Camera Setup Tips
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Theia Axiom - v2025
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When setting up cameras, use full circle or oval configurations with multiple sagittal and frontal views. Position cameras at a height of 4 to 8 feet (1 to 2.5 meters).
Aiming for the participant to appear approximately 500 pixels tall in the frame.
½ frame height (landscape @ 1080p)
¼ frame height (portrait @ 1080p)
Avoid unusual angles and strive to keep all cameras flat and level for consistent data capture.
Proper lighting is crucial for high-quality video data in markerless motion capture. Outdoors, be mindful of the sun's position to avoid harsh backlighting and adjust camera settings to prevent overexposed or dark images. Indoors, ensure adequate lighting, as ambient levels are typically lower; aim for at least 500 lux, with 1,000 lux preferred. Be cautious of natural light sources like windows, which can cause silhouette effects.
Use light sources with a color temperature between 3,500K and 6,500K and a Color Rendering Index (CRI) of 70 or higher for accurate color representation. Diffuse, non-directional lighting minimizes shadows and glare, enhancing video quality. Avoid light sources that flicker near your recording frame rate to prevent inconsistent brightness
Selecting the appropriate frame rate is crucial for accurately capturing motion in data collection. A frame rate too low may miss subtle movements, while an excessively high frame rate can degrade video quality and produce unnecessarily large data files. To determine the optimal frame rate, start with a literature review to understand standard practices for similar studies. Next, assess your camera hardware's capabilities, ensuring it can support the desired frame rate without compromising resolution. Some cameras offer 'windowing' features to increase frame rates by capturing only a portion of the sensor; however, this should be used cautiously to avoid missing parts of the subject. Conduct pilot studies to test different frame rates, reviewing the clarity and quality of the captured movements. Be mindful that higher frame rates may require more lighting and can lead to issues like frame drops due to increased data throughput. Balancing these factors through thorough testing and consideration will help you select a frame rate that meets your experiment's needs.
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