Image Processing Reference
Figure6.1Millimeter-wave( = 3300m)photo.(CourtesyofTrexEnterprises)
Figure6.2Longwaveinfrared( = 8-9m)photo.(CourtesyofFLIR)
eyes appear isothermal—there is little temperature variation over their surface, and
no differentiation between the whites of the eyes and the iris. The nose and cheeks
are noticeably cooler, the result of frostbite inflicted by severe weather during my
time in Antarctica.
The MWIR face in Fig. 6.3 is very high in contrast, as captured by a cooled
indium antimonide infrared camera. Small temperature changes on the surface
translate into large intensity variations in the MWIR emission. This waveband
conveys the maximum thermal contrast for objects that are close to room
temperature, making it a powerful tool for diagnosis of thermal anomalies in both
machines and living organisms.