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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Integrisana multiveličinska obrada radiografskih snimaka / Integrated multi-scale radiography image processing

Ostojić Vladimir 21 September 2018 (has links)
<p>Predložena je multiveličinska obrada kojom je moguće objediniti pojačanje<br />vidljivosti detalja kao i poboljšanje kontrasta radiografskih snimaka, kojim<br />se uspostavlja ravnoteža između kontrasta slabo i jasno vidljivih struktura.<br />Pored toga, obradom je obuhvaćeno i smanjenje globalnog kontrasta, čime je<br />moguće dodatno naglasiti lokalne strukture. Drugim rečima, predložena je<br />multiveličinska obrada koja integriše sve korake poboljšanja vidljivosti<br />anatomskih struktura. Predložena obrada razmotrena je u okviru razvijenog<br />algoritamskog okvira koji sadrži korake obrade radiografskih snimaka koji su<br />potrebni da bi se sirov signal, dobijen od strane detektora zračenja, obradio<br />i time pripremio za prikazivanje lekarima. Svaki od koraka obrade je<br />analiziran i predložena su originalna rešenja, kao i poboljšanja postojećih<br />pristupa. Evaluacijom je pokazano se integrisanom obradom postižu rezultati<br />koji prevazilaze one koji se dobijaju savremenom vrhunskom obradom, kao i da je<br />celokupni proces obrade moguće kontrolisati sa samo dva operativna<br />parametra. Da bi se upotpunila sveobuhvatna analiza procesa obrade<br />radiografskih snimaka, u disertaciji je razmotreno i uklanjanje artefakata<br />nastalih obradom, kao i mogućnost ubrzanja obrade radiografskih snimaka. Za<br />oba problema su ponuđena originalna rešenja čija je efikasnost<br />eksperimentalno potvrđena.</p> / <p>The thesis focuses on digital radiography image processing. Multi-scale processing is<br />proposed, which unifies detail visibility enhancement, local contrast enhancement and<br />global contrast reduction, thus enabling additional amplification of local structures. In<br />other words, the proposed multi-scale image processing integrates all steps of<br />anatomical structures visibility enhancement. For the purpose of the proposed<br />anatomical structures visibility enhancement analysis, a processing framework was<br />developed. The framework consists of several stages, used to process the image from<br />its raw form (signal obtained from the radiation detector), to the state where it will be<br />presented to the medical diagnostician. Each stage is analyzed and for each an<br />original solution or an improvement of an existing approach was proposed. Evaluation<br />has shown that integrated processing provides results which surpass state-of-the-art<br />processing methods, and that the entire processing pipeline can be controlled using<br />just two parameters. In order to complete the comprehensive analysis of radiography<br />image processing, processing artifacts removal and radiography image processing<br />acceleration are analyzed in the thesis. Both issues are addressed through original<br />solutions whose efficiency is experimentally confirmed.</p>

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