Category Archives: Fingerprints



Tara Fikes was recently honored at the Northeastern Association of Forensic Scientists Anuual 2011 meeting, receiving the “Best Poster” award for research entitled “Fast Fourier Transformation and Frequency Filtering to Suppress Background Noise in Fingerprint Evidence”.   Congratulations, Tara!

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Posted by on December 10, 2011 in Fingerprints


Fingerprints & Fourier Transformations

Frequency Filtering of Fingerprints to Remove Noisy Backgrounds

The Fourier transformation (FT) of an image allows selective filtering of frequencies associated with noisy backgrounds; the end result is a cleaner filtered image.

The image shown here illustrates the utility of the filtering process, beginning with a photograph of a fingerprint (topmost  image, Ref. Fikes, T. (2011)), the FT power spectrum and four filters that remove frequencies associated with the interfering vertical lines (center image), followed by the inverse transformation (bottom image), or a cleaned-up version of the original fingerprint.  Elliptical regions highlight frequences that have been removed by the filtering process.

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Posted by on August 1, 2011 in Fingerprints