Abstract: Surveilling a subject may include irradiating a portion of the subject with electromagnetic radiation, receiving radiation reflected from the subject, and producing digital image data representative of an image of the portion of the subject. The digital image data may be used as input for computations including image processing and/or analysis, and the result of such processing and/or analysis may be used to make determinations about the subject, such as whether subject is carrying contraband. In some embodiments, the digital image data may be upsampled into expanded digital image data, which may improve the quality and/or effectiveness of downstream image processing and/or analysis.