CN101639896A - Data filtering and smoothing method applied to touch screen - Google Patents
Data filtering and smoothing method applied to touch screen Download PDFInfo
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Abstract
The invention discloses a data filtering and smoothing method applied to a touch screen, comprising the following steps: establishing stable data sampled when touching, screening effective data and caching; filtering exceptional data sampled when touching; and performing smoothing treatment to data converted to display a coordinate point when sweeping. When the touch screen is applied to various mobile phone platforms, ADC data sampling is carried out on the clicking point for clicking the touch screen, and the sampled data is subject to necessary data filtering and smoothing before being usedfor specific software algorithm relevantly matched with the display zone on the display screen so as to eliminate the problems of clicking abnormality, untidy writing, discontinuous writing and the like. The invention provides the method for filtering and smoothing the data, ensures that the touch point and the display zone are accurately associated and matched, avoids the phenomena of inaccurateclicking, misoperation or inconvenient use and the like.
Description
Technical field
The invention belongs to the mobile communication technology field, be specifically related to a kind of data filter of touch-screen and level and smooth method of being applied to.
Background technology
Under the environment of the continuous development of personal mobile communication technology, mobile phone is increasing to people's effect now, and that the alternating interface between man and computer of mobile phone is also done is more and more abundanter, the more and more hommization that the control operation mode is also done.Specific to in the input of the mobile phone control, now general control input mode be except button be exactly the screen touch mode.The input mode of screen touch has almost become now the standard configuration of mobile phone, and people also are liking very for this convenient, flexible input mode.The input mode of screen touch, inevitably can run into the whether accurately problem of associated match of a touch point and viewing area, clicking point and viewing area can accurately be mapped, inaccurate, maloperation will occur clicking or use inconvenient or the like problem, and one of them of these all kinds of problems important induce factor, be exactly to the ADC sampled data that touches clicking point filter and smoothing processing on incorrect, so how these data are filtered and smoothly, are one and are solving important step on the touch-screen result of use.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of data filter of touch-screen and level and smooth method of being applied to, the sampled data filtering screening and the data smoothing of line that are divided into are a little handled, in the sampled data filtering screening of its mid point, on the different time points according to touch data sampling and processing, the abnormal data that is divided into sampling when touch is started to write filters, and stablizes data screening and valid data caching process; Data in touching the data use of stable back are screened again; Data exception when touching the first stroke of a Chinese character is handled; Also have in metal marker and smoothly go abnormity point to handle to the data that are converted to displaing coordinate point, it is unusual to eliminate click, writes to occur writing quickly problems such as disconnected pen.
For reaching above purpose, the invention provides a kind of data filter of touch-screen and level and smooth method of being applied to, it may further comprise the steps:
The stable data of sampling are set up and valid data screening and buffer memory when (1) touching:
Start sampling TIMER, in the Interrupt Process function of sampling TIMER, the ADC sampling is carried out in the touch point, just begun the ADC sampling parameter that obtains, can't directly send into buffer area and be used for follow-up task detection use, before this, must filter through abnormal data, and the prerequisite that abnormal data filters is the incipient stability data that obtain the current touch point of a more stable representative state.In order to obtain this incipient stability data, in just beginning one section more stable continuous sampled data, use data filter to filter out incipient stability data, wherein, based on removing to shake the stable gradually of back device, and sampling ADC module stable working, think and tend towards stability near the data the 20ms that continuous three sampled datas of getting current slot are sent into and filtered out initial stable data (temp.x in the data filter at the back data sampling that begins to sample; Temp.y).The foundation of filtrator, the foundation of filtrator is based on so prerequisite: in the sampling of continuous three points, wherein, expending time in is 6ms, and the time of 6ms with respect to touch action (no matter clicking or paddling), the time is very short, so think and remain same point, (sample1, sample2 sample3) are exactly three sampled result of same touch point to the data of described continuous three samplings.Under this prerequisite, filtrator is separated into X-axis parameter and Y-axis parameter with these three sampling parameters in calculating and filtering, and is example with the X-axis parameter, and it is as follows to obtain difference respectively between three supplemental characteristics:
abs(sample1.x-sample2.x)；
abs(sample2.x-sample3.x)；
abs(sample1.x-sample3.x)/2；
Wherein, spacing difference owing to point before and after considering in the paddling between sample1.x and sampel3.x compensates, so in the processing that again spacing reduced by half, calculate the minimum value of difference between parameter, (such as sample1.x, mean value sample2.x) is as the final valid data of current touch point with two parameters of the correspondence of this minimal difference.
