title: Method for producing correct fingerprints.
abstract: The conventional method of producing fingerprints by total internal reflection using a right-angle prism does not give true size images. In this case an anamorphic real image is formed by the Scheimpflug condition with keystone distortion. A method of combining a single prism with the right-angle prism for anamorphic stretching to get the correct fingerprint image is described. The method of constructing such a type of an optical system is discussed in detail. The method is useful to directly obtain the correct fingerprints using a CCD camera.
authors.affiliation: Department of Instrumentation, Indian Institute of Science, Bangalore 560 012, India. madhu@isu.iisc.ernet.in
authors.forename: S Madhusudana
authors.initials: SM
authors.lastname: Rao
mesh_terms: D000465:Algorithms; D016477:Artifacts; D003878:Dermatoglyphics / Q000145:classification*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D010783:Photometry / Q000379:methods*; D012031:Refractometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity