Infrared thermography (IRT), thermal imaging, and thermal video are examples of infrared imaging science. Thermal imaging cameras detect radiation in the infrared range of the electromagnetic spectrum (roughly 9,000–14,000 nanometers or 9–14 µm) and produce images of that radiation, called thermograms. Since infrared radiation is emitted by all objects above absolute zero according to the black body radiation law, thermography makes it possible to see one's environment with or without visible illumination. The amount of radiation emitted by an object increases with temperature; therefore, thermography allows one to see variations in temperature. When viewed through a thermal imaging camera, warm objects stand out well against cooler backgrounds; humans and other warm-blooded animals become easily visible against the environment, day or night. As a result, thermography is particularly useful to military and other users of surveillance cameras.

Thermography has a long history, although its use has increased dramatically with the commercial and industrial applications of the past fifty years. Government and airport personnel used thermography to detect suspected swine flu cases during the 2009 pandemic.Firefighters use thermography to see through smoke, to find persons, and to localize the base of a fire. Maintenance technicians use thermography to locate overheating joints and sections of power lines, which are a sign of impending failure. Building construction technicians can see thermal signatures that indicate heat leaks in faulty thermal insulation and can use the results to improve the efficiency of heating and air-conditioning units. Some physiological changes in human beings and other warm-blooded animals can also be monitored with thermal imaging during clinical diagnostics.

Matthew Knights (born 5 October 1970) is a former Australian rules football player, having played in the midfield for the Richmond Football Club from 1988 to 2002. He went on to a coaching career, most notably as head coach of the Essendon Football Club from 2008 to 2010. In 2011 Matthew Knights took a year off from coaching before being appointed Geelong VFL coach for season 2012

Knights wore the number 33 guernsey in 279 games between 1988-2002 for the Tigers whom he captained between 1997-2000. Playing in Richmond's midfield for the majority of his career, Knights was known for his ball winning ability if not his athleticism. Gifted with excellent "vision" or spacial awareness, and consistently reliable delivery from his left boot, given time and space Knights was one of the most damaging midfielders in the AFL throughout the 90s.

Though rewarded with numerous individual honors playing in a mediocre team, Knights made only two appearances with the Tigers in the AFL Finals Series in 1995 and 2001. He was placed top four in the team's annual best and fairest vote seven times between 1990 and 2000 and equal second in the Brownlow Medal count for 1995.