Phosphorescent Motion Capture via Strobed Fluorescent Lamps
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Solution Overview
Problem
Traditional motion capture systems face challenges in accurately capturing human and animal motion due to limitations in marker-based tracking systems, which can be distracting for performers and fail to separate motion data from normal illumination artifacts.
Innovation Solution
The use of phosphorescent makeup or paint combined with synchronized light panels and cameras, where the light panels strobe on and off to charge the phosphorescent material, allowing cameras to capture images during the dark intervals when the phosphorescent material emits light, thereby improving data separation and reducing distractions for performers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional retro-reflective markers are used in motion capture systems, then motion tracking is enabled, but the markers are distracting for performers and fail to separate motion data from normal illumination artifacts
Solution Approach 1:
The patent applies phosphorescent materials that emit light in specific color ranges (e.g., green, yellow-green) when excited by UV or blue light. This allows the motion capture markers to be visually distinct from the natural skin tones and clothing colors, reducing distraction while improving detectability. The phosphorescent markers glow with characteristic colors that are easily distinguishable from ambient lighting conditions.
Solution Approach 2:
The system uses periodic strobing of UV or blue light sources to excite the phosphorescent markers at specific intervals. During the dark periods between strobes, the phosphorescent markers continue to emit light, creating a periodic emission pattern that is distinct from continuous ambient lighting. This temporal modulation allows cameras to capture motion data separated from normal illumination artifacts.
2Measurement precision
If traditional retro-reflective markers with continuous lighting are used, then motion capture data can be collected, but it is difficult to separate motion data from normal illumination artifacts
Solution Approach 1:
The system employs periodic strobing of excitation light sources (UV or blue LEDs) to activate phosphorescent markers only during specific time intervals. Between these strobes, the excitation light is off, allowing the phosphorescent markers to emit their characteristic light without interference from continuous ambient illumination. This temporal separation enables cameras to capture clean motion data distinct from normal lighting conditions.
Solution Approach 2:
The phosphorescent markers emit light at specific wavelengths (e.g., green 530nm, yellow-green 560nm) that are distinct from the excitation light and ambient illumination. By using bandpass filters on the cameras that pass only these specific wavelengths, the system can isolate the phosphorescent signal from other light sources, achieving excellent separation of motion data from ambient light contamination.
3Measurement precision
If phosphorescent materials are used with strobed lighting, then high contrast and precise tracking are achieved, but synchronization between light panels and cameras is required
Solution Approach 1:
The synchronization system serves multiple functions: it triggers the strobing of UV/blue light panels, synchronizes camera shutter timing, and coordinates the emission detection windows. This centralized synchronization controller manages all timing-critical operations, reducing the need for separate control systems and simplifying the overall device architecture while maintaining precise coordination between lighting and imaging components.
4Measurement precision
If phosphorescent makeup or paint is applied to subjects, then traditional markers are eliminated and motion capture accuracy improves, but the application process becomes more complex
Solution Approach 1:
The phosphorescent materials are formulated with specific properties including glow duration (persisting 10-100ms after excitation), emission wavelength (green 530nm or yellow-green 560nm), and intensity characteristics. These parameters are optimized to match the strobe frequency and camera exposure timing, ensuring reliable detection while simplifying the application process through standardized formulations that can be applied as cosmetics or paints.
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
This approach enhances the accuracy of motion capture by providing high contrast between phosphorescent patterns and the background, allowing for more precise tracking of motion data without the need for traditional markers, and maintains a steady illumination perception for performers.
Implementation Method 1
one or more fluorescent lamps configured to strobe on and off responsive to a first one of the one or more synchronization signals
Implementation Method 2
the fluorescent lamps charging phosphorescent makeup, paint or dye applied to a subject for a motion capture session
Data Source
AI summary
A system and method are described for performing motion capture on a subject using fluorescent lamps. For example, a system according to one embodiment of the invention comprises: a synchronization signal generator to generate one or more synchronization signals; one or more fluorescent lamps configured to strobe on and off responsive to a first one of the one or more synchronization signals, the fluorescent lamps charging phosphorescent makeup, paint or dye applied to a subject for a motion capture session; and a plurality of cameras having shutters strobed synchronously with the strobing of the light source to capture images of the phosphorescent paint, wherein the shutters are open when the light source is off and the shutters are closed when the light source is on.