No, if a room never had any light source within it, an infrared camera would not be able to capture any meaningful images. Infrared cameras rely on the detection of infrared radiation, which is emitted or reflected by objects in the environment.
In a completely dark room without any light sources, there would be no infrared radiation available for the camera to detect. Infrared radiation is typically emitted by objects due to their temperature, with warmer objects emitting more infrared radiation. However, if the room is at the same temperature as the camera or colder, there would be no significant infrared emissions.
It's important to note that infrared cameras, often referred to as thermal cameras, can detect heat signatures or temperature differences even in the absence of visible light. However, this relies on temperature variations in the environment or on the objects themselves, rather than the complete absence of light.
In summary, if a room has no light source and is at the same temperature as the camera or colder, an infrared camera would not be able to capture meaningful images since there would be no significant infrared radiation to detect.