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A Fast Algorithm Applicable to Large Size Infrared Touch Screen

An infrared touch screen, fast algorithm technology, applied in the input/output process of calculation, data processing, instruments, etc., can solve the problems of inaccurate coordinate calculation and slow calculation speed of large-size infrared touch screen.

Inactive Publication Date: 2016-07-13
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a fast algorithm suitable for large-size infrared touch screens to solve the problems of slow calculation speed and inaccurate coordinate calculation of large-size infrared touch screens

Method used

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  • A Fast Algorithm Applicable to Large Size Infrared Touch Screen
  • A Fast Algorithm Applicable to Large Size Infrared Touch Screen
  • A Fast Algorithm Applicable to Large Size Infrared Touch Screen

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Embodiment Construction

[0016] Such as figure 1 shown. When touch point A exists on the touch screen, use figure 1 Take the 8 blocked rays as an example, where rays 1 and 5 are in the same direction, rays 3 and 4 are in the same direction, rays 6 and 7 are in the same direction, rays 2 and 8 are in the same direction, any two different directions For rays such as 1 and 3, the equation of the rays can be obtained through the position and angle of the rays, and then the intersection point of rays 1 and 3 can be obtained, and then the coordinates of the intersection point can be converted into the coordinates of the pixel point, or the corresponding points can be directly obtained by looking up the table of rays 1 and 3 The pixel coordinates of . In the same way, the coordinate values ​​of all blocked pixels are obtained according to the intersecting rays in different directions, and the flag bits of the corresponding pixels are added by 1 and accumulated.

[0017] In order to improve the calculation...

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Abstract

The invention discloses a rapid algorithm suitable for a large-sized infrared touch screen. The rapid algorithm comprises the following steps: acquiring light rays containing touch information; optionally selecting two intersecting straight lines to obtain a touch coordinate; converting the coordinate information into pixel information; adding 1 to the flag bit of a pixel; calculating all intersecting straight lines; accumulating the flag bits of corresponding pixels; performing corresponding processing on pixel areas of which the flag bits are larger than a certain value taken as shielded areas, wherein the shape of a final area is the shape of a touched object, and the central coordinate of the area is the central coordinate of the touched object. By adopting the rapid algorithm, coordinates can be calculated rapidly and accurately.

Description

technical field [0001] The invention relates to the field of infrared touch screens, in particular to a fast algorithm suitable for large-size infrared touch screens. Background technique [0002] In recent years, as a new type of human-computer interaction device, touch screen has become more and more popular due to its naturalness and convenience. With the development of science and technology, single-point touch screens can no longer meet people's needs, and multi-point touch screens have emerged as the times require. At present, the multi-point touch screens that are widely used in development are mainly divided into capacitive touch screens and infrared touch screens. Capacitive multi-point touch screens are mainly used in small-sized devices, but they are not suitable for large sizes due to their own reasons. Infrared touch screens have installation Convenience, long service life, high light transmittance, etc., especially in large-size applications, have more advanta...

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于芳芳刘志民
Owner HEFEI UNIV OF TECH