Method and device of positioning and displaying active pen

A display method and active pen technology, applied to instruments, electrical digital data processing, input/output process of data processing, etc., can solve problems such as the inconsistency between the contact position of the writing pen and the display position, and meet real-time requirements and realize Simple, computationally-intensive effects

Inactive Publication Date: 2011-04-06
GUANGDONG VTRON TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The first technical problem to be solved by the present invention is to provide a method for positioning and displaying an active pen, so that the method can overcome the problems caused when the active pen is not perpendicular to the writing screen and the position of the writing screen is skewed. The defect that the contact position of the writing pen is inconsistent with the display position

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  • Method and device of positioning and displaying active pen
  • Method and device of positioning and displaying active pen
  • Method and device of positioning and displaying active pen

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Embodiment Construction

[0032] Embodiments of the active pen positioning display and the active pen positioning display method of the present invention will be described below with reference to the accompanying drawings.

[0033] like Figure 4 As shown, the active pen positioning display method includes the following steps:

[0034] Step S10: The CMOS image sensor captures the entire image of the touch screen at a rate of 60 frames / s. When the active pen touches the screen, the screen will generate a spot highlight area, and use the difference between the two frames of images to extract the spot image. Saturation threshold H (the present invention gets H=0.25) is set, and spot image is carried out binarization processing, and the pixel point less than threshold value is exactly background, and the pixel point greater than threshold value is exactly target image area;

[0035] Step S20: use the FPGA chip combined with the SUSAN operator to calculate the area and / or the number of edge points of the t...

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PUM

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Abstract

The invention relates to an electronic inputting and displaying method, in particular to a method for positioning and displaying writing of an active pen. The method comprises the following steps of: S10 extracting a light spot image of the active pen and binarizing the light spot image to obtain a target image; S20 calculating by using an SUSAN operator to obtain a first stroke coordinate of the active pen; S30 converting the first stroke coordinate to a screen displaying position coordinate and sending to a computer; and S40 controlling a projector to display the writing track of the active pen by using a computer according to the displaying position coordinate. The method in the invention overcomes the defect that the contact position of the active pen is inconsistent with the screen displaying position. Furthermore, the invention also discloses a positioning and displaying device of the active pen.

Description

technical field [0001] The invention relates to an electronic input display method, in particular to a writing positioning display method of an active pen. Background technique [0002] The multi-touch system based on optical sensing is that the user touches the surface of the projection screen to affect the input result of the optical sensing imaging device. The imaging device inputs the imaging result into the software system for processing. Generally, it goes through three steps. First, the original input image is included. Correction, filtering and other preprocessing, and then track the contact through the spot tracking engine, and interpret it as various input states, and finally send the input position, state and other information to the upper application program. The application processing results are finally projected onto the display screen surface, thereby creating a true WYSIWYG interaction effect with the user. [0003] At present, there is a multi-touch techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
Inventor 肖平韦金汝
Owner GUANGDONG VTRON TECH CO LTD
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