GLIMS-MedNeXt
Brain tumor segmentation under domain shift

PhD Student and Researcher · Computer Vision
I build and evaluate computer vision and multimodal models—from brain MRI segmentation to synthetic facial data and vision–language understanding.
One question. Three connected directions.
How can a model generalize responsibly when the real world does not match its training set?

Research imagery is conceptual, not experimental output.

Medical image analysis
Brain MRI segmentation across high- and low-quality imaging domains.
Beyond clean benchmarks
I explore transfer learning, ensemble models, and conformal risk control to study reliability under domain shift.

Facial analysis & synthetic data
Understanding expressions through real and synthetic visual data.
Learning from generated data
Privacy-aware facial expression recognition and text-guided expression generation using vision-language and generative models, synthetic data, and cross-dataset evaluation.

Multimodal visual understanding
Connecting what a model sees with what language means.
Visual + language
Vision-language models and visual-textual cross-attention for multimodal reasoning, including IMMCAN idiom understanding and open-world text-guided visual counting.
Technical Expertise
Build training and evaluation pipelines for image segmentation, facial expression recognition, and multimodal representation learning. Adapt pretrained models, compare architectures, and evaluate generalization across datasets.
Run GPU-based research workflows in Python and PyTorch, with medical-image processing in MONAI and experiments on Linux and HPC systems. Analyze accuracy, segmentation quality, uncertainty, and failure cases.
Language + vision
My applied work connects language representations with visual tasks: image ranking, idiom understanding, and text-guided facial expression generation.
Explore the IMMCAN case studyAdditional areas of knowledge include large language models and retrieval-augmented generation (RAG), alongside graduate study in NLP, advanced NLP, and generative AI.
Selected project case studies
Brain tumor segmentation under domain shift
Learning facial expressions from synthetic data
Connecting idioms, captions, and images
Selected publications
Peer-reviewed work and open research across medical vision, facial analysis, multimodal reasoning, and visual counting.
2026 IEEE 20th International Conference on Automatic Face and Gesture Recognition (FG) · 2026
Kyoto, Japan · pp. 1–10 · First author
Evaluates pseudo-labeling, diffusion synthesis, and GAN expression editing for facial expression recognition, including how synthetic and real data combine under cross-dataset evaluation.
Proceedings of the 22nd Workshop on Multiword Expressions (MWE 2026) · 2026
Association for Computational Linguistics · pp. 149–153 · Equal contribution with Barış Bilen
Studies multilingual image ranking using frozen language and vision–language encoders with a trainable cross-attention module. Visual grounding improves zero-shot transfer, while text-only modeling performs better on the smaller in-domain test.
Segmentation, Classification, and Synthesis for Brain Tumors and Traumatic Brain Injuries · 2026
MICCAI 2025 challenges: BraTS-Lighthouse · LNCS 16376 · Springer, 2026 · pp. 262–273 · First author
Combines GLIMS and MedNeXt with pretraining, fine-tuning, and ensemble fusion for brain-tumor segmentation in lower-quality MRI.
Computer Vision and Image Understanding · 2026
Volume 267 · Article 104703
Organizes 29 counting approaches into reference-based, reference-less, and open-world text-guided methods, comparing performance and generalization on FSC-147 and CARPK.
2024 9th International Conference on Computer Science and Engineering (UBMK) · 2024
Antalya, Türkiye · pp. 800–805 · First author
Applies facial detection, landmark and feature extraction, and CNN–Transformer classification to examine expression responses during online shopping tasks.
Behind the research
I am a PhD student in Computer Engineering at Istanbul Technical University and a Graduate Research Assistant at SiMiT Lab, working under the supervision of Prof. Dr. Hazım Kemal Ekenel.
My research sits at the intersection of computer vision, deep learning, and trustworthy AI. I study how vision models behave beyond clean benchmarks: under domain shift, limited annotations, low-quality medical scans, privacy constraints, and imbalanced data.
Current directions include reliable brain-tumor MRI segmentation, conformal risk control, vision-language-guided facial expression generation, multimodal idiom understanding, and class-agnostic visual counting.
I am enthusiastic about exploring emerging ideas, continuously expanding my knowledge, and applying what I learn to solve challenging real-world problems.
Research & education
Istanbul Technical University · Computer vision and trustworthy medical AI
Istanbul Technical University · Supported by the ITU–Turkcell research scholarship
SiMiT Lab, ITU · Computer vision, biometrics, and medical imaging
Istanbul Technical University
University of Tabriz
Research collaboration
For research discussions, collaborations, or questions about my published work, reach me through my ITU email.
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