3D Projection Mapping Calibration for Undistorted Building Surfaces
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Solution Overview
Problem
Existing methods for projecting images onto real objects are labor-intensive and require numerous iterations to adjust projector positions due to inaccuracies in virtual 3D model transfers and calibration, limiting installation locations and failing to avoid undesirable lighting areas.
Innovation Solution
Creating a three-dimensional digital model of the object and its spatial environment with actual coordinates, performing post-field processing to determine optimal projector locations, and generating undistorted projections using software tools like ContextCapture and ZEMAX to reduce labor intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If virtual 3D model transfer and calibration methods are used to determine projector positions, then projection accuracy can be achieved, but the process requires numerous iterations and adjustments on-site, significantly increasing labor intensity and time consumption
Solution Approach 1:
The patent applies preliminary action by performing comprehensive virtual calibration and position optimization in the digital model before actual projector installation. The system calculates optimal projector positions and projection parameters in advance, so that when projectors are installed on-site, they can be directly positioned at the pre-determined optimal locations without requiring multiple iterations of adjustment, thus resolving the contradiction between achieving high precision and reducing time consumption.
Solution Approach 2:
The patent uses copying by creating a detailed virtual 3D model that replicates the real-world environment, including all geometric features and lighting conditions. This digital copy allows for complete calibration and optimization to be performed virtually, transferring the calibrated parameters directly to the physical projectors, thereby eliminating the need for repeated on-site adjustments while maintaining high projection accuracy.
2Adaptability or versatility
If traditional projector installation methods are used, then projectors can be positioned flexibly, but they cannot avoid projecting light onto undesirable areas such as windows, galleries, and apertures
Solution Approach 1:
The patent applies preliminary action by performing light path analysis and obstacle detection in the virtual 3D model before projector installation. The system identifies areas that should not be illuminated (windows, galleries, apertures) and calculates projector positions that avoid these areas in advance. This allows projectors to be installed with flexibility while ensuring they do not project light onto undesirable areas, resolving the contradiction between installation flexibility and avoiding harmful lighting effects.
3Area of stationary object
If digital projectors are installed in open spaces for architectural illumination, then project coverage is maximized, but projectors are exposed to weather conditions requiring additional protective measures
Solution Approach 1:
The patent applies preliminary action by analyzing the installation environment in the virtual 3D model to identify locations that provide both wide coverage and natural protection from weather elements. The system evaluates potential installation positions considering factors such as building overhangs, alcoves, and other structures that can shield projectors from rain and extreme temperatures, allowing projectors to be installed in open spaces with maximum coverage while utilizing existing architectural features for weather protection.
Data Source
AI summary
The invention relates to a method for creating undistorted projections onto the surfaces of real-world objects in the case of the artistic illumination of architectural buildings, structures and similar objects, as well as in the case of light marking at industrial facilities and on civilian objects. Said method includes performing geodetic measurements of an object and its spatial surroundings to create a vertical control network, performing a photographic survey or laser scanning of the real-world object onto which a projection is to be made and of objects in the spatial surroundings thereof, creating a 3D model of the real-world object, referencing the real-world object to a given system of coordinates during a rendering process, determining and calculating a projection zone, calculating the position of projectors, taking into account the location of objects in the spatial surroundings which would obstruct the path of projection beams from the projectors to the object onto which a projection is to be made, creating a model of a "source (projectors) - screen" system using the coordinates obtained in the 3D modelling process, transferring a projection image onto a gobo slide, installing projectors in accordance with the coordinates of virtual projectors in the 3D model of the real-world object, placing the slide with the image into a projector and projecting the image onto the surface of real-world objects.