How to setup your camera
Different types of camera can be used to capture an input dataset for ContextCapture. These can range from
smartphones to the latest DSLR cameras and also include Camcorders. The quality of the resulting 3D models is
dependent on the quality of the input photos and their spatial configuration.
To get the best results in ContextCapture, we recommend:
A constant focal length during the acquisition: zoom "with your feet",
Constant and homogeneous lighting.
You should avoid:
Blurry photos: use adapted settings, and possibly a tripod under low lighting conditions.
Flash light.
Optical stabilization.
You must banish:
Digital zoom,
Any resizing/cropping/rotation of the input photos (turn off your camera's auto-rotation mode) ,
When Capturing Video the follow formats are recommended:
Audio Video Interleave (AVI)
MPEG-1/MPEG-2 (MPG)
MPEG-4 (MP4)
Windows Media Video (WMV)
Quicktime (MOV)
For more information please refer to ContextCapture User Manual ("Preparing the imagery dataset").
Limitations
1. Enough photos must be taken to cover the entire object to successfully reconstruct. Every point of the
scene must be captured in at least two adjacent photos.
2. Transparent or shiny parts cannot be properly reconstructed: glass, water, etc.
3. Parts of the object with a uniform aspect cannot be reconstructed: plain walls without texture, etc.
4. Photos looking at the same part must be taken from points of view that are neither not too similar nor
too different.
How to capture objects
Capturing an object is among the simplest of tasks. Our recommendations for getting started with using
ContextCapture are:
A little knowledge and some practice usage is required before it can be done properly. Note that that each part
you want to reconstruct must be visible in at least two different photographs.
An easy way to fulfill this is to circle around the object taking small steps (ensure a minimum 60% overlap and a
maximum angle difference of 15° is maintained between consecutive photos). Typically, you also want to get a
uniform resolution. To achieve this, try to keep the camera at the same distance from the object during the
acquisition process (Figure 1).
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