29 January 1999 CFAR detection with non-Gaussian and dependent data
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Proceedings Volume 3584, 27th AIPR Workshop: Advances in Computer-Assisted Recognition; (1999) https://doi.org/10.1117/12.339833
Event: The 27th AIPR Workshop: Advances in Computer-Assisted Recognition, 1998, Washington, DC, United States
Abstract
The volume of video and other image data is expanding at a rapid pace with the increasing use of surveillance systems, unmanned vehicles, and other collection systems. The sheer volume of images requires the use of automatic systems to select interesting image features for further analysis. These systems should have a low false alarm rate, e.g. satisfying a pre-determined constant false alarm rate (CFAR). Various filters may be applied to filter out non- target (background) parts of an image. The output of these filters is noise, plus possible target features. When the noise is Gaussian, CFAR thresholds may be based on t- distributions, with reduced degrees of freedom in the case of correlated noise. For the non-Gaussian case, the use of t distributions is inappropriate, and we suggest alternatives based on parametric families of distributions, with location, scale, and shape parameters. When shape parameters are known the thresholds can be determined using a Monte Carlo technique, using variance reduction techniques to improve the computational efficiency by a factor of 1800. We discuss methods for handling unknown shape parameters.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tim C. Hesterberg, Tim C. Hesterberg, } "CFAR detection with non-Gaussian and dependent data", Proc. SPIE 3584, 27th AIPR Workshop: Advances in Computer-Assisted Recognition, (29 January 1999); doi: 10.1117/12.339833; https://doi.org/10.1117/12.339833
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