1. An imaging target detection system comprising: scanner means for producing an image of a target area; target discriminator means including target segmentation means for identifying image pixels of similar intensity levels; target regionalization means for grouping into regions contiguous pixels of similar intensity levels; means for calculating a set of features for each target region; and means, responsive to said features, for qualifying regions as target candidates; background discriminator means including background segmentation means for identifying image pixels of similar intensity levels; background regionalization means for grouping into regions contiguous pixels of similar intensity levels; means for calculating a set of features for each background region; and means, responsive to said features, for qualifying background regions as terrain characteristics; and image analysis logic means responsive to said qualified terrain characteristics and qualified target candidates for determining and prioritizing targets.