It may refer to one of two types of body imaging technologies used for security screening such as in airports:
The core of infra-red thermal difference detection is imaging which detects and processes a break in the established thermal balance between the clothes and a hidden object. The IR camera detects the heat radiating from even a tiny object, producing a dark/light shape. It is irrelevant how long an object is concealed under clothing as a new temperature imprint is created every time it is scanned.
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