t when touch point the direction y
Coordinate；
S24: it is sequentially connected the coordinate of each touch point acquired, obtains capacitance touching control track.
Preferably, the step S3 includes:
S31: being real trace and noise track two parts by capacitance touching control decomposing trajectories
P (t)=PD(t)+n(t)
T=kT0
Wherein, t is sweep time, T0For sweep spacing, P (t) is capacitance touching control track, PDIt (t) is real trace, n (t)
For noise track；
S32: real trace of the capacitance plate touch track in the direction y is steady state value Y0, then on the direction y touch trajectory in t
The track at quarter is
Py(t)=Y0+ny(t)
Wherein, ny(t) noise track on the direction real trace y is superimposed upon for t moment.
Then real trace is
Wherein, T is the time span of straight line touch-control.
Then noise track is
Preferably, the step S4 determines the noise type of the noise track using histogram and/or Q-Q figure.
Beneficial effects of the present invention are as follows:
The present invention provides a kind of recognition methods of capacitance touching control track noise type, can be in capacitance plate touch track
Noise track carries out separation and identifies noise type according to mathematical statistics method, with the noise of preferably design capacitance touch trajectory
Filtering algorithm saves capacitance plate noise processed design time and cost, improves design efficiency.
Detailed description of the invention
Fig. 1 shows a kind of flow chart of the recognition methods of capacitance touching control track noise type.
Fig. 2 shows the capacitance touching control tracks that scanning capacitance screen obtains.
Fig. 3 shows decomposing trajectories figure of the capacitance touching control track on the direction x, y.
Fig. 4 shows the separation figure of the noise track of capacitance touching control track.
Fig. 5 shows the noise track histogram of capacitance touching control track.
Fig. 6 shows the noise track Q-Q figure of capacitance touching control track.
Fig. 7 shows the true touch trajectory of capacitance plate of preferred embodiment.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in Figure 1, the invention discloses a kind of recognition methods of capacitance touching control track noise type, including following step
It is rapid:
S1: a straight line touch-control is carried out on capacitance plate, capacitance plate is taken multiple scan, obtains capacitance touching control track number
According to.A straight line touch-control is carried out on capacitance plate by finger, during touch-control, by data acquisition module to capacitance plate
It is timed scanning, the capacitance data of each node of capacitance plate is acquired, judges whether there is touch-control, when touch-control starts, data
After acquisition module judges that touch-control starts, capacitance plate is taken multiple scan, data acquisition module can acquire a m in scanning every time
× n overlaps mutual capacitance matrix array, and the m × n overlaps mutual capacitance matrix array and is
Wherein, k is scanning times, and m is the driving electrodes number of capacitance plate, and n is the induction electrode number of capacitance plate.
Multiple m × n are overlapped mutual capacitance matrix array and are transmitted to as a data frame by the coffret module
Host computer, wherein it is a capacitance touching control track data single frames that each m × n, which overlaps mutual capacitance matrix array, described upper
Machine receives multiple data single frames and forms the capacitance touching control track data of multiframe, and the data are stored as data file
Format.
S2: the capacitance touching control track data is handled using centroid method, obtains each touch point in capacitance touching control track
Position coordinates are sequentially connected each touch point and obtain complete capacitance touching control track:
S21: when handling the touch trajectory data, setting is the rectangular coordinate system in the direction x with straight line touch-control direction, from
And determine that the coordinate position of the maximum sampled point of capacitance in single frames C (k) is
Pmax(k)=(Pmaxx(k),Pmaxy(k))
Wherein, PmaxxIt (k) is the direction the x coordinate of the maximum sampled point of capacitance, PmaxyIt (k) is the maximum sampling of capacitance
The direction the y coordinate of point.
S22: the capacitance of the maximum sampled point of the capacitance is compared with preset threshold value, when the capacitance
When the capacitance of maximum sampled point is greater than the threshold value, determine the maximum sampled point of the capacitance on capacitance touching control track
Touch point.
S23: the coordinate for determining the touch point is in the capacitance touching control track data frame with the maximum sampling of capacitance
The capacitance weighted calculation of all sampled points in touch-control influenced zone domain centered on point obtains, and the coordinate of the touch point is
P (k)=(Px(k),Py(k))
Wherein, CxyFor the capacitance for the sampled point that coordinate in touch trajectory data frame is (x, y), Ω is the influence of touch point
Region, Px(k) be sweep time t when touch point direction coordinate, Py(k) be sweep time t when touch point the direction y coordinate.Touching
The touch point and all mid-side nodes for controlling caused capacitor significant change when the influence area Ω put is this of finger touch are formed
Region, usual region Ω chooses d × d matrix area centered on the touch point, wherein d is preferably 3,5 or 7, more preferably
, d 3.
