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Electronic whiteboard trace tracking method and apparatus

A trajectory tracking and electronic whiteboard technology, which is applied in the input/output process of electronic digital data processing, instruments, and data processing, etc., can solve the problems that the electronic whiteboard trajectory tracking method is not accurate enough, cannot distinguish the trajectory route, breakpoints, etc.

Inactive Publication Date: 2016-04-06
SHENZHEN HONGHE INNOVATION INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an electronic whiteboard trajectory tracking method and device in view of the deficiencies of the prior art, which overcomes the inaccuracy of the electronic whiteboard trajectory tracking method in the prior art, often causing breakpoints, trajectory crossing and even failure. Deficiencies in Distinguishing Trajectory Routes

Method used

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  • Electronic whiteboard trace tracking method and apparatus
  • Electronic whiteboard trace tracking method and apparatus
  • Electronic whiteboard trace tracking method and apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0060] The electronic whiteboard trajectory tracking method of the present invention comprises the steps of:

[0061] A1. Mark at least one trajectory curve to be tracked;

[0062] A2. Calculate the distance between each sampling coordinate and the last point curve coordinate of each track curve in turn and determine the minimum distance in the distance;

[0063] A3, set the distance threshold;

[0064] A4. Compare the minimum distance value and the distance threshold value. If the minimum distance value is greater than the distance threshold value, set the sampling coordinates corresponding to the minimum distance value as the starting point of the new trajectory curve, otherwise set the sampling coordinates corresponding to the minimum distance value to correspond to the minimum distance value. The new curve coordinates of the trajectory curve where the curve coordinates of are located.

[0065] It further includes step A5: if the trajectory curve does not match the new cu...

Embodiment 2

[0067] The electronic whiteboard trajectory tracking method of the present invention comprises the steps of:

[0068] A1. Mark at least one trajectory curve to be tracked;

[0069] A2. Calculate the angle between each sampling coordinate and the vector determined by the last point curve coordinate of each trajectory curve and the vector determined by the last point curve coordinate of each trajectory curve and its adjacent curve coordinates in turn, and determine the smallest angle among the included angles value;

[0070] A3. Set the included angle threshold;

[0071] A4. Compare the minimum angle value and the angle threshold value. If the minimum angle value is greater than the angle threshold value, set the sampling coordinate corresponding to the minimum angle value as the starting point of the new trajectory curve, otherwise set the sampling coordinate corresponding to the minimum angle value as the minimum angle value. The new curve coordinates of the track curve wher...

Embodiment 3

[0074] The electronic whiteboard trajectory tracking method of the present invention comprises the steps of:

[0075] A1. Mark at least one trajectory curve to be tracked;

[0076] A2. Calculate the distance between each sampling coordinate and the last point curve coordinate of each track curve in turn and determine the distance minimum value in the distance, and calculate the vector determined by the last point curve coordinate of the track curve corresponding to the distance minimum value and the last point curve coordinate of the track curve The angle between the vectors determined by the coordinates of its adjacent curves;

[0077] A3. Set the included angle threshold;

[0078] A4. Compare the included angle with the included angle threshold. If the included angle is greater than the included angle threshold, set the sampling coordinate corresponding to the minimum distance as the starting point of the new trajectory curve; otherwise, set the sampling coordinate correspo...

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Abstract

The present invention discloses an electronic whiteboard trace tracking method and apparatus. The method comprises the steps of: marking at least one to-be-tracked trace curve; calculating distances between each sample coordinates and curvilinear coordinates of the last point in each trace curve successively, and determining a distance minimum among the distances; setting a distance threshold; and comparing the distance minimum with the distance threshold, and if the distance minimum is greater than the distance threshold, setting the sample coordinates corresponding to the distance minimum as a starting point of a new trace curve, or otherwise setting the sample coordinates corresponding to the distance minimum as new curvilinear coordinates of the trace curve where the curvilinear coordinates corresponding to the distance minimum are located. The apparatus comprises a calculation module and a comparison module which are successively connected. According to the method and apparatus provided by the present invention, the distance threshold and an angle threshold are set for further determination of the calculated distances and a vectorial angle during the electronic whiteboard touch trace tracking process, so that the sample coordinates can be matched on the trace curve more accurately, and tracking errors such as point breaking and track crossing are avoided.

Description

technical field [0001] The invention relates to the technical field of electronic whiteboards, in particular to an electronic whiteboard trajectory tracking method and device. Background technique [0002] Interactive electronic whiteboard is an advanced education or meeting auxiliary human-computer interaction equipment. It can cooperate with projectors, computers and other tools to realize functions such as dust-free writing, free writing, and remote communication. From the perspective of structural shape, there are various forms such as front projection, rear projection, and writing board; from the perspective of hardware principles, interactive electronic whiteboards integrate large-screen projection technology and precise positioning testing technology. In the international or domestic market at this stage, there are many technologies that can realize the precise positioning of electronic whiteboards. The representative ones are infrared, electromagnetic induction, capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
Inventor 徐协增王志勇卢肇川
Owner SHENZHEN HONGHE INNOVATION INFORMATION TECH CO LTD
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