To reduce
radial and relief displacements, Parallel Camera Movement
shooting is recommended. This technique involves moving the
camera at a set distance from an object, such as the 3-D
Model, to capture it in sections. Each picture should be
shot perpendicularly to the model surface.
Place
a high-resolution digital camera on a tripod at 4-m distance
from the base of the tilted model. Draw lines perpendicular
to the model’s horizontal plane on the floor at 40 cm
intervals. Add a reference line at the end of the orthogonal
lines to serve as guide in moving the camera from one
position to the following one. Adjust the focal length
setting to capture an area of approximately 40 cm x 50 cm.
Set
the camera to the maximum resolution (e.g. 2272 x 1704
pixels) and compression capacity. This setting will provide
high quality images of approximately 2 MB each.
The number of images that can be stored on the Compact
Flashcard depends on its storage capacity. A standard CF-32M
card may contain up to 14 images shot at these high quality
settings.
To cover the entire area of a model measuring 2.5 x 1.2
meters, shoot at least 24 pictures. Intermediate downloads
to a separate storage device may therefore be necessary.
Position the
camera with the use of a plumb line exactly above the
intersection of the orthogonal and the reference lines. The
height of the camera above ground is chosen and has to be
constant throughout the first passage.