Calibration Registration Example

Fixed-point video registration provides two calibration methods: The first uses reference maps for control point selection, while the second involves inputting camera parameters. This guide demonstrates the complete calibration registration workflow using a fixed rotating video as an example.

Registration via Reference Map

Step 1: Connect Video

Note: The Advance Settings button reopens the Add Video Data dialog. For other video dataset connection methods, see Create New Video Dataset.

  • Right-click the datasource and select New Dataset to open the dialog. Choose Video in Type to activate the Add Video Data dialog. Click Add Local Video to import video files.
  • After closing the Add Video Data dialog, the New Dataset dialog auto-populates the dataset name using the video filename. Custom naming is available.
  • Configure the coordinate system as Projected Coordinate System (recommended Mercator projection) in the New Dataset dialog.
  • Click OK to complete video connection.

Step 2: Obtain Reference Map

Ensure the reference map shares the same coordinate system with the video dataset.

  • Use web datasources: Navigate to Start tab → Datasource group → Web dropdown → Tianditu. In the Open Web Datasource dialog, select Global Image Map Service (Mercator), then add the img dataset to map. Locate the filming area and save the map.
  • Use local imagery: Add existing image data near the filming location to map and save. This example uses local imagery as reference.

Step 3: Create Registration Window

  • Open video dataset in video map. Click Video Maps tab → Video Registration group → Registration Mode (or Video Registration tab → Display Mode group → Registration Mode) to open the Reference Map dialog.
  • Click Add and select the saved map as reference.
  • Confirm selections in both dialogs to establish the registration window.
  • Adjust rotation angle (e.g., 260°) to align reference map with video orientation.

Step 4: Mark Control Points

For rotating videos, spatialization can be performed at single or multiple angles.

  • Single-angle spatialization (e.g., horizontal 234°, vertical 37°):
    • Navigate to target angle using video controls. Right-click video layer → Properties → Video Layer Properties Panel. Add new video parameters via Add button, then delete default parameters at 0s.
    • Click Video Registration tab → Calibration Registration group → Staking Points to mark corresponding control points on both maps:
    • Distribute points evenly across frame. More points improve accuracy. Input elevation values if available.

  • Multi-angle spatialization:

    • Add video parameters at different angles through Video Layer Properties Panel and mark control points separately.
    • Input PTZ values (visible at video's bottom-right) for each angle in PTZ Position.
    • Input approximate camera position and elevation range before registration.

Step 5: Input Known Camera Parameters

Improve accuracy by inputting known parameters before registration:

  • Click Video Registration tab → Calibration Registration group → Registration Parameters. Input XY coordinates and Z range.
  • Set iteration count and sample size (default 1000/200 usually suffices).
  • Check Height Involved in Computation if elevation data exists (unchecked in this example).

Step 6: Perform Registration

Click Video Registration tab → Calibration Registration group → Perform Registration to complete single-angle calibration.

Step 7: Review Results

Check total/average errors in Output Window. Switch to Browse Mode and overlay vector data for visual verification.

Step 8: Optimize Accuracy

Post-registration generates Source/Result point datasets for each angle. Compare datasets to identify outliers:

  • Add both datasets to map to visualize displacement discrepancies.
  • Check Error field in Result dataset properties.
  • Modify problematic control points and re-run registration.

Registration via Camera Parameters

Directly input known camera parameters for registration.

Step 1: Connect Video

Follow same procedure as Reference Map Registration Step 1.

Step 2: Set Camera Parameters

In Video Layer Properties Panel, manually input Camera Intrinsic Parameters and Extrinsic Parameters for each angle. See Camera Parameters Guide.

Step 3: Save Parameters

Click Video Registration tab → Camera Parameter Registration group → Save Parameters to finalize calibration.

Related Topics

Calibration Registration

Registration Parameters

Video Layer Properties Panel

Camera Parameter Registration

Camera Parameter Registration Example

SuperMap UAV Survey Video Registration