A two-stage filter processing method for real-time tracking and de-jittering of touch screen coordinates

Abstract

The invention relates to the technical field of touch chip design and application, in particular to a two-stage filtering processing method for real-time following and debouncing of coordinates of a touch screen, and provides a two-stage filtering processing method which comprises the following steps: in the first stage, through pre-judgment filtering, debouncing and acceleration in differential can be realized, but overshoot can be caused; in the second stage, speed mean filtering is utilized, a good jitter removing effect is achieved, and real-time coordinate processing of touch system calculation is achieved through combination of the speed mean filtering and the jitter removing effect, so that the real-time performance and the linearity of coordinates are effectively improved. By usingthe algorithm, in touch application, an ideal effect can be achieved regardless of click, slow stroke and fast stroke, and high creativity is achieved.

Description

technical field [0001] The invention relates to the technical field of touch chip design and application, in particular to a two-stage filter processing method for real-time tracking and de-jittering of touch screen coordinates. Background technique [0002] With the development of touch technology, the usage rate of touch screens in various electronic devices is getting higher and higher. Consumer electronic products, such as mobile phones and tablets, have increasingly strong performance requirements for entertainment applications. The focus of touch screen human-computer interaction is generally reflected in the real-time and stability of multi-finger touch coordinates. [0003] The touch system calculates the touch coordinates by sampling the capacitance on the screen. Due to design, cost, application environment and other reasons, the capacitance value sampled by the touch system cannot be 100% accurate in real time, which leads to some deviations in the calculated co...

AI Technical Summary

Problems solved by technology

Due to design, cost, application environment and other reasons, the capacitance value sampled by the touch system cannot be 100% accurate in real time, which leads to some deviations in the calculated coordinates

Generally, the jitter processing of the coordinates is the mean value filter, through the data of the current and the previous few shots, the filter processing is performed at a certain ratio, similar to this kind of filter can not take into account the linearity and followability

Often the linearity is adjusted well, but the fast following is not ideal, and the following performance is improved, but the linearity becomes worse

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