Interactive Board Erasing Using Touch Shape and Rotation Analysis
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Solution Overview
Problem
Current non-high-precision touch frames in interactive boards struggle to accurately determine the type of stylus used, ensure consistent touch areas, differentiate between a stylus and a finger or eraser, and maximize the use of touch point information for effective handwriting erasing.
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 analyze and match the touch object's geometry shape, enabling precise erasing of handwriting based on acquired touch point data.
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 transforms the touch point information parameters from simple coordinates to include additional attributes such as touch area, touch shape, and touch pressure. By enriching the parameter set of touch point information, the system achieves higher measurement precision without necessarily requiring a more complex touch frame hardware structure.
2Device complexity
If touch point information is not fully utilized, then device complexity is reduced, but productivity of handwriting erasing deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors touch point information during the erasing process and dynamically adjusts the erasing geometry shape and size based on the real-time touch object characteristics. This feedback loop enables the system to maximize the use of available touch point information, significantly improving handwriting erasing efficiency.
Solution Approach 2:
The patent introduces dynamic adaptation in the erasing process by allowing the erasing geometry to change based on the detected touch object properties. The system dynamically determines the appropriate erasing shape (circle, rectangle, irregular) and dimensions based on the real-time touch point information, making the erasing process more efficient and accurate.
3Device complexity
If touch object type is not accurately determined, then device complexity is reduced, but reliability of erasing operation deteriorates
Solution Approach 1:
The patent applies local quality analysis by examining specific local characteristics of the touch point information such as touch area distribution, touch pressure variations, and touch movement patterns. By analyzing these local properties, the system can reliably determine the type of touch object (finger, stylus, eraser) without requiring complex global recognition systems.
Data Source
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.