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DIGITAL ENHANCEMENT OF ACOUSTIC IMAGES

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HAL Id: jpa-00215131

https://hal.archives-ouvertes.fr/jpa-00215131

Submitted on 1 Jan 1972

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DIGITAL ENHANCEMENT OF ACOUSTIC IMAGES

M. Takagi, Nie Tse, J. Amuedo, G. Wade

To cite this version:

M. Takagi, Nie Tse, J. Amuedo, G. Wade. DIGITAL ENHANCEMENT OF ACOUSTIC IMAGES.

Journal de Physique Colloques, 1972, 33 (C6), pp.C6-59-C6-59. �10.1051/jphyscol:1972613�. �jpa-

00215131�

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JOURNAL DE PHYSIQUE

Colloque C6, supplkment au no 11-12, Tome 33, Novembre-Dtcembre 1972, page 59

DIGITAL ENHANCEMENT OF ACOUSTIC IMAGES

M. TAKAGI, N I E BUT TSE, J. W. AMUEDO and G. WADE

University of California, Department of Electrical Engineering Santa Barbara, California 93 106, U. S. A.

R6sumB. - Des techniques digitales ont kt6 utiliskes pour traiter, reproduire et agrandir des images obtenues dans un systhme B cellule de Bragg. Des techniques de filtrage sp6ciales ont 6t6 utilisks pour 6lirniner les bruits systkrnatiques, les ordres de diffraction parasites et le dkrkglage en focale des images. Ces techniques comprennent le filtrage par transformation de Fourier digi- tale, les moyennes de relaxation, le rGtalonnage des densit6s et la variation de modulation de la fonction de transfert. Les images sont visualisQs sur un tube cathodique contr616 par ordinateur.

Un appareil DEC PDP-15 a kt6 utilis6 pour traiter les images digitalement.

Abstract. -

Digital techniques have been employed to process, reproduce, and enhance images obtained from a Bragg cell system. Special filtering techniques have been utilized to eliminate systematic noise, spurious diffraction orders, and image defocusing. These techniques include spatial frequency filtering by digital Fourier transform, relaxation averaging density rescaling, and variation of the modulation transfer function. The images are displayed on a computer- controlled CRT A DEC PDP-15 was used to process the images digitally.

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1972613

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