Video Projector Calibration for Digital Design Model Projection
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Solution Overview
Problem
Current methods for projecting virtual data from digital design models onto large objects during construction, assembly, or maintenance are complex, inflexible, time-consuming to calibrate, and limited in information display, often leading to positioning errors and inefficiencies in operations like fitting and quality control.
Innovation Solution
A method and device using a video projector and at least two image-capturing devices to calibrate and project information from a digital design model onto a surface of interest, eliminating the need for precise marker placement and allowing continuous calibration and vibration compensation, enabling precise three-dimensional projection and mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If laser marking systems are used to project information onto the surface, then information can be displayed during assembly operations, but the device complexity increases and the amount of information that can be displayed is limited due to inherent limitations of laser projection
Solution Approach 1:
The patent uses a video projector to project images captured by a video camera onto the surface, creating a visual copy of the captured scene. This allows complex information to be displayed without requiring complex laser projection systems, as the projector simply reproduces the camera's visual output onto the target surface.
Solution Approach 2:
The patent replaces the mechanical laser projection system with an optical video projection system. Instead of using laser beams to display information, the system uses a video camera to capture the scene and a video projector to display it, substituting a more flexible optical system for the rigid mechanical laser system.
2Measurement precision
If metrological emitters and receivers are positioned on the surface and projectors to enable information projection, then position and orientation can be ascertained, but the calibration system becomes time-consuming due to the need to position various metrological emitters and receivers
Solution Approach 1:
The patent extracts the calibration markers from the physical object and places them only on the video projector. This eliminates the need to position multiple metrological emitters and receivers on the surface, reducing calibration time while maintaining measurement precision through the projector's known position and the camera's visual capture.
Solution Approach 2:
The patent performs preliminary calibration by positioning markers on the projector before the actual measurement process. This preliminary setup establishes the reference frame needed for accurate position and orientation determination, eliminating the need for time-consuming calibration during the actual operation.
3Device complexity
If video projector and single video camera are used for projection, then the system can be implemented with fewer components, but the implementation becomes difficult and time-consuming because it requires markers to be positioned beforehand in precise positions on the surface of interest
Solution Approach 1:
The patent inverts the traditional approach by placing markers on the projector rather than on the surface. Instead of requiring precise marker positioning on the target surface, the system uses markers on the projector as a reference, making implementation easier as the projector's position is already controlled and stable.
4Ease of operation
If conventional measuring means and paper plans are used by operators, then basic measurement tasks can be performed, but the process becomes time-consuming and errors may occur such as positioning errors, damage, incorrect references
Solution Approach 1:
The patent uses a video camera to capture the surface and project the captured image back onto it, providing visual feedback to the operator. This feedback mechanism allows operators to see exactly where they are measuring and comparing against the projected reference, eliminating positioning errors and improving accuracy without requiring complex manual measurement procedures.
Data Source
AI summary
A method for projecting information issued from a digital design model. Calibration is performed by acquiring characteristic data originating from a surface of interest and comparing the characteristic data with virtual data issued from the digital design model. A spatial position of a projecting device is determined. The projecting device comprises a video projector and at least two separate image-capturing devices. Depending on the spatial position, information issued from the digital design model is projected by the video projector onto the surface of interest.