Electronic whiteboard, coordinate mapping method for same, device

An electronic whiteboard and coordinate mapping technology, applied in the field of coordinate mapping, can solve problems such as large mapping errors and inaccurate mapping, and achieve the effect of improving accuracy and reducing mapping errors

Inactive Publication Date: 2012-07-18
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 coordinate mapping method and device for an electronic whiteboard, and the electronic whiteboard, aiming at solving the problem of large mapping errors when using the existing mapping method to map the physical coordinates on the electronic whiteboard to the display coordinates on the display screen. Large, imprecise mapping issues

Method used

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  • Electronic whiteboard, coordinate mapping method for same, device
  • Electronic whiteboard, coordinate mapping method for same, device
  • Electronic whiteboard, coordinate mapping method for same, device

Examples

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Embodiment 1

[0041] figure 2 The implementation process of the coordinate mapping method of the electronic whiteboard provided by the first embodiment of the present invention is shown, and the details are as follows:

[0042] In step S201, according to the whiteboard coordinates of the preset number of calibration points on the electronic whiteboard, four adjacent calibration points capable of forming a quadrilateral are used as a group to divide the entire electronic whiteboard plane into a plurality of block regions.

[0043] Before step S201, the coordinate mapping method of the electronic whiteboard also includes obtaining the whiteboard coordinates of a preset number of calibration points on the electronic whiteboard by using existing technology, specifically including the following steps:

[0044] Use the projector to project several calibration points with known display coordinates on the display screen to the electronic whiteboard, and use a special whiteboard marker or other pen...

Embodiment 2

[0100] Figure 5 The structure of the coordinate mapping device of the electronic whiteboard provided by the second embodiment of the present invention is shown, and for the convenience of description, only the parts related to the embodiment of the present invention are shown.

[0101] The coordinate mapping device of the electronic whiteboard can be used in interactive electronic whiteboards, or other large-sized electronic whiteboards with coordinate mapping functions. It can be a software unit running in the coordinate mapping of the electronic whiteboard, or it can be integrated as an independent pendant In the electronic whiteboard or in the application system of the electronic whiteboard, the coordinate mapping device of the electronic whiteboard includes a block unit 51, a center point coordinate acquisition unit 52, a coefficient acquisition unit 53 and a display coordinate acquisition unit 54, wherein:

[0102] The block unit 51 is used to divide the entire electroni...

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PUM

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Abstract

The invention provides an electronic whiteboard, a coordinate mapping method for the same and a device, which are applicable to the technical field of coordinate mapping. The coordinate mapping method includes grouping each four adjacent correction points capable of forming a quadrangle; dividing a plane of the integral electronic whiteboard into a plurality of sub-block areas according to whiteboard coordinates of a preset amount of correction points; acquiring whiteboard coordinates and display coordinates of a central point of each sub-block area according to the whiteboard coordinates and display coordinates of the corresponding correction points of the sub-block area; building mapping relation of the whiteboard coordinate and the display coordinate based on prospective projection transformation, and acquiring a mapping coefficient corresponding to each sub-block area according to the mapping relation of the whiteboard coordinates and the display coordinates and the whiteboard coordinates and the display coordinates of the four correction points and the central point of each sub-block area; and acquiring display coordinates of an optional object on the electronic whiteboard according to the mapping coefficients of the sub-block areas with the object, the whiteboard coordinates and the mapping relation. Accordingly, errors of mapping from the whiteboard coordinates to the corresponding display coordinates are reduced, and mapping accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of coordinate mapping, and in particular relates to a coordinate mapping method and device 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 upper two corners of the whiteboard, infrared emission tubes under each infrared camera, and infrared reflection tubes attached to the lower frame of the whiteboard and the two vertical frames. Membrane and corresponding control circuit. The infrared rays emitted by the infrared emitting tube irradiate the reflective film and then reflect back to the camera. A bright band appe...

Claims

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Application Information

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