A system and method for autonomous concealed object detection and threat assessment. Image data is received from a millimeter wave imaging device comprising at least one scan of a scene. The image data is enhanced thereby creating enhanced image data comprising a plurality of enhanced image pixels. The enhanced image data is evaluated thereby identifying at least one subject within the enhanced image data. The subject is separated from a background within the enhanced image data. The contrast of the subject is enhanced within the enhanced image data. Concealed physical objects associated with the subject within the enhanced contrast image data are detected, thereby detecting at least one concealed object associated with the subject. A representation of the subject and the concealed physical object is displayed on a display device.