Q: Can I use my own cameras?
A: Yes you can, however the cameras must collect fully synchronized, high quality video data. We only support data collected using specific camera systems that we have verified the quality and synchronization of the captured videos. So, while you can use your own camera system, if it is not on our list of verified equipment it is your responsibility to ensure the system meets the requirements of Theia3D, and we will not be able to provide support to any issues related to data collection or quality.
Q: What is the maximum sampling rate? How about data capture length?
A: The maximum sampling rate and capture length are limitations of the cameras used and thus are different for every camera system. Longer captures will take longer to analyze in Theia3D.
Q: Can the system be used outdoors? (How about low-light situations?)
A: Yes. This system can be used outdoors and will perform well in any environment as long as the lighting is such that the person is clearly visible, and key features, such as the hands and feet, are easily distinguishable in the video.
Q: What are the limitations on the capture volume?
A: The capture volume size will be limited by the number of cameras. Larger volumes and volumes of more complex shape require more cameras.
Q: How long does the analysis take?
A: It depends on the computer, the number of GPUs available, the number of cameras, and the capture frame rate. A typical collection of 10 seconds, collected at 40 frames per second, for 8 cameras will take around 1 minute to process on a single high-end graphics card. An Nvidia RTX 2080Ti or better is the recommended graphics card.
Q: Can I include force data for kinetics?
A: Only if your camera system supports the synchronized collection of external devices. The Qualisys Miqus camera system, that has been verified to work with Theia3D, has hardware options for collecting synchronized data from force plates, instrumented treadmills, EMG, and marker-based cameras.
Q: How fixed are the models? Does it support non-standard subjects like prosthetics, animals, or a multi-segmented foot?
A: Currently, Theia3D supports a single model. That being said, abnormal movements and pathological gait can be tracked using this software.
Q: Can the processing be made automatic?
A: Yes, after the system is setup, the 3D analysis process can be fully automated for single trial or batch processing. User input is only required to start the process.
Q: Can I export data for reporting? Is there built in reporting?
A: Report generation and biomechanical analysis functionality is not built into Theia3D. To generate reports, we recommend using Visual3D (which is included in our packaged offerings) as it can automatically detect the data exported by Theia3D and build the required models. However, we also export C3D files that can be used in other software.
Q: Does Theia3D support animation or gaming development?
A: At this time Theia3D only exports C3D formatted files and AVI video files with segment/skeletal overlays applied. Future versions may export FBX formatted files.
Q: Does this work on multiple people or just one?
A: Yes. Theia3D identifies, tracks, and analyzes every person that satisfies the visibility requirements.
Q: Do I need any other software other than Theia3D?
A: Yes. You need software to run the cameras and collect the video data. Theia3D processes this video data to produce 3D kinematic data (segments and rotation matrices) that is ready for analysis. Additional analysis or 3D processing software (such as Visual3D) can be used to interpret and report the 3D kinematic data.
Q: Has Theia3D been validated?
A: Recent studies have demonstrated the concurrent validity of Theia3D with existing marker based motion capture systems when measuring spatiotemporal gait parameters (https://engrxiv.org/j4rbg/), shown that the gait kinematics measured with Theia3D are more reliable than those measured with existing marker based systems (https://biorxiv.org/cgi/
Q: How accurate are the results compared to other markerless systems?
A: Because of our dedication to data quality for biomechanics, Theia3D is state of the art in terms of accuracy. To our knowledge, no markerless system has been validated to the degree of Theia3D.