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Coordinate capturing and correcting algorithm of infrared multipoint touch screen

A multi-touch screen and correction algorithm technology, which is applied in the field of coordinate capture and correction algorithm of infrared multi-point touch screen, can solve the problems of large error, slow speed, and insufficient precision, and achieve fast speed, fast response, and high capture accuracy. Effect

Inactive Publication Date: 2014-01-01
HEFEI UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a coordinate capture and correction algorithm of an infrared multi-point touch screen, so as to solve the problems of large error, insufficient precision and slow speed in the process of obtaining coordinates of the infrared touch screen

Method used

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  • Coordinate capturing and correcting algorithm of infrared multipoint touch screen
  • Coordinate capturing and correcting algorithm of infrared multipoint touch screen
  • Coordinate capturing and correcting algorithm of infrared multipoint touch screen

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Embodiment Construction

[0024] An infrared multi-touch screen coordinate capture and correction algorithm, see the attached figure 2 , the steps are as follows:

[0025] (1) Apply the least squares method to obtain the contact coordinates:

[0026] (a) Obtain the start light and stop light of the blocked connected domain, as well as the size of the connected domain; the connected domain is the horizontal or vertical width of the blocked light in the same direction;

[0027] (b) Obtain the equation of the middle straight line of the blocked connected domain to form a system of equations;

[0028] (c) Simplify the system of equations to obtain the form of Ax=b. The so-called least square method is to obtain A T Ax=A T The solution of b, the solution is the least squares solution of the middle line equations of the connected domain;

[0029] (2) After obtaining the coordinates of the touch point, apply the cubic spline interpolation method to obtain the coordinate prediction value, and correct the ...

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Abstract

The invention discloses a coordinate capturing and correcting algorithm of an infrared multipoint touch screen. Emitting lamps and receiving lamps are distributed at the periphery of the touch screen; when a touch point appears, the coordinate of the touch point is obtained by the signal change of the receiving lamps; each receiving lamp is provided with receiving lays of multiple directions; in such a way, for the touch point, math linear equations brought by multiple lays exist, a least square method is used, the optimal solution of a coordinate value can be obtained, and the error of the coordinate value is smallest. After the coordinate is obtained more than once, especially for the constantly changing coordinate, a cubic spline interpolation method is used, and the aims of predicting the coordinate value and correcting the original measuring coordinate value are achieved.

Description

technical field [0001] The invention relates to a coordinate capture and coordinate correction algorithm of an infrared touch screen, in particular to a coordinate capture and correction algorithm of an infrared multi-point touch screen. Background technique [0002] With the iPhone launched by Apple Inc., the multi-touch technology gradually matures, and then large-size multi-touch screens appear. Infrared multi-touch screens have absolute advantages in the design of large-size touch screens. In the early conception, infrared touch screens had technical limitations such as low resolution, limited touch methods, and susceptibility to environmental interference and misoperation, so they once faded out of the market. . Since then, the second-generation infrared screen has partially solved the problem of anti-light interference, and the third and fourth generations have also improved in terms of resolution and stability. In the technical field of infrared multi-touch screen c...

Claims

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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于芳芳刘志民
Owner HEFEI UNIV OF TECH
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