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Method and device for obtaining whiteboard coordinates of electronic whiteboard, and electronic whiteboard

An electronic whiteboard and whiteboard technology, applied in the direction of electronic digital data processing, input/output process of data processing, instruments, etc., can solve the problems of high cost of camera installation and technical support, inaccurate acquisition of whiteboard coordinates, etc., to achieve installation and technical Reduced support costs and improved accuracy

Inactive Publication Date: 2015-12-16
JULONG EDUCATIONAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a whiteboard coordinate acquisition method and device for an electronic whiteboard, and an electronic whiteboard, aiming to solve the problem of adaptive acquisition after the change due to the inability of the prior art to change the deflection angle of the camera's field of view on the electronic whiteboard. The deflection angle of the field of view leads to high cost of camera installation and technical support, and inaccurate acquisition of whiteboard coordinates

Method used

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  • Method and device for obtaining whiteboard coordinates of electronic whiteboard, and electronic whiteboard
  • Method and device for obtaining whiteboard coordinates of electronic whiteboard, and electronic whiteboard
  • Method and device for obtaining whiteboard coordinates of electronic whiteboard, and electronic whiteboard

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Embodiment 1

[0032] image 3 It shows the implementation process of the whiteboard coordinate acquisition method of the electronic whiteboard provided by the first embodiment of the present invention. The electronic whiteboard is equipped with a first camera and a second camera, and the details are as follows:

[0033] In step S301, based on the perspective projection transformation, according to the display coordinates of a preset number of calibration points on the electronic whiteboard, a first mapping relationship between the display coordinates of each calibration point and the corresponding whiteboard coordinates is established.

[0034] Wherein, the number of the preset number of calibration points is at least 5, and the display coordinates of each calibration point are known, and a projector is used to project a number of calibration points with known display coordinates on the display screen to the electronic whiteboard to obtain The calibration point projected onto the electronic...

Embodiment 2

[0066] Figure 4 It shows the structure of the whiteboard coordinate acquisition device of the electronic whiteboard provided by the second embodiment of the present invention. The electronic whiteboard is equipped with a first camera and a second camera. part.

[0067] The whiteboard coordinate acquisition device of the electronic whiteboard can be used in interactive electronic whiteboards, or other large-sized electronic whiteboards with coordinate mapping functions, and can be a software unit running in the coordinate mapping of the electronic whiteboard, or can be used as an independent pendant Integrated into the electronic whiteboard or running in the application system of the electronic whiteboard, the whiteboard coordinate acquisition device of the electronic whiteboard includes a first mapping relationship establishment unit 41, an included angle tangent value acquisition unit 42, a second mapping relationship establishment unit 43, a field of view Angle acquisition...

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Abstract

The invention belongs to the technical field of electronic whiteboards and provides a method and a device for obtaining coordinates of a whiteboard of an electronic whiteboard and the electronic whiteboard. The method includes: building a first mapping relation of the display coordinate of each calibrating spot and a corresponding coordinate of the whiteboard on the basis of perspective projection transformation; obtaining tangent values of a first included angle and a second included angle according to camera parameters and the pixel coordinate of each calibrating spot; building a second mapping relation of the pixel coordinate of each calibrating spot and a corresponding coordinate of the whiteboard according to the tangent values of the first included angle and the second included angle; obtaining tangent values of a first view field deflection angle and a second view field deflection angle according to the first mapping relation and the second mapping relation; and obtaining the whiteboard coordinate of each calibrating spot according to the second mapping relation and the tangent values of the first view field deflection angle and the second view field deflection angle. According to the method, the device and the electronic whiteboard, changed view field deflection angles of a camera can be obtained through self adapting, and the whiteboard coordinates of targets can be accurately obtained according to the view field deflection angles.

Description

technical field [0001] The invention belongs to the technical field of electronic whiteboards, and in particular relates to a method and device for acquiring whiteboard coordinates of an electronic whiteboard and the electronic whiteboard. Background technique [0002] The electronic whiteboard is based on the traditional whiteboard, with additional electronic equipment and related software to realize human-computer interaction functions such as touch control and text entry on the whiteboard. Existing electronic whiteboards based on infrared cameras are composed of the following parts: two infrared cameras installed on the two corners of the frame of the whiteboard, infrared emitting tubes below each infrared camera, and affixed to the lower frame of the whiteboard and the two vertical frames. Infrared reflective film and corresponding control circuit. The infrared rays emitted by the infrared emission tube irradiate the reflective film and then reflect back to the camera. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042
Inventor 诸健王忆文李辉王晓婷
Owner JULONG EDUCATIONAL TECH