Positioning device and method of electronic whiteboard system

Abstract

The invention provides a positioning device of an electronic whiteboard system. The positioning deivce is characterized in that a controller, a storage, a camera, a driver, a light emitting diode, a wireless communication module, a battery, an optical filter and a lens are arranged in a pen body of an electronic whiteboard pen. The controller controls the light emitting diode to emit light through the driver, images are obtained through the camera, image identification is performed to obtain positioning information which is sent by the wireless communication module, the light emitting diode working in an ultraviolet band is adopted to transmit ultraviolet lights, and a projection screen is characterized in that short-wave ultraviolet lights are adopted to excite fluorescent ink to print coordinate information. The invention further provides a positioning method of the positioning device of the electronic whiteboard system. The positioning device and method of the electronic whiteboard system have the advantages that shielding of the electronic whiteboard pen and the projection screen is avoided, the electronic whiteboard pen is in wireless connection with a control device of the electronic whiteboard system, the positioning performance is stable, and positioning signal interruption is avoided.

Description

technical field [0001] The invention relates to an interactive projection system, in particular to an electronic whiteboard system. Background technique [0002] The electronic whiteboard system is mainly composed of a display device, a positioning device and a control device. According to the different display devices used, the current electronic whiteboard system is roughly divided into two types, one uses a large-screen TV as a display device, and the other uses a projection instrument as a display device. Electronic whiteboard systems using large-screen TVs often use touch screens as their positioning devices. This type of electronic whiteboard system has good display effects, high positioning accuracy, and convenient operation, but in the case of large sizes, the cost is very high, and the economy is not high. It is convenient for large-scale promotion and use. Another electronic whiteboard uses a projector as a display device. This electronic whiteboard system can be...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the positioning devices of projection-based electronic whiteboard systems are realized by infrared technology or ultrasonic technology. When the pen writes on the display device, it will block a part of infrared rays or ultrasonic waves, and the coordinates of the blocked light can be obtained through the receiving device, so as to realize positioning. This method has the problems of low positioning accuracy and complicated system, especially when the human body When a certain part is blocked between the infrared and ultrasonic emitting device and the receiving device, the positioning device will make a misjudgment and cannot work normally

Another way is to install an infrared light-emitting device on the electronic whiteboard marker, install a camera on the projection device, and use the camera to capture the infrared light-emitting point for positioning. This method has high precision and the system is relatively simple, but when the electronic whiteboard When the infrared light-emitting device of the pen is blocked by the human body, the camera cannot capture the infrared light-emitting point, so the positioning device fails

Therefore, it is necessary to avoid the problem of being unable to locate due to human body blocking as much as possible, which affects the normal use of the electronic whiteboard system

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