Handwriting input calibrator and calibration method thereof

Abstract

The invention discloses a handwriting input calibrator, which comprises a receiving box, a handwriting pen, a pressure sensor and an ultrasonic generator, wherein the pressure sensor and the ultrasonic generator are arranged at the lower end of the handwriting pen; left-end and right-end ultrasonic receivers and a central processing unit (CPU) controller are arranged in the receiving box; one ultrasonic generator is also arranged at the upper end of the handwriting pen; ultrasonic signals which are simultaneously generated by the ultrasonic generators at two ends of the handwriting pen are received by the left-end and right-end ultrasonic receivers of the receiving box and input to the CPU controller; and the signals are converted by the CPU controller, and x and y coordinate values of displacement of a handwriting pen point are calculated. The position change of the pen point caused by different handwriting modes or habits is calculated by detecting time in which ultrasonic waves of the upper and lower ends of a pen holder arrive at the left-end and right-end ultrasonic receivers, and a displacement difference is accurately compensated according to the x and y coordinate values which are detected and calculated by the CPU controller, so the positions of lines or graphs which are written on paper by the handwriting pen completely correspond to the lines or the graphs which are displayed on a display screen of the computer, and the inconformity or variation of handwritings which are stored and displayed by the computer and the handwritings which are formed on the paper by the handwriting pen point is eliminated.

Description

[0001] technical field [0002] The present invention relates to a computer handwriting input method, in particular to a computer handwriting input calibrator and a calibration method thereof. Background technique [0003] With the rapid development of computer and network technology, as well as the rapid popularization of computers, mobile phones and personal digital assistants (PDAs), there is an urgent need for simple, fast and accurate handwriting input methods and devices for the input and access of information and numbers. There is an ultrasonic type handwriting input device, which can convert the handwritten trajectory into a digital quantity of x and y coordinates and input it into a computer, and apply the corresponding operating software and driver program to directly display the written trajectory on the computer display screen. You can record by hand, and you can edit or modify lines and patterns. In actual use, people gradually find that with the difference in t...

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of computer and network technology, and the rapid popularization of computers, mobile phones and personal digital assistants (PDAs), there is an urgent need for simple, fast and accurate handwriting input methods and devices for input and access of information and numbers. There is an ultrasonic handwriting input device, which can convert the handwriting track into digital quantities of x and y coordinates and input it into the computer, and apply the corresponding operating software and driver program to directly display the written track on the computer display screen. It can be recorded by hand, and can also be edited, or modify lines and patterns. In the actual use process, people gradually find that with the difference in the user's writing habits and the way of holding the pen, as well as different writing directions, the stylus written on paper The lines or graphics are not exactly the same as the lines and graphics displayed on the computer screen, and often the size and ratio do not correspond. This kind of graphic variation problem affects the popularization and application of handwriting equipment in modification or drawing

The reason for this problem is that there are errors in the x and y coordinate values ​​when the existing stylus motion trajectory is converted into x and y coordinates, such as figure 1 As shown, when the stylus P is inclined when writing on the board, the tip of the pen is at point P0. During the writing process, the angle of holding the pen will continuously shift with the writing habit, such as the pen shifts to the P' position, The tip of the pen becomes point P1, that is, the resulting displacement is △P=P1-P0 or P1+P0, but the ultrasonic generator A is still at the same position above the tip of the pen, because the position of the stylus detected by the ultrasonic detectors A and B is only The position of the ultrasonic generator A is not the position of the tip of the stylus. Therefore, when the tip of the stylus is displaced by △P, the displacement value of the ultrasonic generator A → 0 or equal to 0. When this error value is displayed on the computer screen, a graph will be generated. Variation, because the writing with the pen varies from person to person, so the form of graphic distortion is different, but the solution is the same, that is, to accurately determine the x and y coordinates of the movement of the stylus tip to solve the problem of graphic distortion

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