The abnormal data of sampling filters when (2) touching:
In sampling Interrupt Process function, at first get access to when time sampling parameter value through the function that calls the ADC module; This sampled value is compared the difference between drawing with previous effective value.And difference hereto, we have set two regional extents: one is effective range (0＜difference＜valid_limit), one is critical range (valid_limit＜difference＜invalid_limit), when difference in effective range, current sampled value is effective, the touch point is non-abnormity point, advances to touch the sampling parameter buffer memory in the data buffer area of handling; Be positioned at critical range and work as difference, illustrating that current sampled data has slightly departs from, but can use the correction of last efficiently sampling value, so this sampled value and previous effective sampled value are averaged processing, the result after the processing is saved in the valid data buffer area; And if the difference size outside critical range, it is unusual that so current sampled value just is considered to, and can only discard, and waits for next sampled data;
(3) in the metal marker data that are converted to displaing coordinate point are carried out smoothing processing:
The parameter of the touch point of the sudden change that occurs in the paddling process is handled, according to the several touch point, front and the parameter of current touch point, current touch point parameter is carried out the processing of variable weight, make it to meet and do not influence simultaneously the direction of motion of its actual representative with the track trend of paddling.Concrete computing is followed following formula and is carried out: prerequisite, definition H2[n], H1[n], H0[n] and, CURR[n] representing the computing effective value of current data respectively, the touch point parameter of current two transient state values and current input, n represents the parameter current sequence number.Wherein, the processing computing of current computing effective value is: H2[n]=(H2[n-1]+H1[n-1]+H0[n-1]+CURR[n])/4;
Wherein,
H2[n-1]＝(H2[n-2]+H1[n-2]+H0[n-2]+CURR[n-1])/4；
H1[n-1]＝(H1[n-2]+H0[n-2]+CURR[n-1]+CURR[n-1])/4；
H0[n-1]＝(H0[n-2]+CURR[n-1])/2；
The application parameter of current touch point is by the parameter cum rights computing of touch point that constituted the paddling track and current touch point in the past thus.And the application parameter that this generates also will be included in the computing of next touch point application parameter
A kind of data filter of touch-screen and level and smooth method of being applied to of the present invention, data are filtered and smoothly by a series of processing, eliminate and click unusually, write and occur writing quickly, problems such as disconnected pen, make the accurate associated match in touch point and viewing area, avoid occur clicking inaccurate, maloperation or use inconvenient or the like phenomenon.
Description of drawings
Fig. 1 is that the present invention is applied to the data filter of touch-screen and contact screen information processing and the filtration and the level and smooth main control process flow of level and smooth method.
Fig. 2 is that the present invention is applied to the treatment scheme that sampled data in the sampling Interrupt Process of the data filter of touch-screen and level and smooth method is filtered abnormity point and obtained actual parameter.
Fig. 3 is that the present invention is applied to the data filter of touch-screen and the touch-screen sampled data of level and smooth method is filtered the filter interior flow process of using.
Embodiment
The invention will be further elaborated below in conjunction with accompanying drawing.
As shown in Figure 1 to Figure 3, the invention provides a kind of data filter of touch-screen and level and smooth method of being applied to, it may further comprise the steps:
The stable data of sampling are set up and valid data screening and buffer memory when (1) touching;
The abnormal data of sampling filters when (2) touching;
(3) in the metal marker data that are converted to displaing coordinate point are carried out smoothing processing.
Successively each step is explained in detail below.