S24: it is sequentially connected the coordinate of each touch point acquired, obtains capacitance touching control track, as shown in Figure 2.
S3: being real trace and noise track by the capacitance touching control decomposing trajectories, using signal as shown in Figure 3, Figure 4
Decomposition method solves the noise track.The following steps are included:
S31: being real trace and noise track two parts by capacitance touching control decomposing trajectories
P (t)=PD(t)+n(t)
T=kT0
Wherein, t is sweep time, T0For sweep spacing, P (t) is capacitance touching control track, PDIt (t) is real trace, n (t)
For noise track；
S32: real trace of the capacitance plate touch track in the direction y is steady state value Y0, then on the direction y touch trajectory in t
The track at quarter is
Py(t)=Y0+ny(t)
Wherein, ny(t) noise track on the direction real trace y is superimposed upon for t moment.
By the thought of signal decomposition it is found that signal can be decomposed into the combination of DC component and AC compounent, wherein signal
Average value is denoted as the DC component of signal, removes the AC compounent that DC component obtains signal from original signal.Then true rail
Mark is
Wherein, T is the time span of straight line touch-control.
It is hereby achieved that the noise track of the capacitance touching control track is
S4: as shown in Figure 5, Figure 6, according to Mathematical Statistic Analysis Method, the noise type of the noise track is determined.Knowing
Histogram can be used when other noise type and/or Q-Q figure determines the noise type of the noise track.
Histogram can intuitively indicate the frequency distribution of data, and histogram abscissa indicates the value of noise amplitude variable
Equal group may be selected away from ordinate indicates data frequency, the histogram for drawing noise track can be corresponded to, according to histogram in section
Figure may determine that the distribution pattern of noise track.
Whether the distribution that Q-Q figure can identify noise signal is similar to certain type of distribution.By taking normal distribution as an example, it is assumed that
Overall distribution is normal distribution N (μ, σ2), if sample data is similar to normal distribution, data point approximatively exists on Q-Q figure
Near straight line y=σ x+ μ.Therefore, the Q-Q figure of touch trajectory noise track is drawn, if approximatively near straight line, it can
Think noise signal Normal Distribution, is identified as Gaussian noise type.
Below by one group of preferred embodiment, the present invention is described further, as shown in fig. 7, choosing 7 English
Very little capacitance touch screen is acquisition platform, and it is straight to carry out 3 fingers respectively in the long side and short side direction for being parallel to capacitance touch screen
Line touches, and equidirectional finger touch position twice is in the position close to touch-control edge 10mm or so, and in addition a finger touches
Position is in the position of touch screen middle line.The capacitance touching control track of host computer is generated by data acquisition module and data transmission module
Data solve capacitance touching control track using centroid method, the superposition of real trace and noise track are broken down into, to be made an uproar
Soundtrack mark draws the statistic histogram and Q-Q figure of noise track, can analyze to obtain capacitance touch screen noise track symbol from figure
Normal distribution is closed, can be Gaussian noise by the Noise Identification.
