Multi-input large-area writing method, device and system

Abstract

The invention provides a multi-input large-area writing method, a multi-input large-area writing device and a multi-input large-area writing system. The method comprises the following steps that: a handwriting input detection device detects whether a light spot enters a plane monitoring area or not; when detecting that the light spot enters the plane monitoring area, the handwriting input detection device sends trigger information to a receiver; the receiver acquires the motion trace data sensed by a luminous device generating the light spot, wherein the motion trace data is sensed by a motion sensing unit in the luminous device; and a control host computer acquires or erases the handwriting information according to the motion trace data acquired by the receiver. The method, the device and the system can remarkably reduce the requirements on the precision and speed of an independently used CMOS sensor, lower the cost, improve the accuracy and speed of inputting and erasing the handwriting information and greatly improve the cost and performance while ensuring that multiple electronic light pens and electronic erasers are used at the same time.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a multi-input large-area writing method, device and system. Background technique [0002] Electronic whiteboard is a kind of multimedia presentation equipment, which has been widely used in modern multimedia office and teaching occasions. The electronic whiteboard uses various monitoring equipment to locate various types of electronic pens or electronic erasers in the corresponding plane monitoring area, and performs data processing to obtain corresponding text or images. According to the positioning principle of the electronic whiteboard, the electronic whiteboard can be divided into six types: electromagnetic induction type, infrared type, ultrasonic type, resistance pressure sensitive type, laser positioning type, and CCD (Charge-coupled Device, charge-coupled device) camera. Among them, the most widely used ones are as follows. [0003] 1. Infrared type. The infrared r...

AI Technical Summary

Problems solved by technology

[0007] 1. Infrared type: Because the floating dust will also block a certain pair of horizontal and vertical scanning lines in the grid, it will affect the accuracy of positioning

[0008] 2. Resistive pressure-sensitive type: Since the surface of the whiteboard is composed of an elastic conductive layer film covered on a rigid conductive layer, its durability is poor, it is afraid of scratches, and the response speed is slow, so it cannot be used for large areas. And the cost is high, which is not conducive to the popularization of electronic whiteboards

[0009] 3. Linear array CCD camera: Because the current linear array CCD and other cameras are relatively expensive, the cost of electronic whiteboards is relatively high, which is not conducive to the popularization of electronic whiteboards

Images