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Analiza in uporaba metode korelacije digitalnih slik na primeru virtualnega digitalnega dvojčka
ID Džombić, Ines (Author), ID Starman, Bojan (Mentor) More about this mentor... This link opens in a new window, ID Halilovič, Miroslav (Comentor)

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Abstract
Naloga obravnava metodo digitalne korelacije slik (DIC) za določanje polj pomikov in deformacij na podlagi sivinskih vrednosti zaporedja slik. V okolju Wolfram Mathematica je bila razvita lastna implementacija korelacijskega postopka, pri čemer je bilo ujemanje podobmočij vrednoteno s kriterijem ZNSSD. Pravilnost algoritma je bila preverjena na sintetično deformiranih slikah z vnaprej znanimi referenčnimi parametri translacije in raztezka, kar je omogočilo neposredno kvantifikacijo napak. Rezultati osnovne metode brez interpolacije so pokazali pravilno sledenje trendom, vendar omejeno natančnost zaradi celoštevilskih premikov. Z uvedbo sub-pikselnih pristopov in primerjavo z rezultati programa MatchID je bila potrjena skladnost izračunov ter identificirani ključni vplivi izbranih parametrov analize.

Language:Slovenian
Keywords:metoda korelacije digitalnih slik (DIC), polja deformacij, podobmočja, korelacijski kriterij ZNSSD, resolucija znotraj slikovne točke, interpolacija, optimizacija, sintetično deformirane slike
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Year:2026
Number of pages:XIV, 37 f.
PID:20.500.12556/RUL-179797 This link opens in a new window
UDC:004.942:519.23:620.172.21(043.2)
COBISS.SI-ID:269694979 This link opens in a new window
Publication date in RUL:25.02.2026
Views:333
Downloads:216
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Secondary language

Language:English
Title:Analysis and application of digital image correlation method using digital virtual twin
Abstract:
This thesis addresses the digital image correlation (DIC) method for determining displacement and strain fields based on grayscale values from an image sequence. A dedicated correlation workflow was developed in Wolfram Mathematica, with subset matching evaluated using the ZNSSD criterion. The algorithm was validated on synthetically deformed images with predefined reference parameters for translation and stretching, enabling direct error quantification. The results of the basic approach without interpolation captured the expected trends, yet exhibited limited accuracy due to integer-pixel displacement estimates. With the introduction of sub-pixel procedures and a comparison against the MatchID software, the consistency of the computed results was confirmed and the key influences of analysis parameters were identified.

Keywords:digital image correlation (DIC), strain fields, subsets, ZNSSD correlation criterion, sub-pixel resolution, interpolation, optimization, synthetically deformed images

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