FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W970654231> ?p ?o ?g. }

• W970654231 abstract "In this thesis, some efficient methods for acoustic image enhancement and automatic object detection are presented and assessed on a specific class of real data. The aim is to increase the potentiality of mechanically scanned fanshaped-beam and pencil-beam sonar systems employed during underwater operations. Concerning the fan-shaped-beam sonar system, a set of methods has been assessed that is devoted to increase the visual quality of the generated images. The first step is a scan conversion procedure, to move from a polar coordinate system as that of the sonar to a dense, regular matrix of pixels. An efficient interpolation step, working on the same polar coordinates of the sonar system, has been developed, that performs the computation of the value to assign to every pixel on the basis of the weighted average of the neighboring acoustic samples. Moreover, a dynamic pixel brightness assignment law, evaluated image by image, is carried out to optimally exploit the available brightness range. The joint application of the interpolation method and the optimized brightness assignment allows one to improve image quality thus providing a simple and effective tool to generate particularly refined acoustic images. Finally, further processing steps allow to reduce typical problems blurring this kind of imaging systems, like speckle noise, multiple echoes and low contrast. Concerning the pencil-beam sonar system, two methods are proposed and assessed that allow the detection of a simple object contained in the imaged region. In particular, one of these methods is novel and has been devised ad-hoc to advantageously exploit the specific data organization that characterizes the pencil-beam sonar system. Satisfactory outcomes in terms of accuracy in object location and computational load are achieved. The real-time requirement can be easily satisfied by using a common personal computer. The performance of the proposed techniques has been evaluated using real data collected by the addressed sonar heads during different trials at sea." @default.
• W970654231 created "2016-06-24" @default.
• W970654231 creator A5023785382 @default.
• W970654231 creator A5068817748 @default.
• W970654231 creator A5089107472 @default.
• W970654231 date "2009-02-20" @default.
• W970654231 modified "2023-09-27" @default.
• W970654231 title "Evaluación experimental de métodos de mejoramiento de imágenes y detección de objetos aplicados a sistemas sonar de barrido mecánico" @default.
• W970654231 cites W1659945791 @default.
• W970654231 cites W2097066234 @default.
• W970654231 cites W2113745526 @default.
• W970654231 cites W2114551416 @default.
• W970654231 cites W2135271508 @default.
• W970654231 cites W2168265940 @default.
• W970654231 cites W2169447236 @default.
• W970654231 hasPublicationYear "2009" @default.
• W970654231 type Work @default.
• W970654231 sameAs 970654231 @default.
• W970654231 citedByCount "0" @default.
• W970654231 crossrefType "journal-article" @default.
• W970654231 hasAuthorship W970654231A5023785382 @default.
• W970654231 hasAuthorship W970654231A5068817748 @default.
• W970654231 hasAuthorship W970654231A5089107472 @default.
• W970654231 hasConcept C115961682 @default.
• W970654231 hasConcept C120665830 @default.
• W970654231 hasConcept C121332964 @default.
• W970654231 hasConcept C125245961 @default.
• W970654231 hasConcept C137800194 @default.
• W970654231 hasConcept C154945302 @default.
• W970654231 hasConcept C160633673 @default.
• W970654231 hasConcept C31972630 @default.
• W970654231 hasConcept C41008148 @default.
• W970654231 hasConcept C555745239 @default.
• W970654231 hasConceptScore W970654231C115961682 @default.
• W970654231 hasConceptScore W970654231C120665830 @default.
• W970654231 hasConceptScore W970654231C121332964 @default.
• W970654231 hasConceptScore W970654231C125245961 @default.
• W970654231 hasConceptScore W970654231C137800194 @default.
• W970654231 hasConceptScore W970654231C154945302 @default.
• W970654231 hasConceptScore W970654231C160633673 @default.
• W970654231 hasConceptScore W970654231C31972630 @default.
• W970654231 hasConceptScore W970654231C41008148 @default.
• W970654231 hasConceptScore W970654231C555745239 @default.
• W970654231 hasLocation W9706542311 @default.
• W970654231 hasOpenAccess W970654231 @default.
• W970654231 hasPrimaryLocation W9706542311 @default.
• W970654231 isParatext "false" @default.
• W970654231 isRetracted "false" @default.
• W970654231 magId "970654231" @default.
• W970654231 workType "article" @default.