Infrared touch screen multi-touch recognition method and device

Abstract

The invention discloses a method and a device for judging a true point when an infrared touch screen is subjected to multi-point touch, and relates to the technical field of infrared touch screens. The method comprises the following steps: determining candidate touch points, sorting the candidate touch points contained in any target touch area according to the sizes of the candidate touch points, dividing the width of each target touch area by the diameters of the corresponding candidate touch points according to the sorting, counting the candidate touch points of each target touch area which is obtained by division and has width larger than zero; then traversing the touch areas in all scanning directions, and carrying out cumulative counting on all the candidate touch points; finally, removing the candidate touch points with unchanged cumulative counting numbers, if any of the touch areas only contains one candidate touch point, then determining the candidate touch point as the true point. By adopting the method and the device provided by the invention, high precision judgment on the true touch point is realized, meanwhile, deceitful points are removed, the distinction degree of multiple points and the identification accuracy rate are improved when the multiple points are touched simultaneously, so as to improve the stability and fluency of the touch of the infrared touch screen.

Description

technical field [0001] The invention relates to the technical field of infrared touch screens, in particular to an infrared touch screen multi-touch recognition method and device. Background technique [0002] The existing infrared touch screen has a rectangular structure and consists of a long emitting side, a long receiving side, a short emitting side and a short receiving side. figure 1 It is a schematic diagram of the structure of the infrared touch screen in the related technology, such as figure 1 As shown, there are infrared emitting lamps (11-19) arranged in sequence on the emitting side of the long side, and infrared receiving lamps (21-29) are correspondingly arranged on the receiving side of the corresponding long side. Infrared emitting lamps (31-35) and infrared receiving lamps (41-45) are also respectively arranged on the receiving side, wherein the infrared emitting lamps and the infrared receiving lamps correspond one by one to form a pair of infrared emitti...

AI Technical Summary

Problems solved by technology

E.g: figure 2 It is a schematic diagram of logical touch points formed when two points are touched on the infrared touch screen, such as figure 2 As shown, the infrared touch screen is scanned horizontally and vertically one by one. When scanning, an infrared emitting lamp corresponds to an infrared receiving lamp, and an optical path is determined between the two. According to the intersection points of the two intersecting optical paths, four Logical touch points, these 4 logical touch points have two true points and two false points, which makes it impossible to accurately identify the position of the true points in these logical touch points

[0005] Therefore, it is necessary to propose an infrared touch screen multi-touch recognition method and system, which can effectively identify the tricky points that exist during multi-touch, and accurately determine the position of the real touch point, thereby avoiding misoperation due to misjudgment of the real touch point.

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