Method for accurately calculating screen coordinates of touch points in distortion projection plane of electronic white board

Abstract

The invention relates to a method for accurately calculating screen coordinates of touch points in a distortion projection plane of an electronic white board and belongs to the technical field of electronic white boards. The method comprises the following steps: determining the constrained relationship among calibration points, touch points and the screen coordinates of touch points; using an electronic white board positioning device to acquire the coordinates of the calibration points and storing the coordinates of the calibration points; and taking use of the constrained relationship to calculate the screen coordinates Xdisp and Ydisp of the touch points. The method provided by the invention has the advantages of correctly calculating the screen coordinates of the touch points by only using the calibration points and ensuring the superposition of the positions of the touch points and a mouse in the projection plane in spite of such projection plane distortions as slope, vertical trapezoid and horizontal trapezoid, thus reducing the calculation amount and improving the timeliness of the system.

Description

technical field [0001] The invention belongs to the field of electronic whiteboards, and specifically relates to an interactive electronic whiteboard using a projector. When the projection surface is distorted, it can realize the accurate calculation of the computer screen coordinates of the operating points in the distorted projection surface: electronic pen and touch pen, and improve the distortion projection. The accuracy of the interaction in the face. Background technique [0002] The interactive electronic whiteboard can communicate with the computer, connect the electronic whiteboard to the computer, and use the projector to project the content on the computer to the electronic whiteboard screen. With the support of special applications, a large screen, interactive style collaborative meeting or teaching environment. Use a specific writing pen or locating pen to replace the mouse to operate on the whiteboard, you can run any computer application program, and you can ...

AI Technical Summary

Problems solved by technology

[0014] The present invention provides an accurate calculation method for the screen coordinates of touch points in the distorted projection plane of an electronic whiteboard to solve the problem of decreased accuracy when the projection plane of the electronic whiteboard system is distorted. The method is applicable to interactive electronic whiteboards with various positioning principles system

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