Optical Touch Positioning Using Multi-Angle Image Comparison
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Solution Overview
Problem
Existing optical touch systems face inaccuracies in determining touch positions, particularly near boundaries, due to limitations in calibration methods that rely on subtracting theoretical from actual coordinates without sufficient precision in specific application scenarios.
Innovation Solution
An optical touch apparatus and method that utilize a touch operation surface with reference points and optical sensors to obtain images from different angles, determining orientation points and comparing them to reference points to accurately calculate the touch position, thereby improving determination accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a calibration mode is used to subtract actual coordinate from theoretical coordinate, then the touch position can be determined in most areas, but the touch position accuracy near boundaries cannot be improved
Solution Approach 1:
The patent transitions from 2D image analysis to 3D spatial analysis by introducing depth information through time-of-flight measurement. The controller calculates actual position based on flight time of light signals and compares it with theoretical position, enabling accurate boundary detection that overcomes the limitations of traditional 2D calibration methods
Solution Approach 2:
The patent introduces a light signal as an intermediary to transfer information about the touch object's position and orientation. By measuring the flight time of light signals reflected from different parts of the touch object, the system obtains precise spatial information that serves as a mediator between the touch object and the detection system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of touch position determination by comparing orientation points to reference points, allowing for precise calculation and adjustment of coordinates, addressing the limitations of existing calibration methods.
Implementation Method 1
the light signal transmitted from the optical touch stylus to the optical sensors may be actively generated from the internal of the optical touch stylus, or generated by the optical touch stylus reflecting back the light signal transmitted by a light source attached to each optical sensor
Implementation Method 2
A blocking optical touch system is based on the principle of signal blocking that a touch object blocks a light signal emitted from a light source
Data Source
AI summary
An optical touch apparatus configured to sense a touch operation of a touch object is provided. The optical touch apparatus includes a touch operation surface, a plurality of optical sensors and a touch controller. The touch operation surface includes a plurality of reference points. The touch object performs the touch operation on the touch operation surface. The optical sensors are disposed on a side of the touch operation surface and configured to obtain a plurality of images from different angles. The touch controller is electrically connected to the optical sensors and configured to determine a plurality of orientation points according to the images obtained by the optical sensors. The touch controller compares the orientation points to the reference points and determines a touch position of the touch object on the touch operation surface according to a comparison result. Furthermore, a method for determining a touch position is also provided.