Partial removal of correlated noise in thermal imagery

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Description

Correlated noise occurs in many imaging systems such as scanners and push-broom imagers. The sources of correlated noise can be from the detectors, pre-amplifiers and sampling circuits. Correlated noise appears as streaking along the scan direction of a scanner or in the along track direction of a push-broom imager. We have developed algorithms to simulate correlated noise and pre-filter to reduce the amount of streaking while not destroying the scene content. The pre- filter in the Fourier domain consists of the product of two filters. One filter models the correlated noise spectrum, the other is a windowing function e.g. Gaussian ... continued below

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8 p.

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Borel, C.C.; Cooke, B.J. & Laubscher, B.E. April 1, 1996.

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Description

Correlated noise occurs in many imaging systems such as scanners and push-broom imagers. The sources of correlated noise can be from the detectors, pre-amplifiers and sampling circuits. Correlated noise appears as streaking along the scan direction of a scanner or in the along track direction of a push-broom imager. We have developed algorithms to simulate correlated noise and pre-filter to reduce the amount of streaking while not destroying the scene content. The pre- filter in the Fourier domain consists of the product of two filters. One filter models the correlated noise spectrum, the other is a windowing function e.g. Gaussian or Hanning window with variable width to block high frequency noise away from the origin of the Fourier Transform of the image data. We have optimized the filter parameters for various scenes and find improvements of the RMS error of the original minus the pre-filtered noisy image.

Physical Description

8 p.

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INIS; OSTI as DE96009779

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  • 10. SPIE`s international symposium on aerospace/defense sensing and controls, Orlando, FL (United States), 8-12 Apr 1996

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  • Other: DE96009779
  • Report No.: LA-UR--96-929
  • Report No.: CONF-9604105--8
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 230545
  • Archival Resource Key: ark:/67531/metadc672993

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 25, 2016, 10:21 p.m.

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Borel, C.C.; Cooke, B.J. & Laubscher, B.E. Partial removal of correlated noise in thermal imagery, article, April 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc672993/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.