Image Processing Reference
In-Depth Information
Figure2.25 Chinook helicopter taking off at night: left—VIS; right—MWIR (3-5 mm).
Figure2.26 A 168 grain .30 caliber bullet in flight: top—MWIR (3-5 mm); bottom—VIS.
1 meter out of the muzzle of a military rifle. The bullet is moving at 840 meters/sec
or about 1900 mph. Note the various hot parts—aerothermal heating makes the
tip glow, friction makes the sides glow, and the tail of the bullet is reflecting the
muzzle flash. The top image was made with a special ultrafast MWIR camera with
a shutter speed of 1 microsecond, the bottom with an ultrafast visible-light video
camera with a 2-microsecond shutter speed and external illumination.
Thermal Imaging and Biology
Seeing the infrared light emitted by objects that are only a little hotter than room
temperature is a very useful ability for anything that hunts at night. Human eyes
alone cannot see the infrared glow from another person or an animal. But a limited
type of “thermal vision” does exist in the animal kingdom. Rattlesnakes and other
pit vipers can locate their warm-blooded prey in total darkness by detecting heat
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