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A method of calculating coordinates based on infrared multi-touch

A multi-touch, coordinate calculation technology, applied in the input/output process of calculation, data processing, instruments, etc., can solve problems such as insufficient memory, and achieve the effect of high calculation accuracy

Inactive Publication Date: 2016-08-10
HEFEI UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for quickly calculating coordinates by infrared multi-touch to solve the problem of insufficient memory in large-size infrared touch screens in the prior art

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  • A method of calculating coordinates based on infrared multi-touch
  • A method of calculating coordinates based on infrared multi-touch
  • A method of calculating coordinates based on infrared multi-touch

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Embodiment Construction

[0021] A method for calculating coordinates based on infrared multi-touch. In multi-touch, if the touch point is scanned by multi-line scanning, a large number of coded signals will be obtained after scanning for one week. When the touch panel is working, if there is When multiple touch points appear, the coded signal scanned by multi-line scanning method is first decoded, stored according to the direction, and the connected domain is detected for each direction. The selection of the connected domain is arbitrary, as shown in Figure 1(a) , the lower touch panel has two connected domains, the right touch panel has one connected domain, and the intersecting area in the middle is the original area. In arbitrarily selecting a different direction, calculate all the intersecting areas in this direction as the area to be compared, and the area to be compared Compare with the original area. If the area to be compared coincides with the original area, as shown in Figure 2(a), add 1 to ...

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Abstract

The invention discloses a new algorithm for quickly calculating coordinates based on infrared multi-touch. Firstly, the scanned signals are decoded, stored according to directions, connected domains are detected for each direction, and connected domains in two different directions are selected to be calculated. A series of area boundary values, which are used as the original area, and then compare the area boundary values ​​​​calculated by all other connected domains in different directions with the original area, and if a certain relationship is satisfied, add 1 to the flag of the original area , the coordinates are accumulated, and finally, according to the size of the flag, it is judged whether the area of ​​the point is a real area, and if it is true, the coordinates of the center of mass of the area are obtained from the accumulated coordinates of the area, which is the coordinates of the center of mass of the touch point. The invention effectively solves the problem of eliminating coordinate "ghost points" in multi-point touch, and has high calculation accuracy.

Description

technical field [0001] The invention relates to the field of infrared touch screens, in particular to a method for calculating coordinates based on infrared multi-touch. Background technique [0002] With the development of science and technology, touch screens are also developing from traditional single-point touch to multi-touch. Most of the multi-point touch screens that appear at present are capacitive touch screens and computer vision-based. This type of touch screen has high cost and low anti-interference. weak, long life and other shortcomings. The infrared touch screen not only overcomes the above shortcomings, but also has the advantages of convenient installation, long service life, and high light transmission, especially in large-scale applications. Most of the existing large-size infrared touch screens are based on infrared tubes, and the position of the touch point is judged according to the blocking of the optical path. However, in large-scale applications, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042
Inventor 胡跃辉李小哲吕国强刘志民于芳芳
Owner HEFEI UNIV OF TECH
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