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Multi-point identification method and system of infrared touch screen

An infrared touch screen, multi-point recognition technology, applied in the input/output process of data processing, instruments, electrical digital data processing and other directions, can solve the problem of time-consuming and other

Inactive Publication Date: 2014-04-02
BEIJING IRTOUCH SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the method and system are processed based on the whole or part of the image, it is time-consuming

Method used

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  • Multi-point identification method and system of infrared touch screen

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Experimental program
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Embodiment approach 1

[0075] This embodiment describes a multi-point recognition system and method for an infrared touch screen. Such as figure 1 As shown, the system includes a data structure generation device 11 , a touch point information extraction device 12 and a touch point tracking device 13 . Wherein, the data structure generation device 11 includes a collection unit 111, an initial data structure generation unit 112, and a data structure element value determination unit 113, and the touch point information extraction device 12 includes a denoising unit 121, a smoothing edge unit 122, an outline refinement unit 123, Extraction unit 124 and calculation unit 125 .

[0076] The data structure generation device 11 is used to generate a data structure with a two-dimensional matrix arrangement property corresponding to the optical path of the infrared touch screen during a recognition process. Wherein the acquisition unit 111 is used to collect the optical path data of the infrared touch screen...

Embodiment approach 2

[0124] In Embodiment 1, each step processes the entire array. Since the approximate position of each touch point area can be quickly obtained through the initial optical path data, the rough area set of the touch point can be obtained first, and subsequent operations are only performed on these areas. In this way, the processing speed will be greatly improved, but the basic idea is the same as that of Embodiment 1. The specific process is as follows:

[0125] First, an initial array with a preset ratio M to the size of the infrared touch screen is generated, and its element values ​​are all 0. The rough areas of the candidate touch points are calculated according to the optical path data, which are approximately rectangular areas. For this, as Figure 11 As shown, on the basis of the first embodiment, the system of this embodiment adds a touch point area determination device 14 . If no candidate touch point area is obtained after calculation based on the optical path data,...

Embodiment approach 3

[0130] Since there is not necessarily a touch operation during a recognition process, if no touch operation occurs during a recognition process, it is not necessary to perform the same process as described in Embodiment 1 or 2, but it will also occupy system resources. , leading to a decrease in recognition efficiency.

[0131] Such as Figure 13 and 14 As shown, in this embodiment, on the basis of Embodiment 1 or Embodiment 2, a pre-judgment device 15 is added to pre-judge whether a touch point exists according to the optical path data. The specific judgment method may adopt any method in the prior art, which will not be repeated here.

[0132] In a recognition process, after the optical path data is collected, the pre-judgment device first judges whether there is a touch point according to the optical path data. If there is no touch point, this identification is ended; if there is a touch point, then the method in Embodiment 1 or Embodiment 2 is used to identify the touch...

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Abstract

The present invention relates to a multipoint recognition method and system of an infrared touch screen. The present invention comprises: first generating a data structure, corresponding to optical paths on an infrared touch screen in a recognition process, with a two-dimensional matrix arrangement property; and then extracting touch point information according to the data structure. Preferably, in a recognition process, it is determined, according to optical path data, whether a touch point exists on the infrared touch screen; if no, the current recognition process is ended. Preferably, if a touch point exists, an area where the touch point is located is further determined according to the optical path data, and a data structure corresponding to an optical path in the area is generated for the area where the touch point is located; and then touch point information is extracted according to the data structure. The present invention provides a novel multipoint recognition method and device of an infrared touch screen, which are applicable to recognition of multiple touch points, have a high touch response speed and high recognition precision, and have no ghost point or only a few ghost points.

Description

technical field [0001] The invention relates to a method and system for recognizing touch points on a touch screen, in particular to a method and system for multi-point recognition of an infrared touch screen based on image processing. Background technique [0002] With the development of touch technology, touch screens are widely used as a simple and convenient human-computer interaction device. Currently, the types of touch screens mainly include resistive touch screens, capacitive touch screens, surface acoustic wave touch screens, optical touch screens, and infrared touch screens. Among them, the infrared touch screen uses the infrared matrix densely distributed in the X and Y directions to detect and locate the user's touch operation. The infrared touch screen installs a circuit board frame in front of the display, and the circuit board arranges infrared emitting tubes and infrared receiving tubes on the four sides of the screen, forming a horizontal and vertical cross...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042
CPCG06F3/042G06F3/0416G06F3/04166
Inventor 王武军刘新斌刘建军叶新林
Owner BEIJING IRTOUCH SYST CO LTD
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