“…More recently, some work on the detection and segmentation of metallic objects has been proposed (Haworth et al, 2004(Haworth et al, , 2005 for the QinetiQ sensor. Work has also been presented on modelling image formation in the QinetiQ MMW sensor (Grafulla-González et al, 2005). Alternatively, image fusion (Varshney et al, 1999;Xue and Blum, 2003) has been employed on MMW/infrared.…”