Dynamic Erasing Region for Electronic Whiteboard
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Solution Overview
Problem
Current methods for erasing handwriting on electronic whiteboards are inefficient, as they fail to recognize the erasing mode accurately and allow for fixed, uncontrolled erasing regions, leading to incomplete deletion of handwriting due to variations in touch point gestures and fixed erasing area sizes.
Innovation Solution
A method and apparatus that enable an erasing mode by detecting a preset number of contact points, calculate a dynamic erasing region using a convex hull algorithm, and delete handwriting data by determining intersections with a convex polygon, allowing for customizable and stable erasing regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the erasing mode is recognized based on touch points formed by four fingers held together or a fist, then the erasing mode can be activated, but the quantity of touch points is not greater than 4 or 5 respectively, causing the device to fail to enter erasing mode
Solution Approach 1:
The patent changes the recognition parameter from fixed gesture patterns (four fingers or fist) to a flexible threshold-based touch point quantity (greater than 2). This allows the system to recognize erasing gestures regardless of the specific number of fingers used, resolving the contradiction between ease of operation and measurement precision.
2Ease of operation
If the erasing region size is determined according to the area formed by four fingers held together or a fist, then the erasing mode can be activated, but the size of the erasing region is fixed and cannot be controlled dynamically
Solution Approach 1:
The patent makes the erasing region dynamic by calculating it based on the actual touch points during the erasing gesture. The region expands or contracts according to the user's finger movement, allowing flexible control of the erasing area size while maintaining ease of operation.
Solution Approach 2:
The patent creates a universal erasing mechanism that works with any number of fingers (not limited to four fingers or fist). The system adapts to different user gestures and automatically adjusts the erasing region, providing versatility in both activation methods and region control.
3Productivity
If touch points are uploaded at a certain frequency, then the touch screen can process data, but when touch points move rapidly, the touch screen cannot upload all touch points, causing handwriting in partial regions to cannot be deleted
Solution Approach 1:
The patent performs preliminary actions by continuously tracking and recording all touch point positions during the erasing gesture, not just relying on periodically uploaded data. This ensures that even if some touch points are missed during rapid movement, the complete erasing region can still be reconstructed from the accumulated data.
Data Source
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AI summary
The present disclosure discloses a method for erasing handwriting on an electronic whiteboard, including: obtaining first contact points; enabling an erasing mode when a quantity of the first contact points is greater than a preset value; obtaining second contact points in the erasing mode, and calculating an erasing region according to the first contact points and the second contact points; and deleting handwriting data in the erasing region. A method, an apparatus and a device for erasing handwriting on an electronic whiteboard provided by the present disclosure can enter an erasing mode rapidly and erase handwriting effectively, thus improving the practicability of the electronic whiteboard.