1. An inspection system comprising: a. a radiation source; b. a detector array; c. an inspection region bounded by said radiation source and detector array; d. a processing unit, wherein, through operation of at least one processor, at least one memory, and programmatic instructions, said processing unit i. obtains data representative of a radiographic image; ii. segments said data based on radiation attenuation or transmission; iii. identifies at least one segmented area within said data representative of said radiographic image; iv. filters said at least one segmented area using at least one geometric filter; v. generates a plurality of feature vectors using said filtered segmented area; and vi. compares said feature vectors against predefined values to determine whether a high-atomic-number object is present.