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Zaznavanje sprememb v radarskih slikah z globokim učenjem
ID Kralj, Nika (Author), ID Čehovin Zajc, Luka (Mentor) More about this mentor... This link opens in a new window, ID Rolih, Blaž (Comentor)

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Abstract
Tehnologija SAR omogoča opazovanje zemeljskega površja neodvisno od osvetlitve in oblačnosti. Zaradi načina zajema in značilnosti radarskega povratnega sipanja se posnetki SAR bistveno razlikujejo od optičnih posnetkov, zato se pri uporabi metod globokega učenja pojavi vprašanje, v kolikšni meri so potrebne domensko specifične prilagoditve. V diplomskem delu to vprašanje obravnavamo v okviru problema dvočasovnega zaznavanja poplav na posnetkih Sentinel-1 iz podatkovne množice OMBRIA. Arhitekturo BTC prilagodimo za uporabo s podatki SAR in vanjo vključimo temeljni model Copernicus-FM. Eksperimentalno ovrednotimo vpliv različnih podatkovnih augmentacij ter preverimo, ali se njihova fizikalna smiselnost z vidika zajema SAR odraža v uspešnosti modela. Rezultati ne pokažejo jasne povezave med fizikalno smiselnostjo augmentacij in njihovo uspešnostjo. Najboljša kombinacija, ki vključuje tudi fizikalno vprašljive transformacije, doseže povprečje F1 = 0,8529. Dodatna primerjava konfiguracij kodirnika pokaže, da najvišjo uspešnost doseže kodirnik z arhitekturo Swin-T, prednaučen na optičnih slikah.

Language:Slovenian
Keywords:SAR, globoko učenje, podatkovne augmentacije, daljinsko zaznavanje, zaznavanje sprememb
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FRI - Faculty of Computer and Information Science
Year:2026
PID:20.500.12556/RUL-186631 This link opens in a new window
COBISS.SI-ID:291388419 This link opens in a new window
Publication date in RUL:03.09.2026
Views:183
Downloads:61
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Secondary language

Language:English
Title:Deep learning for change detection in radar images
Abstract:
Synthetic Aperture Radar (SAR) enables Earth surface observation regardless of illumination conditions or cloud cover. Due to the process of image acquisition and the characteristics of radar backscatter, SAR imagery differs substantially from optical imagery, raising the question of the extent to which domain-specific adaptations are necessary when applying deep learning methods. In this thesis, we examine this question in the context of bitemporal food detection using Sentinel-1 imagery from the OMBRIA dataset. We adapt the BTC architecture to SAR imagery and integrate it with the Copernicus-FM foundation model. We experimentally evaluate the impact of different data augmentation techniques and examine whether their physical plausibility with respect to SAR image acquisition is reflected in model performance. The results show no clear relationship between the physical plausibility of the augmentations and their effectiveness. The best-performing combination, which also includes transformations that are physically questionable in the context of SAR, achieves an average F1 = 0.8529. An additional comparison of encoder configurations shows that the best performance is achieved by a Swin-T encoder pretrained on optical imagery

Keywords:SAR, deep learning, data augmentation, remote sensing, change detection

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