In this paper the design and development of a small-aperture imaging system used for surveillance of vehicular traffic at night is discussed. Such a sensor may have applicability to the safeguarding of a secure facility, where it is important to monitor vehicle activity near the facility perimeter. The sensing element is a linear pyroelectric focal plane array. Motion of a target vehicle provides for scanning in the horizontal direction, and negates the need for a chopper to produce a differential IR signal. Also presented are various digital image processing procedures that are employed to enhance the collected image data, since the images produced by such an array are qualitatively quite different than those obtained in the visible portion of the spectrum. The array consists of 32 lithium tantalate (LiTaO3) elements spaced on 15 mil centers on a single crystal, with element dimensions of 13 by 32 mils. Thirty-two individual on-chip hybrid detector pre-amplifiers reduce the large switching noise that would accompany post-multiplexer amplification. Processed images collected with this prototype system are shown.