The stable data of sampling are set up and valid data screening and buffer memory when (1) touching
In the beginning moment of touch action (starting to write the primary stage), owing to rigidly connect and touch, device state is in and changes in the stable process, the data that sample this time can accurately not expressed the touch point position state, so all need this time one to wait for the stable time of device state, be used to remove this device shake, wherein, the described empirical value time of removing shake time use 30ms.After going dither process, begin to start sampling TIMER, in the Interrupt Process function of sampling TIMER, the ADC sampling is carried out in the touch point.Just begun the ADC sampling parameter that obtains, can't directly send into buffer area and be used for follow-up task detection use, before this, must filter through abnormal data, and the prerequisite that abnormal data filters is the incipient stability data that obtain the current touch point of a more stable representative state.In order to obtain this incipient stability data, the operation parameter filtrator filters out incipient stability data in just beginning one section more stable continuous sampled data, wherein, based on removing to shake the stable gradually of back device, and sampling ADC module stable working, think that data sampling tends towards stability near the data the 20ms beginning to sample afterwards.Continuous three sampled datas of getting current slot are sent into and are filtered out initial stable data (temp.x in the data filter; Temp.y).The foundation of filtrator, the foundation of filtrator are based on so prerequisite: in the sampling of continuous three points, wherein, expending time in is 6ms, and the time of 6ms with respect to touch action (no matter clicking or paddling), the time is very short, so think and remain same point.(sample1, sample2 sample3) are exactly three sampled result of same touch point to the data of described continuous three samplings.Under this prerequisite, filtrator is separated into X-axis parameter and Y-axis parameter with these three sampling parameters in filtering, and is example with the X-axis parameter, and it is as follows to obtain difference respectively between three supplemental characteristics:
abs(sample1.x-sample2.x)；
abs(sample2.x-sample3.x)；
abs(sample1.x-sample3.x)/2；
Wherein, the spacing difference owing to point before and after considering in the paddling between sample1.x and sampel3.x compensates, so in the processing that again spacing reduced by half.Calculate the minimum value of difference between parameter, (such as sample1.x, mean value sample2.x) is as the final valid data of current touch point with two parameters of the correspondence of this minimal difference.
The abnormal data of sampling filters when (2) touching
It is mainly together finished in the Interrupt Process function of sampling.In sampling Interrupt Process function, at first get access to when time sampling parameter value through the function that calls the ADC module; This sampled value is compared the difference between drawing with previous effective value.And difference hereto, we have set two regional extents: one is effective range (0＜difference＜valid_limit), one is critical range (valid_limit＜difference＜invalid_limit), when difference in effective range, current sampled value is effective, the touch point is non-abnormity point, advances to touch the sampling parameter buffer memory in the data buffer area of handling; Be positioned at critical range and work as difference, illustrating that current sampled data has slightly departs from, but can use the correction of last efficiently sampling value, so this sampled value and previous effective sampled value are averaged processing, the result after the processing is saved in the valid data buffer area; And if the difference size outside critical range, it is unusual that so current sampled value just is considered to, and can only discard, and waits for next sampled data;
(3) in the metal marker data that are converted to displaing coordinate point are carried out smoothing processing
In front in two steps, though carried out the filtration and the screening of data since touch the difference of sheet material and top data processing not exclusively, parameter and the numerical value on the actual physics in the continuous sampled point always have certain difference.And this species diversity performance more obvious at paddling and when showing the paddling track will exert an influence to carry out write operation on touch-screen like this.In order to address this problem the smoothing processing the when actual parameter by sampling is carried out paddling through the converted displaing coordinate parameter of location algorithm.And the ultimate principle of the smoothing processing of these data is based on continuity that actual physical location in the paddling process changes and mutability not.The parameter of the touch point of the sudden change that will occur in the paddling process is handled, according to the several touch point, front and the parameter of current touch point, current touch point parameter is carried out the processing of variable weight, make it to want to meet and do not influence simultaneously the direction of motion of its actual representative with the track of paddling trend.Concrete computing is followed following formula and is carried out: prerequisite, definition H2[n], H1[n], H0[n] and, CURR[n] representing the computing effective value of current data respectively, the touch point parameter of current two transient state values and current input, n represents the parameter current sequence number.Wherein, the processing computing of current computing effective value is:
H2[n]＝(H2[n-1]+H1[n-1]+H0[n-1]+CURR[n])/4；
Wherein,
H2[n-1]＝(H2[n-2]+H1[n-2]+H0[n-2]+CURR[n-1])/4；
H1[n-1]＝(H1[n-2]+H0[n-2]+CURR[n-1]+CURR[n-1])/4；
H0[n-1]＝(H0[n-2]+CURR[n-1])/2；
The application parameter of current touch point is by the parameter cum rights computing of touch point that constituted the paddling track and current touch point in the past thus.And the application parameter that this generates also will be included in the computing of next touch point application parameter, so circulation is gone down, current coordinate data was got up with different weighted associations with former coordinate points, finally obtain the coordinate data after the smoothing processing of accompany movement track trend.
By the foregoing description, purpose of the present invention is by in full force and effect having reached.The personage who is familiar with this skill should be understood that the content that the present invention includes but be not limited to describe in the top embodiment.Any modification that does not depart from function of the present invention and structural principle all will be included in the scope of claims.
