We present the design and evaluation of a new demonstrator rifle sight viewing system containing direct view, red aim
point and fusion of an (uncooled, LWIR) thermal sensor with a digital image intensifier. Our goal is to create a system
that performs well under a wide variety of (weather) conditions during daytime and nighttime and combines the
advantages of the various sensor systems. A real-time colour image with salient hot targets is obtained from the night
vision sensors by implementing the Colour-the-Night fusion method (Hogervorst & Toet, 2010) on the on-board
processor. The prototype system was evaluated in a series of field trials with military observers performing detection and
identification tasks. The tests showed that during daytime the addition of a thermal image to direct vision is
advantageous, e.g. for the detection of hot targets. At nighttime, the fusion of thermal and image intensified imagery
results in increased situational awareness and improved detection of (hot) targets. For identification of small (handheld)
objects, the technology needs to be further refined.
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