(ENG) [4DDM] Calibration

Owned by Joowon Hong (홍주원) (Unlicensed)
Last updated: 09/26/2023
6 min read

This is the tab where the camera performs the most important calibration for shooting. You can apply 2D, 3D, or 2D+Position Tracking calibration to help create matched Replay video clips and live video. This is an essential step before creating a movie with 4DPD.

Calibration View

This window shows the capture screen taken for the current camera properties to set the calibration. Use this window to perform calibration.

  • Calibration Function and Button Descriptions

  1. Calibration Function and Button Descriptions

  2. Confirm incorporation of calibration settings                          

  3. Skip Sync: Exclude out-of-sync cameras during recording

  4. [Record]: Take an image for calibration in the current state.

  5. [<Previous], [Next>]: Select the front and back camera

  6. Ability to draw an imaginary line for calibration

  7. Select a camera from the drop-down

  8. Histogram: Display histogram

  9. Guide Line: Display guidelines in the camera preview area

  10. Screen Centerline: Separate top and bottom points based on the blue centerline (Top, Middle,Bottom for 3Point)

  11. Point Copy: Copy the calibration point of the previous or next camera to the current screen

  12. ResetAll: Delete calibration points of all cameras

  13. RotateAll: Rotate the image of all cameras 180 degrees

  14. Default 2D Point All: Applies 2 or 3 points specified as an arbitrary default value to all images.

  15. Image Load/Save: Save/load recorded images, select as folder when saving/loading.

  16. Point Load/Save: Save/load coordinate values, select as *.pts file when saving/loading.

  17. Calibration Data Load/Save: Save/load recorded image and coordinate values, select as folder when saving/loading

 

Calibration Setting

This is the step where you view the Calibration View and make detailed settings to actually do the calibration work.

  • Calibration Settings > Type of Calibration

    • 2D : How to calibrate based on a reference bar

    • 3D: Calibration based on a fixed point on the floor, such as a stadium line.

    • 2D+Position Tracking: How to enable position tracking using both 2D and 3D methods.

 

  • Calibration Settings > Select a Preset

    • If you have a gimbal, specify a calibration value per preset

 

  • Auto Point Move

    • One Point: Setting a single point on one camera automatically moves to the next camera

    • Full Point : Set all points on one camera to automatically move to the next camera.

    • (T-B for 2 points, T-M-B for 3 points)

    • ※ T : Top / M : Middle / B : Bottom

 

  • 2D Calibration Point Mode

    • 3 Point(T-M-B): Setting points by dividing them into top, middle, and bottom (Top / Middle / Bottom)

    • 2 Point(T-B): Set the point by dividing the top and bottom (Top / Bottom)

 

  • 2D Calibration Separator Move Mode

    • Manual: Manually set the separator to separate T-M-B (separates T-B for 2point)

    • Auto: Set the separator for T-M-B automatically (separates T-B for 2-point)

 

  • 3D Calibration

    • Venue: Select a venue for 3D calibration

    • Offset Y: Move all 3D calibration points (4 points) up/down at once.

    • Focal Length: A function that allows you to match the distance between the 3D calibration value and the actual subject being photographed.

 

  • 2D / 3D Calibration Current Data

    • Reset: Resets the camera's calibration points

    • Rotation: Rotates the video of the camera by 180 degrees.

 

  • 3D Calibration Set Swipe

    • Configurable when using 4DLive

    • When using 4DLive, the ability to re-center the reference point from the user's own zoomed-in view.

    • ※ This must be set in order to use the Position Swipe feature, and is usually set to the height of the person on the screen.

Calibration Result

This is the step for grouping or replay grouping calibration values after finalizing the calibration task.

 

  • Result Table

    • Preview: View calibration results in a video

    • Group: Right-click to set the desired group

    • Scale Reg.:

      • Calculate Scale based on the first camera and last camera selected in the registered group to designate as the Scale reference channel.

      • If additional Scale Reg values are selected in the middle, the scale is calculated with the first camera, the last camera, and the cameras set to Scale.

    • Adjust Calc..: Check whether to apply calibration

Step of Calibration

Step 1-1.

  • Steps to set up 2D Calibration

    • Select [Type of calibration] > [2D].

    • Select [Point mode] > [3Point] or [2Point].

    • After selecting a location, right-click to zoom in on the clicked point.

    • After selecting a precise reference point, right-click to complete all point settings until the last photo.

    • If you need to reset the calibration, click No.(ID) and click Reset Button of Current Data.

      • ※ When 3Point, Top, Middle, Bottom / When 2Point, Top , Bottom based on the blue reference bar

      • ※ Left-click and drag the reference bar to move it.동 가능

Step 1-2.

  •  Steps to set up 3D Calibration

  1. [Type of calibration] > Select [3D].

  2. [Select venue] > Select the desired venue

  3. [Venue Preview] > Right-click to zoom in, right-click to select points, and set the selection order to Red -> Yellow -> Green -> Blue.

  4. Set points on all cameras in the order set in Venue Preview.

  5. Select the first camera in each group and set the center point, right-click to set the center point

Step 1-3.

  • 2D+Position Tracking

  1. Select [Type of Calibration] > [2D+Position Tracking].

  2. Select [Point mode] > [3Point] or [2Point] to set 2D points

  3. Select [3D Calibration] tab to proceed the same as 3D calibration

 

Step 2.

  • [Verify calibration data]

  1. Select the Calibration button to view calibration results

    • Reg: The camera that the scale calculation is based on (typically the front and end cameras of each group, but you can add more in the middle if needed).

    • Rot: Rotate the video 180 degrees

    • Adj X, Adj Y, Adj Z, Angle: Calibrated values by applying Calibration to the X, Y, Z axis and Angle.

    • Rot-X, Rot-Y: Calibrated values by applying calibration to the X, Y axis vertical lines.

    • Scale : Length of the reference bar relative to the reference channel registered as reg.

    • Crop: Ratio of the image cropped by Scale

    • Use: The ratio of the image that is actually used after being cropped by the scale.

  2. Values with large deviations from other settings are colored yellow so you can see them.

Step 3-1.

  •  [Set up the entire Calibration Group]

  1. Complete a 2D or 3D or 2D+Position Tracking operation to ensure that all the blanks in the Adjust Calc on the right are checked.

※ Adjust Calc Checking for No.(ID) with uneven camera connections is unnecessary

 

 

 

 

 

 

Step 3-2 

  • [Setting up a 4DReplay Group]

  1. Set up a Calibration group for each camera

  2. Select the cameras you want to group with [shift], [Ctrl].

  3. Right click and save to Group number

  4. Select "Scale Reg" for the first camera and the last camera to be scaled to the first camera of the desired calibration group.

  5. Click [Save] of Calibration Data

 

 

 

 

Step 3-2.

  • [Setting up Position Tracking Swipe]

  1. Select the checkbox for Set Swipe.

  2. The Live Groups preset by IMS are displayed in the lower left corner. (See LIve Manual for details)

  3. When you click a set Live Group, the channels in the selected group are activated with red text.

  4. Right-click on the Frame screen and drag from top to bottom to set the swipe length for each Live Group.

 

 

 

 

 

Step 4.

  • [Check the preview]

  1. Click Preview on the top right of the Result table=

  2. Check if the calibration is correct (reset the calibration if you see any wobble)

  3. Calibration completed