In conclusion technical solution of the present invention can be effectively separated the noise track of capacitance touching control track,
It realizes the analysis and identification of the noise type of capacitance touching control track, can be the design and ginseng of capacitance touching control track noise filtering algorithm
Several selections provides reference.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (2)
1. a kind of recognition methods of capacitance touching control track noise type, which comprises the following steps:
S1: it is parallel to capacitance plate and carries out a straight line touch-control on one side, capacitance plate is taken multiple scan, capacitance touching control track is obtained
Data, including:
Capacitance plate is taken multiple scan, the capacitance touching control track data single frames that scanning obtains every time is
Wherein, k is scanning times, and m is the number of the driving electrodes of capacitance plate, and n is the number of the induction electrode of capacitance plate,
Multiple capacitance touching control track data single frames groups that Multiple-Scan is obtained become the capacitance touching control track data of multiframe；
S2: the capacitance touching control track data is handled using centroid method, obtains the position of each touch point in capacitance touching control track
Coordinate is sequentially connected each touch point and obtains complete capacitance touching control track, including:
S21: being that rectangular coordinate system is established in the direction x with straight line touch-control direction, so that it is determined that the capacitance touching control track data single frames
The coordinate position of the middle maximum sampled point of capacitance is
Pmax(k)=(Pmaxx(k),Pmaxy(k))
Wherein, PmaxxIt (k) is the direction the x coordinate of the maximum sampled point of capacitance, PmaxyIt (k) is the y of the maximum sampled point of capacitance
Direction coordinate；
S22: the capacitance of the maximum sampled point of capacitance is compared with preset threshold value, when the capacitance is greater than described
When threshold value, determine the sampled point for the touch point on capacitance touching control track；
S23: the coordinate for determining the touch point is to adopt in the capacitance touching control track data single frames with the capacitance is maximum
The capacitance of all sampled points in touch-control influenced zone domain centered on sampling point weights, and the coordinate of the touch point is
P (k)=(Px(k),Py(k))
Wherein, CxyFor the capacitance for the sampled point that coordinate in capacitance touching control track data single frames is (x, y), Ω is the shadow of touch point
Ring region, Px(k) be sweep time t when touch point the direction x coordinate, Py(k) be sweep time t when touch point the direction y sit
Mark；
S24: it is sequentially connected the coordinate of each touch point acquired, obtains capacitance touching control track；
S3: by the capacitance touching control decomposing trajectories be real trace and noise track, using signal decomposition method solve described in make an uproar
Soundtrack mark, including:
S31: being real trace and noise track two parts by capacitance touching control decomposing trajectories
P (t)=PD(t)+n(t)
T=kT0
Wherein, t is sweep time, T0For sweep spacing, P (t) is capacitance touching control track, PDIt (t) is real trace, n (t) is to make an uproar
Soundtrack mark；
S32: real trace of the capacitance plate touch track in the direction y is steady state value Y0, then rail of the touch trajectory in t moment on the direction y
Mark is
Py(t)=Y0+ny(t)
Wherein, ny(t) noise track on the direction real trace y is superimposed upon for t moment
Then real trace is
Wherein, T is the time span of straight line touch-control
Then noise track is
S4: according to Mathematical Statistic Analysis Method, the noise type of the noise track is determined.
2. the method according to claim 1, wherein the step S4 schemes to determine institute using histogram and/or Q-Q
State the noise type of noise track.
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| CN111435283A (en) * | 2019-01-11 | 2020-07-21 | 敦泰电子有限公司 | Operation intention determining method and device and electronic equipment |
| CN110389684B (en) * | 2019-06-28 | 2021-07-16 | 联想(北京)有限公司 | Touch identification method, touch equipment and display equipment |
Citations (5)
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| CN102096530A (en) * | 2011-01-28 | 2011-06-15 | 广东威创视讯科技股份有限公司 | Multi-touch trajectory tracking method |
| CN102707821A (en) * | 2011-03-28 | 2012-10-03 | 深圳市汇顶科技有限公司 | Method and system for de-noising touch detection device |
| CN102722285A (en) * | 2012-06-08 | 2012-10-10 | 深圳市汇顶科技有限公司 | Method and system for eliminating deformation noise in detection data of touch detection device |
| CN103513811A (en) * | 2012-06-29 | 2014-01-15 | 北京汇冠新技术股份有限公司 | Touch trajectory tracking method |
| US9310943B1 (en) * | 2012-01-17 | 2016-04-12 | Parade Technologies, Ltd. | Multi-stage stylus scanning |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096530A (en) * | 2011-01-28 | 2011-06-15 | 广东威创视讯科技股份有限公司 | Multi-touch trajectory tracking method |
| CN102707821A (en) * | 2011-03-28 | 2012-10-03 | 深圳市汇顶科技有限公司 | Method and system for de-noising touch detection device |
| US9310943B1 (en) * | 2012-01-17 | 2016-04-12 | Parade Technologies, Ltd. | Multi-stage stylus scanning |
| CN102722285A (en) * | 2012-06-08 | 2012-10-10 | 深圳市汇顶科技有限公司 | Method and system for eliminating deformation noise in detection data of touch detection device |
| CN103513811A (en) * | 2012-06-29 | 2014-01-15 | 北京汇冠新技术股份有限公司 | Touch trajectory tracking method |
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