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
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[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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