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Track smoothing method and apparatus for capacitive whiteboard

A trajectory smoothing and trajectory technology, applied in the electronic field, can solve problems such as unsatisfactory smoothing effect and large amount of calculation

Active Publication Date: 2016-06-29
HITEVISION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of unsatisfactory smoothing effect and large amount of calculation in the prior art, the present invention proposes a smoothing method of "fixed area, limited number of points" and its corresponding device. The method and its device have high computing efficiency and smooth The effect is closer to the actual characteristics, specifically:

Method used

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  • Track smoothing method and apparatus for capacitive whiteboard
  • Track smoothing method and apparatus for capacitive whiteboard
  • Track smoothing method and apparatus for capacitive whiteboard

Examples

Experimental program
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Embodiment 1

[0062] Embodiment 1 of the present invention is a preschool education whiteboard, which is mainly used in interactive teaching occasions such as children's playboards and courseware display.

[0063] figure 1 It is a schematic flow chart for coordinate detection of a capacitive whiteboard in Embodiment 1 of the present invention. The described coordinate detection method for capacitive whiteboard comprises the steps:

[0064] Step 101, collect touch points.

[0065] Step 102, judging whether the collected touch point belongs to an existing track, if yes, go to step 103 directly, otherwise, first establish a storage structure and then go to step 103.

[0066] In all embodiments of the present invention, the trajectory coordinates refer to coordinates smoothed according to actual coordinates (sampling coordinates).

[0067] In this embodiment, a circle is used as a fixed area, D takes a value of 5 mm, and N takes a value of 5. Two sets of data of actual coordinates and track ...

Embodiment 2

[0085] In embodiment 1, use the actual coordinates (sampling coordinates, coordinates that have not been smoothed) to calculate the trajectory coordinates of the newly added point. As another change of the present invention, you can also use the trajectory coordinates (coordinates obtained after the actual coordinates are smoothed) to carry out Calculation of the mean. Embodiment 2 of the present invention is a business whiteboard, which is mainly used for displaying promotional materials and products, and its length and width are both above 2000mm in size. The system parameters are D=50mm, N=30mm. Moreover, considering the hardware burden, only the set of trajectory coordinate data is stored in the system, that is, only the last N trajectory coordinate points on the trajectory are stored in the storage structure, and the "queue" mechanism is used to update the coordinate points. The logical judgment of the area, the calculation of the number of track points in the fixed area...

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Abstract

The invention discloses a track smoothing method and apparatus for a capacitive whiteboard. A numerical value D used for defining a certain dynamic region on a screen is set in the system initially, and the following steps are further implemented: (1) a newly-added point coordinate of a certain track is obtained by sampling; (2) the last track coordinate point of the track is read from a storage structure; if the newly-added coordinate point is the first point of the track, the storage structure is established, and the point coordinate is stored and the coordinate value is taken as the smoothened track coordinate; (3) the track point number n in a fixed region formed by the D and the last track coordinate point is calculated; and (4) the track coordinate of the newly-added point is calculated based on the point number n participated in the moving average value calculation of the newly-added point, the corresponding point coordinate and the newly-added point coordinate obtained in the step (1) according to a moving average value formula. Therefore, relatively high calculation efficiency for the track smoothening of the capacitive whiteboard can be realized.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a track smoothing method and device for a capacitive whiteboard. Background technique [0002] Trajectory smoothing refers to some kind of correction to the coordinate points that make up the trajectory of the object, so that the generated trajectory is smooth and round, which conforms to the changing trend of the object's motion. [0003] The moving average method is a commonly used trajectory smoothing algorithm in interactive display devices. Its basic idea is to average a certain number of coordinate points on the trajectory to the newly added coordinate points, and use the corrected average coordinates as the final trajectory coordinates. According to the number of points involved in the average calculation of trajectory coordinates, the moving average method can be divided into two types: fixed points and variable points. The former uses a fixed number of points to calculate the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 不公告发明人
Owner HITEVISION CO LTD
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