Multipoint touch screen interactive system based on LABVIEW

Abstract

The invention provides a set of multipoint touch screen interactive system based on LABVIEW software, which comprises a hardware part and a software part, wherein the hardware part is characterized in that an infrared ray incoming from the side of the glass is totally reflected in the glass by utilizing a frustrated total reflection principle of acrylic glass; the total reflection is damaged when a finger touches the screen; the infrared ray is emitted from the lower surface of the touch point; a USB (universal serial bus) camera with an infrared filter is installed below and used for capturing an image with infrared light spots; and the image is transferred to a computer and processed by the LABVIEW software. The software part is realized by utilizing a related function of a visual and motion module in the LABVIEW software. The hardware part of the system has the advantages of quick response, high sensitivity, high precision, low cost, good anti-interference and the like. The software part of the system has the advantages that the programming language has a simple structure, is direct, concise and understandable, is easy to modify and the like. Generally, the multipoint touch screen interactive system is characterized by strong transportability and strong expandability.

Description

technical field [0001] The invention relates to a set of LABVIEW-based multi-touch screen human-computer interaction system, in particular to a set of finger multi-touch collection, identification and processing system including hardware system and software system. Background technique [0002] At present, touch screens on the market mainly include resistive touch screens, capacitive touch screens and optical principle touch screens. Resistive touch screens and capacitive touch screens are designed using complex electrical principles. Generally, only single-point or two-point touch recognition can be realized. The product touch area is small, and the cost of manufacturing a large-area touch screen is high. Optical principle There are many types of touch screen principles, such as front diffuse lighting, back diffuse lighting, infrared array, laser, etc., but each design has certain shortcomings, and there are few software systems that match the existing hardware systems , T...

AI Technical Summary

Problems solved by technology

And the design does not involve software solutions to match the hardware

In the method described in [3], only one side of the glass plate is illuminated by an infrared lamp, and the other three sides use reflective strips to reflect the infrared rays emitted by it. This method will reduce the touch accuracy, and the infrared camera is expensive. General users cannot afford it, and there is no application processing method on the software, which limits portability and scalability

The method described in [4] requires a lot of equipment, and the infrared optical device and infrared receiver are relatively expensive, have poor stability, are susceptible to external interference, and the entire device takes up a large space, so it is not suitable for teaching, public places, etc.

[0006] There has not been a multi-touch interactive system that can meet various needs in hardware, is simple and easy to understand in software, and has strong portability and scalability.

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