Infrared touch screen multi-point recognizing method

Abstract

The invention discloses a multi-point recognition method of an infrared touch screen, which comprises steps as follows: a system performs vertical scanning to determine whether an object's coordinate is acquired or not, an identification number is created for the seized object while the coordinate value of the object is recorded so as to determine whether more than one object's coordinate is existed or not, serial-number ranges of receiving tubes on an X axis and a Y axis where signals are changed abnormally are taken to create overlap regions on the X axis and the Y axis for each object, coordinates of the overlap regions on the X axis and the Y axis are compared in groups of every two objects so as to conform crossed areas of the overlap regions on the X axis and / or the Y axis, then the crossed areas are progressively scanned out of the vertical, actual coordinate values of the objects are output according to the signal variation of the receiving tubes, and finally the overlap regions of all the objects are compared. The invention has the advantages that the invention can automatically select a target region to scan via multiple angles, thereby shortening the required time of multi-point scanning, increasing the accuracy of scanning, and realizing the quick recognition of multi-point moving objects.

Description

technical field [0001] The invention relates to an infrared touch screen coordinate detection technology, in particular to a technology for detecting coordinates of multiple touch points. Background technique [0002] In the existing infrared touch screen system, the vertical scanning method is usually used, and generally only single-point touch recognition can be achieved. When more than one touch object touches the surface of the screen, due to the mutual occlusion of the objects, some touch objects The X or Y coordinates of the X or Y coordinates completely or partially overlap, and touch detection and judgment cannot be realized. For example, the following are two very typical multi-point recognition situations: [0003] The first one, as shown in Figure 1, is the case of uniaxial overlap. The infrared emitting tube 1 and the infrared receiving tube 2 are respectively arranged opposite to each other. The coordinates on the axis are too close to each other, causing the Y...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the inability to quickly and effectively identify multi-point touches in the existing infrared touch technology, and at the same time, without increasing the hardware, use the existing infrared touch screen hardware structure to achieve a fast identification and detection Infrared touch screen multi-point recognition method

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