Projection System Shape Measurement via Invisible Light
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Solution Overview
Problem
Existing projection systems lack the ability to project images that accurately fit the shape of an object while simultaneously measuring the object's shape with high precision, leading to inaccuracies in image alignment and object representation.
Innovation Solution
A projection system comprising an invisible light projector, a background member with a light shielding surface, an imaging unit, and a visible light projector, which projects invisible light patterns onto the object, captures these patterns, and generates image data to project image content that follows the object's shape, ensuring precise alignment and measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a projection system uses visible light only for projection mapping, then the system is simple, but it cannot measure the shape of the object with high precision
Solution Approach 1:
The system separates the projection function into two independent subsystems: an invisible light projector for shape measurement and a visible light projector for image projection. This segmentation allows each subsystem to be optimized for its specific function, enabling high-precision shape measurement while maintaining clear image projection
Solution Approach 2:
The patent introduces an invisible light (such as infrared light) as an intermediary to bridge the gap between the object's physical shape and the projection system's measurement capability. This intermediary light enables precise shape measurement without interfering with the visible light projection, thus resolving the contradiction between measurement precision and system complexity
2Measurement precision
If the background member diffusely reflects invisible light, then the imaging is easier, but the shape measurement precision decreases
Solution Approach 1:
The background member is designed with different optical properties for different wavelengths: it has high diffuse reflectivity for visible light to facilitate imaging, but low diffuse reflectivity (high absorptivity) for invisible light to enable precise shape measurement. This local quality differentiation resolves the contradiction between ease of imaging and measurement precision
3Measurement precision
If the projection system uses invisible light for shape measurement, then measurement precision improves, but the system complexity increases due to multiple projectors
Solution Approach 1:
The patent combines the invisible light projector and visible light projector into a single integrated projection system that shares common control and processing units. This merging approach allows the system to perform both shape measurement and image projection functions while reducing overall system complexity through resource sharing
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 that accurately fit the object's shape and measures the object's shape with high precision, improving image alignment and enhancing the accuracy of object representation.
Implementation Method 1
The invisible light projector projects a predetermined invisible light image onto the object via invisible light. The imaging unit captures an image of the invisible light projected from the invisible light projector.
Implementation Method 2
The background member has a light shielding surface that does not diffusely reflect the invisible light incident thereon.
Implementation Method 3
The visible light projector projects the image content shown by the image data onto the object via visible light.
Data Source
AI summary
A projection system includes an invisible light projector, a background member, an imaging unit, an image generator, and a visible light projector. The invisible light projector projects a predetermined invisible light image onto the object via invisible light. The background member is disposed behind the object in a direction of the invisible light emitted from the invisible light projector. The imaging unit captures an image of the invisible light projected from the invisible light projector. The image generator measures a shape of the object based on the image captured by the imaging unit to generate image data showing image content for projection onto the object in accordance with the measured shape. The visible light projector projects the image content shown by the image data onto the object via visible light. The background member has a light shielding surface that does not diffusely reflect the invisible light incident thereon.