Image Processing Reference
In-Depth Information
Image-Stabilization Systems Simplified
Figure 5.2 The beam of light from a laser diode is focused using a high-quality optical
microscope objective and passed through a spatial filter to make a spherical wave-
front. The spherical wavefront is collimated using a lens to provide a nearly planar
Figure 5.3 Cross section through a Gaussian beam. The region near the center of the
beam can be selected to provide a nearly planar wavefront.
from a Gaussian profile, the beam must be expanded so that the central region in the
peak of the beam is used. This has the additional advantage of reducing the beam
intensity to a level that can be easily viewed by a video camera without light inten-
sity-reducing filters.
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