1. A method of processing radiographic image data of an object, comprising: activating a radiation source; using a detector array, detecting radiation emitted from the radiation source and passing through an inspection volume and the object to generate data representative of a radiographic image; using a processor, processing said data representative of the radiographic image by generating a first map, using areas on said first map to generate a mask, and electronically cropping out portions of the radiographic image to yield a second map that highlights regions representative of potential threats, wherein the first map is generated by performing image segmentation, wherein said image segmentation is performed by determining local maximum attenuation values or minimum attenuation values of the radiographic image, and wherein a plurality of geometric filters is applied to the first map.