DATA ACQUISITION

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