G PHYSICS
G06 COMPUTING OR CALCULATING; COUNTING
G06V IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
40/00 Recognition of biometric, human-related or animal-related patterns in image or video data
G06V40/10 Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
G06V40/12 Fingerprints or palmprints
G06V40/1347 Preprocessing; Feature extraction
G06V40/1359 Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop