In this paper a knowledge base driven technique is presented to detect targets based on the geometric properties of the "shadows" cast by the targets in laser radar (LADAR) range images. The geometric properties of the shadows are relatively easy to compute and are less susceptible to target obscuration. In this technique synthetic images of targets are utilized to populate the knowledge base. The validity of the approach is demonstrated by detecting an armed personnel carrier and a tank utilizing data from captive flight tests.
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