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Method for producing correct fingerprints.

S Madhusudana Rao1

  • 1Department of Instrumentation, Indian Institute of Science, Bangalore 560 012, India. madhu@isu.iisc.ernet.in

Applied Optics
|December 25, 2007
PubMed
Summary

A new optical method corrects fingerprint image distortion caused by total internal reflection. This technique uses a combined prism system to achieve true-size fingerprint imaging for CCD cameras.

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Area of Science:

  • Optics
  • Forensic Science
  • Imaging Technology

Background:

  • Conventional fingerprint imaging using total internal reflection with a right-angle prism produces images with incorrect size due to anamorphic distortion.
  • The Scheimpflug condition, while used in optical systems, can introduce keystone distortion in fingerprint images.

Purpose of the Study:

  • To describe a novel optical method for obtaining true-size fingerprint images.
  • To address the limitations of existing total internal reflection fingerprint imaging techniques.

Main Methods:

  • A method involving the combination of a single prism with a standard right-angle prism is proposed.
  • This combined prism system is designed for anamorphic stretching to correct image distortion.
  • Detailed discussion on the construction of this specific optical system is provided.

Main Results:

  • The proposed method effectively corrects the anamorphic real image distortion.
  • True-size fingerprint images are obtained, overcoming the limitations of the conventional approach.
  • The system facilitates direct fingerprint acquisition using a CCD camera.

Conclusions:

  • The described optical system provides a practical solution for accurate fingerprint size reproduction.
  • This method enhances the reliability of fingerprint analysis and identification.
  • The technique is valuable for direct, distortion-free fingerprint capture with digital cameras.

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