nhergen
commented
1 month ago Ressources:
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
Read up on COLMAP, at least the part on how to create the "perfect" image and present your findings in short form to the team