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usnistgov / NFIQ2

Optical live-scan and ink fingerprint image quality assessment tool
https://www.nist.gov/services-resources/software/development-nfiq-20
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DFT Windowing #356

Open gfiumara opened 1 year ago

gfiumara commented 1 year ago

The DFT of an at most 32-element vector and expected frequency of 1/10 will be heavily dominated by border effects. We should use windowing.

Source: Comment DE-083 from ISO/IEC JTC 1/SC 37/WG 3 N 1416 (Clause 5.2.4.3)

gfiumara commented 1 year ago

Via Sven Utcke, good rationale for windowing: http://www.ee.ic.ac.uk/pcheung/teaching/de2_ee/Lecture%205%20-%20DFT%20&%20Windowing%20(x2).pdf