Claims (7)
1. one kind is applied to the data filter of touch-screen and level and smooth method, and it may further comprise the steps:
Start sampling TIMER, in the Interrupt Process function of sampling TIMER, the ADC sampling is carried out in the touch point;
Obtain the sampled data of the current touch point of representative state, filter out initial stable data by data filter;
In the metal marker data that are converted to displaing coordinate point are carried out smoothing processing:
The parameter of the touch point of the sudden change that will occur in the paddling process is handled, according to the touch point of sampling before and the parameter of current touch point, current touch point parameter is carried out the processing of variable weight, make it to meet and do not influence simultaneously the direction of motion of its actual representative with the track trend of paddling, concrete computing is followed following formula and is carried out: definition H2[n], H1[n], H0[n], CURR[n] represent the computing effective value of current data respectively, the touch point parameter of current two transient state values and current input, n represents the parameter current sequence number, wherein, the processing computing of current computing effective value is: H2[n]=(H2[n-1]+H1[n-1]+H0[n-1]+CURR[n])/4;
Wherein,
H2[n-1]＝(H2[n-2]+H1[n-2]+H0[n-2]+CURR[n-1])/4；
H1[n-1]＝(H1[n-2]+H0[n-2]+CURR[n-1]+CURR[n-1])/4；
H0[n-1]＝(H0[n-2]+CURR[n-1])/2；
The application parameter of current touch point is by the parameter cum rights computing of touch point that constituted the paddling track and current touch point in the past thus, and the application parameter that this generates also will be included in the computing of next touch point application parameter.
2. the data filter of touch-screen and the level and smooth method of being applied to as claimed in claim 1, it is characterized in that, in sampling Interrupt Process function, at first get access to when time sampling parameter value through the function that calls the ADC module, this sampled value is compared with previous effective value, difference between drawing, difference hereto, set two regional extents: one is effective range (0＜difference＜valid_limit), one be critical range (valid_limit＜difference＜invalid_limit), when difference in effective range, current sampled value is effective, the touch point is non-abnormity point, advances to touch the sampling parameter buffer memory in the data buffer area of handling; And be positioned at critical range when difference, and illustrating that current sampled data has slightly departs from, and uses the correction of last efficiently sampling value, so this sampled value and previous effective sampled value are averaged processing, the result after the processing is saved in the valid data buffer area; And if the difference size outside critical range, it is unusual that so current sampled value just is considered to, and can only discard, and waits for next sampled data.
3. the data filter of touch-screen and the level and smooth method of being applied to as claimed in claim 1, it is characterized in that, filter out the flow process of incipient stability data by data filter: continuous three sampled datas of getting current slot are sent into and are filtered out initial stable data (temp.x in the data filter; Temp.y), the foundation of filtrator, the foundation of filtrator is based on so prerequisite: in the sampling of continuous three points, time is very short, with respect to touch action, no matter click or paddling, think to remain same some data (sample1, the sample2 of described continuous three samplings, sample3) be three sampled result of same touch point, under this prerequisite, filtrator is separated into X-axis parameter and Y-axis parameter with these three sampling parameters in filtering, with the X-axis parameter is example, and it is as follows to obtain difference respectively between three supplemental characteristics:
abs(sample1.x-sample2.x)；
abs(sample2.x-sample3.x)；
abs(sample1.x-sample3.x)/2；
Wherein, spacing difference owing to point before and after considering in the paddling between sample1.x and sampel3.x compensates, so with the spacing processing that reduces by half, calculate the minimum value of difference between parameter, with the mean value of two parameters of the correspondence of this minimal difference final valid data as current touch point.
4. the data filter of touch-screen and the level and smooth method of being applied to as claimed in claim 2 is characterized in that, the sampling of continuous three points, and expending time in is 6ms.
5. the data filter of touch-screen and the level and smooth method of being applied to as claimed in claim 1 is characterized in that: the data that filtrator adopts are the data behind the beginning sampled data 20ms.
6. the data filter of touch-screen and the level and smooth method of being applied to as claimed in claim 1 is characterized in that, in the whole course of action of touch action, this task uses the frequency of 333Hz to carrying out the sample collection data when time touch.
7. the data filter of touch-screen and the level and smooth method of being applied to as claimed in claim 1 is characterized in that, after the beginning of touch action, before the startup sampling TIMER, going the shake time of 30ms arranged.
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