Mobile Projector Positioning via Intermediary Sensors
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Solution Overview
Problem
Existing projector systems face challenges in precisely detecting the posture and distance of a projector relative to a projection plane, leading to difficulties in projecting images accurately, especially with mobile projectors that experience volatile movements or uneven surfaces.
Innovation Solution
A projector system comprising mobile projectors, position sensors, and a controller that detects the positional relationship between the projector and the projection area, allowing for real-time adjustment of the projected image to ensure accurate alignment and correction for distortions caused by surface irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If direction sensor or acceleration sensor is used to detect projector posture, then the projector can be made mobile and portable, but the detection precision of projector posture and distance deteriorates
Solution Approach 1:
The patent introduces an intermediary detection system consisting of multiple position sensors arranged in the projection space that detect the projector's position indirectly through emitted light or signals, rather than relying on sensors mounted on the projector itself. This intermediary detection method enables precise position and posture detection while maintaining projector mobility.
Solution Approach 2:
The patent replaces mechanical sensors (direction sensor, acceleration sensor) mounted on the projector with an optical/electromagnetic field-based detection system using multiple position sensors in the environment. This substitution eliminates the need for complex onboard sensing while achieving higher measurement precision through geometric calculation from multiple detection points.
2Manufacturing precision
If display image is read by CCD for image analysis, then image optimization can be achieved, but the time required for focus control and image analysis increases
Solution Approach 1:
The patent performs preliminary detection of the projector's position and posture using the position sensor system before projection begins. By pre-calculating the optimal projection parameters based on detected position information, the system eliminates the need for time-consuming focus control and image analysis during actual projection, thereby reducing time loss while maintaining image quality.
3Measurement precision
If reference point detection method is used for positioning, then positioning can be achieved, but the display surface is restricted to limited places where reference point can be detected
Solution Approach 1:
The patent creates a universal positioning system using multiple position sensors distributed throughout the projection space that can detect projector position regardless of the projection surface characteristics. This multi-functional detection system works on various surfaces (walls, ceilings, floors, uneven surfaces) without requiring specific reference points, thereby enhancing adaptability while maintaining positioning accuracy through geometric calculation.
Data Source
AI summary
A projector system is provided with at least one projector mobile in a specified space and adapted to project a video to a projection area included in the specified space in accordance with inputted video information, a plurality of position sensors each including a position detecting section for detecting a positional relationship of the projector with the projection area and arranged in a specified positional relationship with the specified space, and a controller for controlling a video to be projected from the projector to the projection area based on detection results by the position detecting sections of the plurality of position sensors.