Thermal Video, Thermal Imaging or Thermography, is a type of infrared imaging. Thermal camera sensors detect heat in the infrared range of the electromagnetic spectrum (roughly 900–14,000 nanometers or 0.9–14 µm) and produce color or black and white images from heat signatures.

Thermal infrared imagers convert energy in the infrared wavelength into a visible light video display. All objects above 0° Kelvin emit thermal infrared energy so thermal imagers can passively see all objects regardless of ambient light.