Registering Markers Captured with a Digital Camera

Recommended Conditions for Capturing Markers

• Number of pixels to capture: Approx. 2000 megapixels (5760×3840 pixels) / File format: JPEG / Focal length (35 mm equivalent): 20–28 mm (X–X in)
• Shooting mode: Aperture Priority AE (Av) / Image stabilizer: Off / Focus mode: Manual focus
• Aperture value: F8 / ISO speed: ISO 1600 / White balance: Auto

Preparation

1. Place the calibration patterns on the floor or other surface.

2. Capture the calibration patterns.

   • From directly above (A), make adjustments so that all of the calibration patterns fit in the screen and then capture them.
   • From the directions of (B) to (E), make adjustments so that the screen is full of calibration patterns centered on the six patterns at the center and then capture them.
   
   
   
   • Capture at least three images in one direction, and up to a total of 24 images.

3. Capture the markers.

   • Place the markers to register with the origin marker (A) at the center.

     

   • Capture all of the markers so that first the origin marker (A) is placed in the screen, and then a marker placed in the screen in the last capture is placed in the screen as with (B) and (C).

     

   • You can expect to improve the reading accuracy for camera tracking by repeatedly capturing while changing the capture angle as shown below.

     

Registering Captured Images

1. Select [Basic Settings] in the MREAL Configuration Tool window.

2. Select [Use Marker Tool] in [Define World Coordinate System], and click [Start Tool].

3. Select [Use the Recorded Image File] and click [OK] in the following window.

   
   • Camera Parameter Tool launches and a window for selecting a marker image appears.
   • Select a calibration pattern image, and click [Open].

   • Click [OK] in the following window.

     

4. Click [Calculate] in the displayed window.

5. When the following window appears, click [Close].

   

6. Check the calculation results and click [Apply] if there is no problem.

   • For the check method, see “Configuring Detailed Settings of Logicool Brio” in “Bird's Eye View Images”.

   • If there is no problem with the check results, click [OK] in the following window.

     

7. Click [OK] in the following window.

   

8. Select the [Edit Mode] tab in the Marker Tool window.

9. Delete the Default Marker information.

   • Select the Default Marker in the [Marker Name] list, then right-click and select [Delete from Marker Definition].

10. Register the origin marker.

    • Right-click in the [Marker Name] list area and select [Add MREAL Marker].
    • Enter the ID and size of the marker you decided to use as the origin marker in the [Add MREAL Marker] window.
    • Select [Origin Marker] from the [Input Type] list, and click [OK].

11. Select the [Calibration Mode] tab in the Marker Tool window.

    • The window for selecting the marker image appears.
    • Select the marker image, and click [Open].

12. Click [Calculate] in the displayed window.

13. When the following window appears, click [Close].

    

14. Click [Apply] then [OK] in the Marker Tool window.