Closer Look at the Uncertainty Estimation in Semantic Segmentation under Distributional Shift - Publication - Bridge of Knowledge

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Closer Look at the Uncertainty Estimation in Semantic Segmentation under Distributional Shift

Abstract

While recent computer vision algorithms achieve impressive performance on many benchmarks, they lack robustness - presented with an image from a different distribution, (e.g. weather or lighting conditions not considered during training), they may produce an erroneous prediction. Therefore, it is desired that such a model will be able to reliably predict its confidence measure. In this work, uncertainty estimation for the task of semantic segmentation is evaluated under a varying level of domain shift: in a cross-dataset setting and when adapting a model trained on data from the simulation. It was shown that simple color transformations already provide a strong baseline, comparable to using more sophisticated style-transfer data augmentation. Further, by constructing an ensemble consisting of models using different backbones and/or augmentation methods, it was possible to improve significantly model performance in terms of overall accuracy and uncertainty estimation under the domain shift setting. The Expected Calibration Error (ECE) on challenging GTA to Cityscapes adaptation was reduced from 4.05 to the competitive value of 1.1. Further, an ensemble of models was utilized in the self-training setting to improve the pseudo-labels generation, which resulted in a significant gain in the final model accuracy, compared to the standard fine-tuning (without ensemble).o

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Publication version
Accepted or Published Version
DOI:
Digital Object Identifier (open in new tab) 10.1109/IJCNN52387.2021.9533330
License
Copyright (2021 IEEE)

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Details

Category:
Conference activity
Type:
publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
Language:
English
Publication year:
2021
Bibliographic description:
Cygert S., Czyżewski A., Wróblewski B., Słowiński R., Woźniak K.: Closer Look at the Uncertainty Estimation in Semantic Segmentation under Distributional Shift// / : , 2021,
DOI:
Digital Object Identifier (open in new tab) 10.1109/ijcnn52387.2021.9533330
Sources of funding:
Verified by:
Gdańsk University of Technology

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