Anti-jitter rapid convergence method for touch screen
A fast convergence, touch screen technology, applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve problems such as inaccurate clicks, boundary drift curves, uneven changes, etc., and achieve high control accuracy and algorithm Simple, Accuracy-Enhancing Effects
Inactive Publication Date: 2010-09-08
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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[0003] However, neither capacitive nor resistive touch screens can achieve reliable stability and ideal linearity in terms of physical characteristics, and are prone to inaccurate clicks, boundary drift, and uneven curve changes. Therefore, it is necessary to use anti-shake , linearization, and rapid convergence of the curve to calibrate to accurately complete the positioning action
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[0019] Reference figure 1 , The principle block diagram of the method realized by the present invention is as figure 1 As shown, figure 1 It is composed of average filter processing, linearization processing, threshold filter processing, moving state judgment, median filter processing, and cross-border filter processing. The method implemented by the present invention is implemented by the embedded terminal device using the Linux operating system. The embedded terminal device includes a touch screen and a timer. The specific steps are as follows:
[0020] 1. The average filter processing in the method of the present invention mainly completes the average processing of sampled data. The original sampled data samples[n] will be obtained from the touch screen, and the sampled data samples[n] will be averaged filtered. Sampling data is calculated with formula 1 arithmetic average value;
[0021] Y = 1 N X i = 1 N Xi Formula 1
[0022] 2. The linearizatio...
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The invention discloses an anti-jitter rapid convergence method for a touch screen, and relates to the anti-jitter rapid convergence method for the touch screen in the field of the control of an embedded system. The method is particularly suitable to be realized by an embedded terminal device through a Linux operation system. The anti-jitter processing method is performed in different states through the steps of data sampling, average filtering, linear processing, threshold filtering process and the like; and the data after the anti-jitter processing achieves an ideal calibration effect through median filtering and out-of-bound filtering. The method has the advantages of simple algorithm, stable performance, high control precision and the like and can be widely applied to the field of industrial control and the embedded mobile and handheld terminal devices.
Description
Technical field [0001] The invention relates to a fast convergence method for preventing jitter of touch screens in the field of embedded system (Embedded System) control, and is particularly suitable for the design of touch screens of embedded terminal devices. Background technique [0002] As an input device used by an embedded terminal, touch screen is simple to operate, does not occupy additional space, has high reliability, low cost, good light transmission effect, high resolution and high-speed transmission response, so it is widely used in industrial control fields And use on embedded terminal equipment. [0003] However, neither capacitive or resistive touch screens can achieve reliable stability and ideal linearity in physical characteristics, and are prone to inaccurate clicks, boundary drift, and uneven curve changes. Therefore, it is necessary to adopt anti-jitter , Linearization, and rapid convergence of the curve for calibration to accurately complete the positioning...
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IPC IPC(8): G06F3/041
Inventor 张华亮颜建平酒乐程延沛
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP