DEVICE FOR EXTRACTING A DENSITY AS ONE OF A NUMBER OF PATTERN FEATURES EXTRACTED FOR EACH FEATURE POINT OF A STREAKED PATTERN

摘要

In addition to positions and directions of feature points of a streaked pattern, such as minutiae of a fingerprint on a background, a plurality of novel counts and a density are automatically extracted for each feature point selected as a reference feature point. The density is determined in connection with adjacent feature points that are present in a predetermined neighborhood of the reference feature point. Each count is decided by the number of streaks or ridges intervening between the reference feature point and a related feature point that is nearest to the reference feature point among the feature points in a predetermined sector of the neighborhood.