AR Projector Calibration Using Distance Sensor Feedback
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Solution Overview
Problem
Conventional projectors are difficult to move and can only project images at a fixed position, leading to issues with maximum projection range, especially in wide-area displays or interactive applications like video games.
Innovation Solution
A projection method and system that uses a projector with a distance sensor and processor to establish a projection map of an environmental space, identify feature points, update the projection map, and calibrate the projection surface to compensate for distortions, allowing for dynamic image projection and interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional projectors are used for fixed position projection, then the projection system is simple and stable, but the projection range is limited and cannot cover wide-area display surfaces
Solution Approach 1:
The patent applies dynamics by enabling the projector to move from a fixed position to a movable platform (such as a drone or robot). This allows the projection range to expand dynamically while the system adapts its position and orientation in real-time to maintain proper projection geometry on wide-area surfaces.
Solution Approach 2:
The patent implements universality by creating a projection system that can operate in multiple modes: fixed position projection, movable projection, and multi-projector coordinated projection. This multi-functional approach allows the same system architecture to handle both simple fixed projections and complex wide-area dynamic projections.
2Area of stationary object
If multiple projectors are introduced for stitching images to extend projection range, then the projection area is improved, but the device complexity and difficulty of alignment increase
Solution Approach 1:
The patent applies feedback by implementing real-time detection and adjustment mechanisms for multi-projector systems. Sensors detect the positions and orientations of multiple projectors, and the system automatically adjusts projection parameters to ensure proper alignment and stitching, reducing the complexity of manual configuration.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing projection mapping parameters for different projector configurations. Before actual projection, the system performs preliminary alignment and calibration, storing the results for quick deployment, which simplifies the operation of multi-projector systems.
3Ease of operation
If a micro-projector is made portable for user interaction, then the ease of operation is improved, but the projection stability and image quality may deteriorate
Solution Approach 1:
The patent applies mechanics substitution by replacing mechanical stabilization systems with computational methods. Instead of using complex mechanical gimbals or stabilization mechanisms, the system uses image processing algorithms and real-time rendering to compensate for movement and maintain stable projections from portable micro-projectors.
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 the projection of images over a wider area and on non-flat surfaces, providing real-time image correction and enhancing user interaction in augmented reality applications.
Implementation Method 1
a distance sensor configured to detect at least one focal length between the projector and the projection surface
Data Source
AI summary
A projection method includes establishing a projection map of an environmental space according to at least one displacement vector and at least one deflection angle of a projector, identifying at least one feature position point in the environmental space by using a distance sensor, updating the projection map for generating a projection feature map according to the at least one feature position point, and calibrating a projection surface projected by the projector for compensating distortions of the projection surface.