Digital filtering method for processing flying spot on touch screen

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

technical field [0001] The invention relates to the field of mobile communication, in particular to a hand-held device with touch screen input. Background technique [0002] At present, many mobile phones use touch screens for user input operations, and sometimes flying points may occur, causing misoperation and bringing great inconvenience to users. Many engineers filter the data collected by the touch screen, and use the method of directly taking the average value. [0003] The method of directly taking the average value can only deal with the situation where the flying points are not too serious, and directly calculates the arithmetic mean of the collected data, but the effect is not ideal when dealing with the case where the collected points deviate greatly from the actual points. [0004] Using the method of increasing the number of sampling times to average multiple times can further reduce the error, but if the number of sampling times used for averaging is too large...

AI Technical Summary

Problems solved by technology

[0003] The method of directly taking the average value can only deal with the situation where the flying points are not too serious, and directly calculates the arithmetic mean of the collected data, but the effect is not ideal when dealing with the situation where the collected points deviate greatly from the actual points

[0004] Using the method of increasing the number of sampling times to average multiple times can further reduce the error, but if the number of sampling times used for averaging is too large, it will increase the burden on the central processing unit, making it impossible to meet Microsoft's requirements for sampling rate; can not effectively reduce the error

Images