15
Experiments
Introduction
Classification
Time-multiplexing
Spatial codification
Direct codification
Time-multiplexing: Gray code + Phase
shifting (I)
Gühring’s line-shift technique
• A sequence
of binary
patterns (Gray encoded) are
projected in order to divide the object in regions
• An
additional periodical
pattern is projected
• The
periodical pattern is projected several times by shifting it in one direction in order to
increase the resolution of the system à similar to a laser scanner
Example: three binary
patterns divide the object in 8
regions
Without the binary patterns
we would not be able to distinguish
among all the projected slits
Every slit always falls
in the same region
Conclusions
