Point target detection in segmented images

D. Avraham, N. Belagus, S. R. Rotman

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations


Hyperspectral images are used for anomaly detection; the improvement over broadband imagery is due to the available spectral information, converting a two-dimensional image into a datacube. This paper deals with subpixel point target detection. The RX algorithm provides a statistical metric for how different an examined pixel is from the background in the data cube. It employs an inverse covariance matrix to estimate and limit the effect of the noise, which is normally estimated from all the pixels in the data cube. Since the background is non-stationary, an improvement in the detection performance can be achieved by segmentation. The first objective of this paper is to quantify in the algorithm the effect of using covariance matrices which are derived from the segments or the more local environments in which the pixel can be found. In addition, practically, pixels may be erroneously assigned to a specific segment though they are influenced by neighboring areas. We will examine different methods of choosing the "pure" pixels of each segment, and the influence of these methods on the probability of detection results.

Original languageEnglish
Title of host publicationImaging Spectrometry XIII
ISBN (Print)9780819473066
StatePublished - 1 Jan 2008
EventImaging Spectrometry XIII - San Diego, CA, United States
Duration: 12 Aug 200813 Aug 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceImaging Spectrometry XIII
Country/TerritoryUnited States
CitySan Diego, CA


  • Hyperspectral
  • Matched filter
  • RX algorithm
  • Segmentation
  • Target detection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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