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VIOSO Anyblend VR&SIM 5

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  • VIOSO Anyblend VR&SIM Software Overview
  • 3D calibration
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    • Calibration of a partial dome screen with an off-centre camera

Calibration of a partial dome screen with an off-centre camera

574 views 0

Emanuel
April 17, 2020

Basic considerations:

  • The camera, describing VIOSO native coordinate system
    • By positioning the test image and entering the radius and start angle, you name a 3D coordinate for every projector pixel on screen.
    • This is like a measured point with some tolerance in the real world.
    • View poses must use the same eye point.
  • A main view direction and eye point, describing the correspondence between IG and VIOSO
    • All views have same eye point.
    • There is no fix eye in IG — the eye can be everywhere in the virtual world.
    • There is a main view direction. This is where we go “forward”.
    • So every view is just an angular offset (yaw, pitch, roll angle) to that main view.
  • Offset angles to a main view
    • IG’s forward.
    • View from eye “forward” to screen.
    • Starting at SPCalibrator 4.3, it became easier, as we can use relative angles now.

To position a camera somewhere else, here is the workflow on how to position a fisheye camera at 2m height on a 4m diameter / 3m height cropped dome (220°x120°) screen.

  • Use HQ calibration kit. It comes with a 185° lens and very sensitive sensor
    • Fix your camera at 2m height facing the screen.
    • The central ray must go through the center of the imaginary sphere that the screen is part of.
    • Go as far back as you need to see your whole screen. If the upper left/right corner does not have any projection on it, you may need to move closer.
    • Adjust “Dome master” test image:
      • Pole is now where the central ray of the camera hits the screen.
      • Image is now pitched down.
      • Fill projection. Make longitudes straight.
      • Latitudes are circles.
      • Do not try to line up outer circle with screen — just cover the screen using 4-point warp.
    • Now figure the angles
      • Find out which pitch the main view has

        • ZERO (0,0,0) is still the sphere center.
      • Figure start angle
        • There are 10 latitude lines on our test image, numbered (0,) 10, 20, .. 90 (, 100), like percentages.
        • Figure which would be the equator of a globe (you might even think of some extra line somewhere between).
        • The number E gives a ratio:
        • For example: Equator (biggest circle) is the middle of line 70 and 80. This makes E=75%, thus
        • Use this angle in “fisheye to spherical dome”-conversion.
      • Figure view poses
        • Eye is always 0,0,0.
        • View poses are basically the same as with a  standard camera position, but pitched.
        • Create “main view”, which is pitched (rotation around x) by 30°, -y is up, that makes roll (rotation around z) 180°.
        • Do auto pose.
        • Use “main view” as relative view (SPCalibrator Version 4.3).
        • Make them nice. They should be the same as the ones used in VRSG before. Remember: screen, projector position, and “forward” have not changed!

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Related Articles
  • Method 1: 3D Alignment based multi-cam
  • Method 2: Marker based multi-cam
  • Method 1: Abstract Displays
  • Method 2: Legacy
  • Export for Barco WB2560 (MIPS)
  • 3D model creation

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