Interactive Projector Multi-Angle Detection Light Irradiation
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Solution Overview
Problem
Existing interactive projectors face challenges in achieving sufficient contrast between pointing elements and projected screens, which hinders accurate detection of pointing element positions, especially due to variations in detection light application methods.
Innovation Solution
The interactive projector employs multiple detection light irradiation sections with different emission patterns and angles to ensure high contrast between the pointing element and the projected screen, using time-multiplexed detection light emission and strategic placement of these sections to enhance detection accuracy across the screen area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single detection light irradiation section is used, then the device structure is simple, but the contrast between pointing element and projected screen is insufficient at certain positions
Solution Approach 1:
The detection light irradiation section is divided into multiple independent light emitting units arranged at different positions and angles. Each unit independently irradiates the projected screen from a specific direction, enabling multi-angle detection coverage that ensures sufficient contrast at all screen positions.
Solution Approach 2:
Multiple detection light irradiation sections are arranged in three-dimensional space with different positions and emission angles relative to the projected screen. This spatial distribution creates multi-dimensional detection coverage, ensuring that at least one light source provides adequate contrast regardless of the pointing element's position on the screen.
2Ease of operation
If detection light is emitted from a single position, then the system is simple to control, but the contrast ratio varies and becomes insufficient in certain areas
Solution Approach 1:
Multiple detection light irradiation sections are combined to work together as an integrated detection system. The light emitting units operate in coordination, with their individual contributions merging to provide comprehensive coverage. This ensures that the pointing element receives detection light from multiple angles, maintaining consistent contrast ratios across the entire projected screen area.
Solution Approach 2:
The system dynamically selects and activates specific detection light irradiation sections based on the detected position of the pointing element. When the pointing element is detected in a specific area, the control section activates the corresponding light emitting units to optimize contrast for that region, while maintaining overall system reliability.
3Measurement precision
If multiple detection light irradiation sections are used, then the contrast and detection accuracy are improved, but the device complexity increases
Solution Approach 1:
Each detection light irradiation section is designed with universal functionality to irradiate the entire projected screen area, rather than being specialized for specific zones. This multi-functional design allows any light emitting unit to contribute to detection across the full screen, reducing the need for complex specialized components while maintaining high detection precision.
Solution Approach 2:
The control section automatically manages the operation of multiple detection light irradiation sections based on real-time detection data. The system self-regulates which light emitting units are active and at what intensity levels, eliminating the need for manual configuration or complex external control mechanisms while maintaining optimal detection accuracy.
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
This configuration allows for reliable detection of pointing element positions at any location on the projected screen, even in areas where traditional methods fail, by ensuring that at least one contrast value exceeds a set threshold, thereby improving user interaction and input accuracy.
Implementation Method 1
the pointing element is irradiated with detection light such as an infrared ray, and the detection light reflected by the pointing element is imaged by the camera
Data Source
AI summary
An interactive projector includes a projection section, a first detection light irradiation section and a second detection light irradiation section, an imaging section, and a position detection section adapted to detect a position of the pointing element based on an image, which is taken by the imaging section and includes the pointing element. The first and second detection light irradiation sections are disposed so that at least one of the following (i) and (ii) becomes higher than a threshold value: (i) a first contrast between the pointing element in a first image in a case in which the detection light is emitted only from the first detection light irradiation section and the projected screen, and (ii) a second contrast between the pointing element in a second image in a case in which the detection light is emitted only from the second detection light irradiation section and the projected screen.