| The coded light approach may be combined with the well known
sub-pixel algorithms (in this case we should better say 'sub-line algorithm')
such as, for example, the so-called 'phase shifting' method. With this
method, the dark to bright borders of the projected lines are analyzed
to interpolate the phase in order to determine whether a camera pixel
is looking towards the left or right projected line-edge. To support
this method, line-projectors from ABW are optionally able to generate
gray-scaled lines. The Volkswagen R&D facility in Wolfsburg (Germany)
reports an accuracy for a pixel of 1/7500 of the diagonal of the measured
volume.
For human modeling appropriate configuration should be used. For example
digitizing of a human face should be done with at least one projector
and two cameras. So only some minor regions at the nose and eyes are
not digitized. |
