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Multipoint identification method and system for infrared touch screen

An infrared touch screen, multi-point recognition technology, applied in instruments, electrical digital data processing, data processing input/output process, etc., can solve the problems of low precision, large touch object area, and many ghost points

Inactive Publication Date: 2012-04-18
BEIJING IRTOUCH SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, some manufacturers have launched infrared touch screens with multi-point (10-point) recognition functions in the market, but there are many disadvantages in effect.
For example, there are many ghost points, low precision, and a large area of ​​the touch object is required

Method used

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  • Multipoint identification method and system for infrared touch screen

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Experimental program
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Embodiment 1

[0128] This embodiment provides a multi-point recognition system and a multi-point recognition method of an infrared touch screen, such as figure 1 As shown, the multi-point recognition system includes a data acquisition device 1, an image generation device 2, an attribute establishment device 3, a touch point information extraction device 4, and a motion tracking device 5, wherein the attribute establishment device 3 includes an optical path determination unit 31 and an attribute recording unit 32 ; the touch point information extraction device 4 includes a target point search unit 41 , a clustering unit 42 , and a touch point calculation unit 44 .

[0129] The data collection device 1 is used to collect optical path data during a recognition process.

[0130] The image generation device 2 is used to generate an image with a preset ratio to the size of the infrared touch screen.

[0131] The attribute establishing means 3 is used to establish the attribute associated between...

Embodiment 2

[0182] In Embodiment 1, the method for searching the target point by the target point search unit 41 in step 2041 is to traverse each pixel in turn, and judge whether the current pixel is the target point according to the occlusion of the light path associated with the pixel. In fact, after The light path of the touch point is blocked, so in order to quickly identify the touch point, you can only judge the pixels that the blocked light path passes, and other pixels do not need to judge, such as Figure 9 , the specific method of finding the target point is as follows:

[0183] ① According to the light path data, each blocked light path is traversed, and the number of light paths associated with the pixels passed by each blocked light path is reduced by 1.

[0184] Traversing the first blocked light path, if the light path passes through m pixels, where m is a positive integer, reduce the number of light paths associated with the m pixels by 1, and process all blocked light pat...

Embodiment 3

[0190] In Embodiment 1 and Embodiment 2, the touch point information extraction device 4 obtains several cluster sets by clustering the identified target points when extracting the touch point information, and uses each cluster set as a Touch points, in the actual application process, even if a series of cluster sets are obtained based on density clustering, these cluster sets are not necessarily all touch points, and some cluster sets with small areas may be due to the occlusion of actual touch points. is generated due to the occlusion of the actual touch point, in order to further reduce the probability of misjudgment, such as Figure 10 As shown, the touch point information extraction device 4 can also include an area judging unit 43, which is used to sequentially judge whether the area covered by each cluster set is greater than the set area threshold, the area judging unit sets the area threshold, and judges in turn Whether the area covered by each cluster set is greater ...

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Abstract

The invention provides a multipoint identification method and a multipoint identification system for an infrared touch screen. The method comprises the following steps of: acquiring light path data; generating an image / data structure which is in a preset proportion to the size of the infrared touch screen; establishing the attribute that pixels / data elements are correlated with light paths on the infrared touch screen; and extracting touch point information according to the attribute that the pixels / data elements are correlated with the light paths on the infrared touch screen and the light path data. The number of the light paths correlated with the image pixels / data elements is changed through the light path data; and when the number of the light paths correlated with a certain image pixel / data element is changed into zero, the image pixel / data element is marked as a target point, the target points are clustered according to the density of the marked target points, and the target points clustered into the same type form one touch point. By determining the target points according to the orders of magnitude of the image pixels or the data elements, ghost points and noise points can be effectively removed, and high identification precision can be achieved.

Description

technical field [0001] The invention relates to an infrared touch screen multi-point recognition method and system, in particular to an infrared multi-point recognition method and system based on density clustering. 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 crossing infrared matrix ...

Claims

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Application Information

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IPC IPC(8): G06F3/042
CPCG06F2203/04104G06F3/0416G06F3/0421G06F3/04166
Inventor 李振宇王武军叶新林刘建军刘新斌
Owner BEIJING IRTOUCH SYST CO LTD
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