Position Detection Using Temporal Light Discrimination
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Solution Overview
Problem
Existing position detection systems face challenges in accurately detecting indication positions of different kinds of indicators, especially when the light does not evenly reach all locations in the detection area, leading to reduced detection accuracy and the need for multiple sensors, which increases apparatus size.
Innovation Solution
A position detection system that includes a light emitting apparatus and a position detection apparatus with an imaging portion to capture images and detect light emission timings, allowing for the discrimination and detection of indication positions based on the light generated by or reflected from indicators, even with a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are provided to detect indication positions of different kinds of indicators, then detection accuracy is improved, but the size of the apparatus configuration increases
Solution Approach 1:
The imaging portion is designed to perform multiple detection functions simultaneously. By capturing images in different time periods and analyzing light emission timings, the single imaging portion can detect indication positions of both the first indicator (self-luminous) and the second indicator (reflective), eliminating the need for separate sensor units for different indicator types.
Solution Approach 2:
The system uses periodic light emission from the light emitting apparatus at specific time periods to enable temporal separation of detection signals. The first indicator emits light at different timings than the second indicator, allowing the imaging portion to distinguish between them by capturing images at different time periods and analyzing the timing characteristics.
2Device complexity
If a simple configuration is used for position detection, then device complexity is reduced, but detection accuracy for different kinds of indicators deteriorates
Solution Approach 1:
The system introduces the time dimension as an additional parameter for differentiation. Instead of using spatial separation with multiple sensors, the imaging portion captures images at different time periods and uses the temporal dimension (light emission timings) to distinguish between different kinds of indicators, maintaining simple spatial configuration while achieving accurate detection.
Solution Approach 2:
The imaging portion serves as an intermediary that captures optical information from both indicator types and converts it into distinguishable data through temporal analysis. By mediating between the light emitting apparatus and the detection system, it enables differentiation of indicator kinds through timing analysis without requiring complex separate detection paths.
3Measurement precision
If light emission timings are used to discriminate indicators, then detection accuracy is improved, but the complexity of detecting and measuring increases
Solution Approach 1:
The system performs preliminary synchronization by having the light emitting apparatus emit light at predetermined time periods before image capture. This preliminary light emission creates a temporal reference framework that simplifies subsequent detection, as the imaging portion can directly compare the timing of received light against the known emission schedule to identify indicator types and their positions.
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
Enables accurate detection of indication positions for different kinds of indicators using captured image data, simplifying the system configuration and allowing for precise identification without the need for multiple sensors.
Implementation Method 1
detects at least one of an image of light generated by a first indicator of the indicators and an image of the detection light reflected on a second indicator of the indicators
Implementation Method 2
an image of the detection light reflected on a second indicator of the indicators
Data Source
AI summary
A projection system includes a light emitting apparatus that emits detection light to a detection area for detecting indication positions of indicators, and a projector that detects the indication positions of the indicators in the detection area. The projector includes an imaging portion that captures an image of the detection area, and a position detection portion that detects at least one of an image of light generated by the indicator and an image of the detection light reflected on the indicator from data of a captured image of the imaging portion, and discriminates and detects the indication positions of the indicator and the indicator based on light emission timings of the indicator and the light emitting apparatus.