1. A system comprising: a visible spectrum imaging module configured to capture a visible spectrum image of a scene at a first time; an infrared imaging module configured to capture an infrared image of the scene at a second time, wherein the infrared image comprises a radiometric component; and a processor in communication with the visible spectrum imaging module and the infrared imaging module and configured to process the visible spectrum image and the infrared image to generate a combined image comprising visible spectrum characteristics of the scene derived from the visible spectrum image and infrared characteristics of the scene derived from the radiometric component of the infrared image.