Visible defects in night vision device (NVD) images, arising from image intensifier (I~2) tube defects and dirt on the device's optics, can become more than cosmetic blemishes. They can act as visual distractions and may be large enough to mask critical informaiton pilots need to conduct normal night vision operations. this paper is concerned with the assessment of NVD dark spots. Current methods of assessing dark spots examine only the image intensifier tube, ignoring spots due to dirt and dust introduced during night vision device assembly. Current methods are limited in the size of spot that can be counted and do not address the issue of spot contrast. This apepr discusses a photographic method for classifying, locating, and counting dark spots in an assembled night vision device.
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