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Depth of field improvements and automatic focusing in long wavelength imaging systems / Ahmed Yamani

Public ISBD Titre : Depth of field improvements and automatic focusing in long wavelength imaging systems Type de document : texte imprimé Auteurs : Ahmed Yamani, Auteur ; Benson, F. A, Directeur de thèse Editeur : Sheffield : [s.n.] Année de publication : 1984 Importance : 168 f. Présentation : ill. Format : 30 cm. Note générale : PhD Thesis : Electronics : University of Sheffield : 1984 Bibliogr. f. 164 - 168 Langues : Anglais (eng) Mots-clés : Imaging  systems Field  improvements Long  wavelength Index. décimale : D004284 Résumé : A novel approach to the depth of field limitations associated with backward propagation techniques is developed. The new technique does not require prior object range information to reconstruct simultaneous in-focus images of targets situated at widely different ranges. furthermore, the distortion associated with backward wave propagation is removed when this technique is used. Although the proposed procedure is multifrequency in nature, the bandwidth used is shown to be well within that of a typical transducer and, thus, it can be used in other imaging systems operating in either the electromagnetic or acoustic regimes. Depth of field improvements and automatic focusing in long wavelength imaging systems [texte imprimé] / Ahmed Yamani, Auteur ; Benson, F. A, Directeur de thèse . - Sheffield : [s.n.], 1984 . - 168 f. : ill. ; 30 cm. PhD Thesis : Electronics : University of Sheffield : 1984 Bibliogr. f. 164 - 168 Langues : Anglais (eng) Mots-clés : Imaging  systems Field  improvements Long  wavelength Index. décimale : D004284 Résumé : A novel approach to the depth of field limitations associated with backward propagation techniques is developed. The new technique does not require prior object range information to reconstruct simultaneous in-focus images of targets situated at widely different ranges. furthermore, the distortion associated with backward wave propagation is removed when this technique is used. Although the proposed procedure is multifrequency in nature, the bandwidth used is shown to be well within that of a typical transducer and, thus, it can be used in other imaging systems operating in either the electromagnetic or acoustic regimes.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
D004284B	D004284	Papier	Bibliothèque centrale	Thèse de Doctorat	Disponible
D004284A	D004284	Papier	Bibliothèque centrale	Thèse de Doctorat	Disponible