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DATA ACQUISITION

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Pascal edited this page May 27, 2024 · 1 revision

Ressources:

  1. https://medium.com/@heyulei/capture-images-for-gaussian-splatting-81d081bbc826

Camera

Settings (might need to be adjusted depending on our camera and the brightness/scene):

  • Aperture: f/11
  • Exposure time: 1/13 sec
  • ISO: 100
  • Focal Length: 16mm
  • Focus Mode: Manual Focus
  • White Balance: C.Temp/Filter
  • DOR/Auto HDR : Off
  • Lens Compensates: Shading Comp. Off, Chromatic Aberration Comp. Off, Distortion Comp. Auto (16–50mm kit lens don’t support Off)
  • File Format: RAW (6024 x 4024 pixels in Demo)
  • calibrate to correct lens distorsions

Avoid:

  • Auto Aperture (variations in focus distance)
  • Auto Exposure (may result in exposure variations)
  • Auto ISO (exposure discrepancies)
  • Auto Focal Length (focus distance)
  • Auto White Balance (color variations)
  • DRO/Auto HDR (differencies in exposure variations)
  • Lens Compensation (Auto Settings may differ in between captures)
  • JPEG Format (Lens Compensations cannot be adjusted later)

Tips:

  • Higher aperture number: This widens the focus distance, but avoid setting it too large as it may lead to a drop in image quality. Each camera and lens combination should find the sweet spot for the aperture number
  • Lower ISO: Higher ISO settings can introduce noise into the images.
  • Wider focal length: This helps reduce the number of image captures required while increasing overlap.
  • Get a remote control for the camera (to avoid big shadows etc.)

Scene

  • plan positioning (see 1. Capture Pattern for Interior)
  • Go for wide viewing angles (fewer number of pictures and more overlap)
  • Ensure sufficient Lighting but avoid overly bright lighting conditions
  • Look for high contrast (Edges, corners, patterns) to make feature detection easier
  • consistant illumination

Images

  • Need to be sharp and focused
  • Overlap is necessary (60-80%)
  • different angles, viewpoints and distances to scenes
  • Avoid Over-/ and Underexposure
  • the more complex, the more images from different angles
  • avoid symmetrical images (loss of paralax information)
  • The Demo only needed 527 Images

Alternatively we could also take videos, as it might help with the overlapping and the capturing of the whole scene

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