Practical issues for binary code pattern unwrapping in fringe projection method - Emerging Trends in Image Processing, Computer Vision, and Pattern Recognition - page 481

FIGURE 8 (a)-(h) Binary patterns projected on the reference plane. (i)-(k) Fringe patterns
projected on reference plane.
FIGURE 9 (a)-(h) Binary patterns projected on the object. (i)-(k) Fringe patterns projected on
the object.
6 Three-dimensional reconstruction
It is possible to specify shadow areas using the fringe paterns. The threshold value for the
mentioned operation is 20 using a 3 by 3 mask.
A=(I1+I2+I3)/3;
MSK=abs(I1-A)<TH & abs(I2-A)<TH & abs(I3-A)<TH
Figure 10 demonstrates the output resulting from applying the shadow recognition mask.
FIGURE 10 Shadow recognition output.
6.1 How to Compute the Initial (Wrapped) Phase
The wrapped phase can be calculated using the following command:
Wrapped Phase=atan2(sqrt(3)*(I1-I3),2*I2-I1-I3).*MSK;
Figures 10 and 11 illustrate ambiguity code of the scene before and after object placement
( Figures 12 - 15 ) .