Automatic detection of targets in natural terrain images is a difficult problem when the size and brightness of the targets is similar to that of the background clutter. The best results are achieved by techniques that are built on modeling the images as a stochastic process and detection as a problem in statistical decision theory. The current paper follows this approach in developing a new stochastic model for images of natural terrain and introducing some novel detection techniques for small targets that are based on hypothesis testing of neighborhoods of pixels. The new stochastic model assumes the observed image to be a pointwise transform of an underlying stationary Gaussian random field. This model works well in practice for a wide range of electro-optic and synthetic aperture radar (SAR) natural images. Furthermore the model motivates the design of target detection algorithms based on hypothesis tests of the likelihood of pixel neighborhoods in the underlying Gaussian image. We have developed a suite of detection algorithms with this model, and have trained them on ensembles of real infra-red and SAR images containing small artificially inserted targets at random locations. Receiver operating characteristics (ROCs) have been compiled, and the dependence of detection statistics on the target to background contrast ratio has been explored.


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    Title :

    Target detection in infrared and SAR terrain images using a non-Gaussian stochastic model


    Contributors:
    Chapple, P.B. (author) / Bertilone, D.C. (author) / Caprari, R.S. (author) / Angeli, S. (author) / Newsam, G.N. (author)


    Publication date :

    1999


    Size :

    11 Seiten, 17 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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