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Multidimensional Digital Filters for Point-Target Detection in Cluttered Infrared Scenes

Authors
  • Kennedy, Hugh L.
Type
Published Article
Publication Date
Jan 16, 2015
Submission Date
Aug 11, 2014
Identifiers
DOI: 10.1117/1.JEI.23.6.063019
Source
arXiv
License
Yellow
External links

Abstract

A 3-D spatiotemporal prediction-error filter (PEF), is used to enhance foreground/background contrast in (real and simulated) sensor image sequences. Relative velocity is utilized to extract point-targets that would otherwise be indistinguishable on spatial frequency alone. An optical-flow field is generated using local estimates of the 3-D autocorrelation function via the application of the fast Fourier transform (FFT) and inverse FFT. Velocity estimates are then used to tune in a background-whitening PEF that is matched to the motion and texture of the local background. Finite-impulse-response (FIR) filters are designed and implemented in the frequency domain. An analytical expression for the frequency response of velocity-tuned FIR filters, of odd or even dimension, with an arbitrary delay in each dimension, is derived.

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