1,720,988 research outputs found
Ship detection in SAR images: A segmentation-based approach
No full textThis paper deals with the problem of detecting ship targets in medium and high resolution SAR images. Achieving a controlled false alarm rate is a major problem for the presence of a highly non-homogeneous sea clutter environment due to the highly variable environmental and weather conditions in closely spaced areas. After highlighting the problems of conventional techniques, a new approach is proposed based on cascading a segmentation stage and a local CFAR detection stage. The former estimates the homogeneous back-scattering regions, while the latter detects the ship targets inside the fairly homogeneous identified regions
Valutazione delle riserve del bacino estrattivo del travertino romano: influenza dei vincoli territoriali e della dinamica della coltivazione
No full textL'Industria del travertino romano e le altre attività estrattive nel territorio dei Comuni di Guidonia M.C., S. Angelo R. e Tivoli. P.R. n.6 PRAE. Tavole
No full textSegmentation-based technique for ship detection in SAR Images
No full textA novel segmentation-based ship detection scheme is proposed to cope with the typical features of sea clutter. In particular, it is shown that the standard 2D-CFAR schemes applied to both low- and high-resolution SAR images do not allow adequate control of the false-alarm rate for nonhomogeneity and non-gaussianity characteristics of back-scattering from the sea. The introduction of an appropriate first segmentation stage allows standard CFAR techniques to be applied inside homogeneous areas. Moreover, the derived approximate CFAR performance against non-gaussian clutter allows the detection threshold to be set to achieve the desired false alarm rate. The practical performance is demonstrated for both a set of low-resolution quick-look ERS-SAR images and a set of high-resolution single-look X-SAR/SIR-C images. This proved that the proposed segmentation-based scheme gives a very high ship detection capability for both sets, with a controlled number of false alarms in the presence of any structure or fluctuation of the background
Les problemes et les mesures a prendre pour coordonner l'ex¬ploitation des granulats et l'amenegement urbain dans les alen¬tour de Rome (Italy). Int. Symp. sur les granulats. Nice (France) 21-23 Mai 1984
No full textSul reperimento di siti di coltivazione delle sabbie e delle ghiaie alternativi all'estrazione dall'alveo del Tevere
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