Interactive Board Handwriting Erasing Using Touch Geometry Matching
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Solution Overview
Problem
Current non-high-precision touch frames in interactive boards struggle to accurately determine the type of stylus, ensure consistent touch area, and effectively erase handwriting due to limited utilization of touch point information.
Innovation Solution
A method and device for erasing handwriting that utilizes a high-precision touch frame to acquire and process touch point information, including coordinates, height, width, and rotation angle, to determine an erasing geometry shape matching the touch object, enabling precise erasure of handwriting based on touch point analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If non-high-precision touch frames are used, then device complexity is reduced, but measurement precision of touch point information deteriorates
Solution Approach 1:
The patent changes the parameter utilization approach by transforming raw touch point data into normalized geometric parameters (touch area, rotation angle, position) that can be effectively used for erasing operations. This allows non-high-precision touch frames to provide sufficient information for the intended erasing function through software-based parameter processing rather than hardware enhancement.
2Device complexity
If touch point information is not fully processed, then device complexity is reduced, but erasing precision deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-processing touch point information to extract key geometric parameters (touch area, rotation angle, position) before the erasing operation. This preliminary extraction and normalization of parameters enables precise erasing without requiring complex real-time processing during the erasing action itself.
Solution Approach 2:
The patent replaces complex hardware-based precision mechanisms with software-based parameter processing. Instead of relying on high-precision hardware to directly achieve precise erasing, the system uses software algorithms to process touch point information and generate appropriate erasing commands, substituting mechanical precision with computational intelligence.
3Measurement precision
If touch object type is not accurately determined, then measurement precision is reduced, but erasing effectiveness deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring touch point information characteristics (touch area size, shape, movement pattern) to identify and adapt to different touch object types. This feedback mechanism allows the system to recognize whether a stylus, finger, or eraser is being used and adjust the erasing operation accordingly, ensuring reliable erasing effectiveness.
Data Source
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Figure 1b~1c
Figure 2~2a
AI summary
A touch frame equipped on the interactive board has a touch response precision within a set precision range, including displaying, using a display screen, a display interface containing handwriting to be erased; receiving a handwriting erasing instruction and entering into a handwriting erasing mode, and the handwriting erasing instruction is generated by a user touch action; acquiring touch point information fed back through the touch frame when a touch object touches a surface of the display screen and moves on the surface, and the touch object is manipulated by the user; erasing the handwriting to be erased in the interface along an erasing geometry shape matching the touch object based on an analysis of the acquired touch point information and the handwriting to be erased. Through this method, it can ensure that the erasing response for the handwriting to be erased in the interface can better match the erasing geometry shape of the touch object used by the user, so that the flexible adjustment of the erasing region during the erasing process is realized, thereby improving the erasing efficiency on the interactive board.