Media Projector Calibration via Photogrammetric 3D Pose Detection
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Solution Overview
Problem
Media projection devices, such as robotic lights and video projectors, face challenges in accurately determining and adjusting their 3D position and orientation, especially in touring installations with varying venue structures, leading to discrepancies in projection geometry and appearance.
Innovation Solution
A system utilizing photogrammetric measurement, projection media pose determination, calibration algorithms, and a controller to automatically calibrate and control media projectors in real-time, allowing for precise 3D positioning and orientation adjustments, enabling accurate projection alignment and media characteristics control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration methods are used for media projection devices, then setup time is reduced for small numbers of devices, but calibration accuracy deteriorates and the process becomes impractical for large numbers of devices
Solution Approach 1:
The patent replaces manual mechanical calibration processes with an automated optical measurement system. Cameras capture images of projection patterns, and computer vision algorithms automatically calculate 3D positions and orientations of multiple media projection devices, eliminating the need for time-consuming manual measurement and calibration for each device
Solution Approach 2:
The system uses cameras to create optical copies (images) of the projection patterns and measurement targets. These visual copies are then processed through image processing algorithms to extract precise positional and orientational data, enabling accurate calibration without direct physical measurement
2Area of stationary object
If the number of media projection devices is increased to cover larger venues, then coverage area is improved, but calibration complexity and time requirements increase significantly
Solution Approach 1:
The patent implements a universal calibration system where a single camera setup can calibrate any number of media projection devices simultaneously. The system uses standardized measurement targets and automated image processing that works consistently across venues of different sizes, allowing the same methodology to scale from small to large coverage areas without increasing procedural complexity
Solution Approach 2:
By replacing manual calibration procedures with automated computer vision-based measurement, the system can handle large numbers of devices efficiently. The automated image processing and 3D reconstruction algorithms process multiple devices in parallel, preventing calibration complexity from scaling linearly with the number of devices
3Adaptability or versatility
If mounting locations of media projection devices vary due to venue differences, then adaptability to different venues is improved, but projection geometry accuracy deteriorates
Solution Approach 1:
The system captures actual projection patterns and measurement target images during setup, then uses these feedback images to calculate the true 3D positions and orientations of the devices. This feedback loop allows the system to compensate for any mounting location variations and achieve accurate projection geometry specific to each venue's unique configuration
Solution Approach 2:
The calibration system is designed to adapt dynamically to different mounting configurations. Rather than requiring fixed, pre-determined mounting positions, the system measures the actual positions and orientations of devices wherever they are mounted, then uses this measured data to calculate accurate projection parameters for that specific configuration
4Speed
If real-time control of media projection devices is implemented, then responsiveness to dynamic events is improved, but system complexity and computational requirements increase
Solution Approach 1:
The system performs preliminary calibration during setup, establishing the 3D positions, orientations, and projection parameters of all media projection devices before the event begins. This pre-computed calibration data is stored and used during real-time operation, allowing fast response to dynamic events without requiring complex real-time calculations for each control decision
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 rapid and accurate calibration of multiple media projection devices, ensuring that the projected media conforms closely to the original design, even in dynamic environments, by using computer vision and real-time computing to adjust position, orientation, and media characteristics.
Implementation Method 1
A system utilizing photogrammetric measurement, projection media pose determination, calibration algorithms, and a controller to automatically calibrate and control media projectors in real-time
Data Source
AI summary
A method of controlling media projectors includes providing at least one electromagnetic detector having a field of view directed toward a three dimensional space, and photogrammetrically characterizing at least a portion of the field of view. There is provided at least one media projector that projects at least an electromagnetic signal and a projection controller that moves one or more media projectors in at least two dimensions. At least three measurement locations are obtained within the at least a portion of the field of view by moving the media projector in at least two dimensions. The at least one electromagnetic detector is used to detect the measurement locations within the three dimensional space using the electromagnetic detector to obtain photogrammetric data. The projection controller is calibrated based on the photogrammetric data.