CN101498975A

CN101498975A - Digital filtering method for processing flying spot on touch screen

Info

Publication number: CN101498975A
Application number: CNA2008100574689A
Authority: CN
Inventors: 张小生
Original assignee: TECHFAITH INTELLIGENT HANDSET TECHNOLOGY (BEIJING) Co Ltd
Current assignee: TECHFAITH INTELLIGENT HANDSET TECHNOLOGY (BEIJING) Co Ltd
Priority date: 2008-02-02
Filing date: 2008-02-02
Publication date: 2009-08-05

Abstract

The invention discloses a digital filtering method for processing touch screen flying spots. By amplitude limit added with median number, the data collected on the touch screen has digital filtering processing, and the discipline of flying spots of the touch screen is analyzed; there is no flying-spot phenomenon when the pen slides, and there is flying-spot phenomenon just when the pen falls or rises. Moreover, the discipline of flying spots is that X coordinate is mainly flied to O and Y coordinate is mainly flied to around the middle position of the screen. Therefore, the flying spots of X coordinate can be efficiently eliminated by using a limiter; for the Y coordinate, 6 continuous collected data is processed and sorted by using bubble sorting so as to eliminate the maximum value and minimum value, and the 4 values in middle carry out arithmetic mean. Therefore, the spots flied at the middle position of the screen are efficiently eliminated, the sample rate of the touch screen is not reduced, and simultaneously the filtering method is also used for the X coordinate. The method provides the advantages of being capable of efficiently eliminating flying spots having smaller deviation, also having very good inhibitory effect for flying spots having bigger deviation but not reducing the sample rate of the touch screen. There is no flying spot when the user uses the touch screen, touch screen data can be quickly obtained, which is very stable and reliable.

Description

A kind of digital filtering method of handling flying spot on touch screen

Technical field

The present invention relates to field of mobile communication, specifically refer to the handheld device of band touch-screen input.

Background technology

At present a lot of mobile phones use touch-screen to carry out user's input operation, occur the situation of flying spot sometimes, cause maloperation, bring very big inconvenience to the user.A lot of slip-stick artist's data that collection comes up to touch-screen have been carried out Filtering Processing, adopt the method for directly averaging.

The method of directly averaging can only be handled not too serious situation of flying spot, the data that collect are directly done sums on average, but when handling the very big situation of the point collect and actual point deviation, effect is undesirable.

Adopting increases the method for sampling number to multiple averaging, can further reduce error, if but be used for doing the burden that average sampling number too much can increase central processing unit, make to reach the requirement of Microsoft to sampling rate; Sampling number has lacked and can not effectively reduce error.

Summary of the invention

At above-mentioned defective, the invention discloses a kind of digital filtering method of handling flying spot on touch screen, add the median digital filtering method by amplitude limit, the data that collection comes up to touch-screen are carried out the digital filtering processing, thereby obtain stable touch screen data fast.

The present invention discloses a kind of digital filtering method of handling flying spot on touch screen, analyzes by the flying spot rule to touch-screen, and finding does not have the flying spot phenomenon when felt pen slides, and has only felt pen to fall or the flying spot phenomenon is arranged when lifting.And discipline of flying spots is that the X coordinate mainly is to fly to 0, and the Y coordinate mainly is to fly to about the screen centre position.

At the X coordinate of flying spot mainly is 0 rule, has adopted limiter.In program, at first the X coordinate figure that collects is judged, if 0, then give up this point and continue image data till being not 0, by adopting this limiter, can effectively remove the flying spot on the X coordinate.

Main rule about the screen centre position at the Y coordinate of flying spot has adopted the middle position value filtering method.Continuous 6 image data are handled, adopted the bubbling method to sort, remove minimum value and maximal value, middle 4 values are done sums on average.The method can effectively reduce error, the point that flies to the screen centre position is effectively removed, and do not reduced the sampling rate of touch-screen, simultaneously the X coordinate is also adopted this filtering method.

This filtering method can effectively be removed the less flying spot of deviation, and the flying spot bigger to deviation also has the good restraining effect, and does not reduce the sampling rate of touch-screen.Do not have flying spot when the user uses touch-screen and occur, highly stable reliable.

Description of drawings

Fig. 1 amplitude limit adds the processing flow chart of middle position value filtering method.

Embodiment

Be described further below in conjunction with Fig. 1.

Felt pen with the screen contact 101 after, touch-screen begins image data 102.Central processing unit judges 103 to gathering the data of coming up.If the X coordinate figure is zero, think that this point data is invalid, image data is non-vanishing up to the X coordinate again.Then to continuous acquisition to the XY coordinate figure carry out bubble sort 104 respectively, remove X coordinate, Y coordinate maximal value and minimum value 105.It is average 106 then 4 values of centre to be done sums, and obtains accurate sampling number according to 107.After related data passes to operating system, judge whether felt pen lifts 108,, finish image data 109 if lift; If do not lift, then carry out the gatherer process of next data, lift up to felt pen.

Such scheme example of the present invention only is used for illustrative purposes, is not in order to limit the present invention.Those skilled in the art can make the various modifications that are equal under the premise of not departing from the present invention, and these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. digital filtering method of handling flying spot on touch screen is characterized in that: add the median numeral by amplitude limit, the data that collection comes up to touch-screen are carried out digital filtering and are handled, thereby obtain stable touch screen data fast.

2. a kind of digital filtering method of handling flying spot on touch screen according to claim 1 is characterized in that: at the X coordinate of flying spot mainly is 0 rule, has adopted limiter.

3. according to claim 1,2 described a kind of digital filtering methods of handling flying spot on touch screen is characterized in that: by adopting this limiter, at first the X coordinate figure that collects is judged in program, if 0, then give up this point and continue image data till being not 0.

4. a kind of digital filtering method of handling flying spot on touch screen according to claim 1 is characterized in that: at the Y coordinate of flying spot, because the middle position value filtering method is adopted in its main position about the screen centre.

5. according to claim 1,4 described a kind of digital filtering methods of handling flying spot on touch screen, it is characterized in that: it is by the method for middle position value filtering, continuous 6 image data are handled, adopt the bubbling method to sort, remove minimum value and maximal value, middle 4 values are done sums on average, simultaneously the X coordinate is also adopted this filtering method.