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Theia Axiom - v2025
Theia Axiom - v2025
  • Theia3D Documentation
    • What's New
    • Theia3D Documentation
    • Welcome to Theia3D
    • Keyboard Shortcuts
    • Getting Started
      • System Requirements
      • Installation
      • License Activation
      • Startup Window
      • Theia3D Basics
      • Camera Setup Tips
      • Tutorial Videos
    • Data Collection
      • Data Collection Principles
      • Recording Intrinsic Lens Calibrations
      • Recording Extrinsic Chessboard Calibrations
      • Recording Extrinsic Object Calibrations
    • Theia3D Interface
    • Theia3D Dropdown Menus
      • File Menu
      • Analyze Menu
      • Display Menu
      • Results Menu
      • Calibration Menu
        • Check Calibration
        • Lens Calibration
        • Chessboard Calibration
        • Object Calibration
        • Adjust Calibration
      • Tools Menu
        • Check Synchronization
        • Organize Videos
        • Format Sony Multicam
        • Assign Calibration Files
        • Modify People IDs
        • Toggle Views
        • Display Video Metadata
        • Enhance Videos
      • Settings Menu
        • Settings Menu
        • Analysis Preferences
        • Rendering Preferences
        • Setup Preferences
      • Help Menu
    • Theia Model Description
      • Default Model Description
      • Full Body Model Description
      • Separate Arm and Head Model Description
    • Data Formats
      • Video Data
      • Calibration Files
      • Theia3D Workspaces
      • C3D Files
      • FBX Files
      • JSON Files
      • Video Overlays
    • Theia3D Batch
      • Theia3D Batch Interface
      • Setting Up a Batch
      • File Menu
      • Help Menu
      • Settings
      • Trials
      • Preferences
      • Batch Processing Outputs
    • Camera System Requirements
    • Sony Camera Package
      • Components
      • System Setup
      • Data Collection
  • Troubleshooting
    • Troubleshooting Documentation
    • Error Messages
      • License Errors
        • License Activation Failed
      • Organize Data Errors
        • Input directory has no mp4 or avi files
      • Load Video Data Errors
        • Videos not formatted properly
        • Only [#] videos found
        • Videos are not the same length
        • Unsupported video codec detected
        • Invalid video
      • Load Calibration File Errors
        • Unable to load calibration
        • Required camera parameter groups not present
      • Load Workspace Errors
        • Selected folder does not contain a valid Theia workspace
        • Incompatible workspace
      • Calibration Errors
        • Camera extrinsics optimization step 3 failed
        • Unable to detect chessboard in overlapping frames for all cameras
        • Too few chessboards detected (<25)
        • Field of view coverage insufficient (<60%)
      • Movement Trial Processing Errors
        • Track people not complete
        • Abnormally high tracking errors
    • Visible Issues
      • Coordinate system is out of place in one camera view
      • Coordinate system is in different positions and/or orientations in all camera viewse
      • Coordinate system is in an incorrect but consistent position and/or orientation in all views
      • Skeleton is consistently outside the body
      • Skeleton is momentarily incorrect
      • Skeleton is incomplete
      • Skeleton is completely missing
      • Skeleton is jittery
    • Sony Troubleshooting
      • Initialization Issues
      • Unstable Connection
    • Other Issues
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  • Number of Cameras
  • Synchronization and Video Duration
  • Field of View
  • Joint Visibility
  • Subject Clothing

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  1. Theia3D Documentation

Camera System Requirements

PreviousBatch Processing OutputsNextSony Camera Package

Last updated 2 months ago

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This section describes the basic camera system requirements for recording data to be used with Theia3D. See for additional recommendations and principles to follow when recording video data for Theia3D.

Number of Cameras

Theia3D requires a minimum of six cameras for tracking; however, we recommend a minimum of eight cameras for most capture volumes. The number of cameras required will increase with movement complexity, capture volume size, capture volume complexity, and the number of people to be tracked. The field of view and joint visibility requirements outlined below are the best guides when determining the number of cameras required for a specific capture volume.

Synchronization and Video Duration

The cameras must capture synchronous videos with identical start times and durations to be used with Theia3D.

Field of View

Person identification and tracking perform best when the people of interest are fully visible and cover a large percentage of the fields of view of the cameras. In most applications a height of 500 pixels is adequate - this requirement may increase based on camera setup, focus, and image quality. It is important that the people of interest are in focus and clearly visible.

Joint Visibility

Ideal tracking conditions are achieved when all joints are visible in all cameras; however, this is rarely attainable due to occlusions from other limbs, people, and the environment. At a minimum, each joint must be visible in at least three cameras. When setting up the cameras it is important to position and orient the cameras in a way that minimizes occlusions while simultaneously providing views of the subject(s) from varying angles to improve joint depth and position calculations. For example, a purely sagittal view results in several occlusions and poor tracking from that view but provides useful information for identify the depth of joints tracked in a more frontal view.

Subject Clothing

Theia3D does not require people to wear specific clothing to be tracked. However, loose or baggy clothing may result in lower quality tracking. As a general rule, if you can easily identify joints in the camera images, then Theia3D can infer the joint positions as well.

Data Collection