Single Camera Touch Display Trajectory Recognition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electronic blackboards face issues with increased manufacturing costs, large size, and delayed touch trajectory display due to the use of multiple cameras and limitations in recognizing multiple touch pens and trajectories.
Innovation Solution
A display apparatus with a touch display, a camera, and a processor that captures images, identifies object positions and properties, and controls the display to show touch trajectories based on the identified information, minimizing delays and costs by recognizing touch pens in advance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple cameras are used to recognize touch pens and display trajectories, then the recognition accuracy and functionality are improved, but the manufacturing cost increases
Solution Approach 1:
The patent extracts only the essential function of camera-based touch pen recognition by using a single camera positioned at the back of the display. This eliminates the need for multiple cameras while maintaining the ability to identify touch pens and display corresponding trajectories, thus reducing manufacturing cost without sacrificing core functionality.
Solution Approach 2:
The single camera positioned at the back of the display serves multiple functions: it captures images for touch pen recognition, determines touch trajectory colors, and enables trajectory display. This multi-functional use of a single camera replaces what would traditionally require multiple specialized components, reducing cost while maintaining comprehensive functionality.
2Ease of manufacture
If a camera is positioned apart from the front surface to capture touch pens, then the manufacturing cost is reduced, but the size of the electronic blackboard becomes large and user positioning becomes difficult
Solution Approach 1:
Instead of positioning the camera in front of the display (third dimension relative to the user), the patent places the camera at the back of the display, using the opposite dimension. This allows the camera to capture touch pen information without increasing the front-facing depth or requiring users to position themselves in specific locations, effectively reducing the perceived size and improving usability.
3Device complexity
If touch pen color is sensed through a camera only after touch input is made, then the system simplicity is maintained, but a delay occurs in displaying the touch trajectory
Solution Approach 1:
The system continuously captures images through the camera positioned at the back of the display, even before touch input occurs. This preliminary image capture allows the system to pre-identify touch pen colors and positions. When touch input is detected, the pre-captured image data is immediately processed to determine trajectory colors, eliminating delay while maintaining system simplicity.
Data Source
AI summary
A display apparatus is disclosed. The display apparatus includes a touch display, a camera, and a processor configured to control the camera to capture an image including the touch display, based on an object being identified from an image captured through the camera, obtain a first position of the object on the touch display based on the image, identify whether the first position is within a predetermined distance from a second position where the touch input is sensed based on a touch input of the object being sensed on the touch display, and based on the first position being within the predetermined distance from the second position, control the touch display to display a touch trajectory corresponding to the touch input based on the identified object.