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Author

Nikos Giakoumoglou

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#artificial intelligence Preprint Aug 2026

Open-World Semantic Segmentation with Sensitivity Modeling

This work addresses open-world semantic segmentation, the joint task of segmenting known classes while detecting and grouping novel or anomalous content without additional supervision, by extending a dual-decoder baseline with a third, complementary decoder within a unified encoder-decoder design.

Anastasios Romanos Varvarigos, Nikos Giakoumoglou, Tania Stathaki · 0 citations
#artificial intelligence Preprint Sep 2026

ViTAMINS: An Empirical Study of Training Self-Supervised Vision Transformers with Synthetic Hard Negatives

This work introduces ViTAMINS, a method that integrates synthetic hard negatives into unsupervised vision transformer pretraining to improve representation quality and motivate reconsidering contrastive learning as a simpler yet powerful alternative to dominant generative and self-distillation approaches.

Nikos Giakoumoglou, Andreas Floros, K. Papadopoulos et al. · 0 citations
#machine learning Preprint Aug 2026

Three Necessary Principles for Self-Supervised Visual Representation Learning

We argue that learning visual representations without labels requires a training signal jointly complete across three non-overlapping objectives: semantic invariance across augmented views, patch-level spatial prediction, and representational non-degeneracy. We formalize these as the observation, prediction, and regula...

Nikos Giakoumoglou, Paschalis Giakoumoglou, Tania Stathaki · 0 citations

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