Handwriting input method, device and system and receiver

Abstract

The embodiment of the invention provides a handwriting input method, a handwriting input device, a handwriting input system and a receiver. The method comprises the following steps of: calculating the X axis position information of a light spot acquired by using at least one optical positioning sensor and the Y axis position information of the light spot acquired by the at least one optical positioning sensor to obtain the coordinate information of the light spot, wherein the optical positioning sensor comprises a complementary metal oxide semiconductor (CMOS) optical positioning sensor; acquiring the planar track data of the light spot according to the coordinate information; and transmitting the planar track data to the receiver, so that a control host computer acquires corresponding handwritten information or wipes the handwritten information according to the planar track data received by the receiver. Due to the adoption of the method, the device, the receiver and the system, inputting of the handwritten information and wiping of corresponding information by a user can be realized simply, conveniently and correctly and the cost is saved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a handwriting input method, device, receiver 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. More are the following. [0003] 1. Infrared type. The infrared receiving and emitting tubes dense...

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: the algorithm to calculate the position of the luminescent electronic pen by calculating the intersection point of the triangle is relatively complicated

Moreover, due to the relatively expensive cameras such as the current linear array CCD, the cost of the electronic whiteboard is relatively high, which is not conducive to the popularization of the electronic whiteboard.

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