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Novel coordinate calculating algorithm based in infrared multi-point 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: 2013-12-25
HEFEI UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

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

Method used

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  • Novel coordinate calculating algorithm based in infrared multi-point touch
  • Novel coordinate calculating algorithm based in infrared multi-point touch
  • Novel coordinate calculating algorithm based in infrared multi-point touch

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Embodiment Construction

[0021] A new algorithm 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 When multiple touch points appear, first decode the coded signal scanned by multi-line scanning, store it according to the direction, and detect the connected domain for each direction. The selection of the connected domain is arbitrary, as shown in Figure 1(a) It shows that 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. The area is compared with the original area. If the area to be compared coincides with the original area, as shown in Figure 2(a), add 1 to the flag bit of the...

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Abstract

The invention discloses a novel coordinate calculating algorithm based in infrared multi-point touch. The algorithm includes: decoding a scanned signal, storing directionally, performing communication domain detection on each direction, selecting two communication domains in different directions to calculate a series of zone boundary values, using the zone boundary values as the original zones, comparing the zone boundary values obtained by calculating all communication domains in different directions with the original zones, if certain relation is satisfied, adding 1 to the zone bit of the original zones, allowing for coordinate value accumulation, judging whether the point zone is real or not according to zone bit size, if so, calculating barycentric coordinate, namely the barycentric coordinate of a touch point, of the zone according to the coordinate value accumulation. By the algorithm, coordinate 'ghost points' in multipoint touch can be gotten rid of, and high calculation precision is achieved.

Description

technical field [0001] The invention relates to the field of infrared touch screens, in particular to a new algorithm 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 appl...

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Application Information

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Patent Type & Authority Applications(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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