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Effrosyni Mavroudi

9 accepted papers

2026

SAM 3: Segment Anything with Concepts

ICLR 2026poster

We present Segment Anything Model (SAM) 3, a unified model that detects, segments, and tracks objects in images and videos based on concept prompts, which we define as either short noun phrases (e.g., “yellow school bus”), image exemplars, or a combination of both. Promptable Concept Segmentation (P…

Cited by 687SourcecodeScholar
2025

Enrich and Detect: Video Temporal Grounding with Multimodal LLMs

ICCV 2025poster

We introduce ED-VTG, a method for fine-grained video temporal grounding utilizing multi-modal large language models. Our approach harnesses the capabilities of multimodal LLMs to jointly process text and video, in order to effectively localize natural language queries in videos through a two-stage p…

Cited by 0SourcePDFScholar
2025

PerceptionLM: Open-Access Data and Models for Detailed Visual Understanding

NeurIPS 2025spotlight

Vision-language models are integral to computer vision research, yet many high-performing models remain closed-source, obscuring their data, design and training recipe. The research community has responded by using distillation from black-box models to label training data, achieving strong benchmark…

Cited by 0SourcecodeScholar
2024

Ego-Exo4D: Understanding Skilled Human Activity from First- and Third-Person Perspectives

CVPR 2024poster

We present Ego-Exo4D a diverse large-scale multimodal multiview video dataset and benchmark challenge. Ego-Exo4D centers around simultaneously-captured egocentric and exocentric video of skilled human activities (e.g. sports music dance bike repair). 740 participants from 13 cities worldwide perform…

2024

Learning to Segment Referred Objects from Narrated Egocentric Videos

CVPR 2024poster

Egocentric videos provide a first-person perspective of the wearer's activities involving simultaneous interactions with multiple objects. In this work we propose the task of weakly-supervised Narration-based Video Object Segmentation (NVOS). Given an egocentric video clip and a narration of the wea…

Cited by 6SourcePDFScholar
2023

HT-Step: Aligning Instructional Articles with How-To Videos

NeurIPS 2023poster

We introduce HT-Step, a large-scale dataset containing temporal annotations of instructional article steps in cooking videos. It includes 122k segment-level annotations over 20k narrated videos (approximately 2.3k hours) of the HowTo100M dataset. Each annotation provides a temporal interval, and a c…

Cited by 18SourcePDFScholar
2023

Learning to Ground Instructional Articles in Videos through Narrations

ICCV 2023poster

In this paper we present an approach for localizing steps of procedural activities in narrated how-to videos. To deal with the scarcity of labeled data at scale, we source the step descriptions from a language knowledge base (wikiHow) containing instructional articles for a large variety of procedur…

Cited by 20PDFScholar
2022

Weakly-Supervised Generation and Grounding of Visual Descriptions With Conditional Generative Models

CVPR 2022poster

Given weak supervision from image- or video-caption pairs, we address the problem of grounding (localizing) each object word of a ground-truth or generated sentence describing a visual input. Recent weakly-supervised approaches leverage region proposals and ground words based on the region attention…

Cited by 10PDFScholar
2020

Representation Learning on Visual-Symbolic Graphs for Video Understanding

ECCV 2020poster

Events in natural videos typically arise from spatio-temporal interactions between actors and objects and involve multiple co-occurring activities and object classes. To capture this rich visual and semantic context, we propose using two graphs:(1) an attributed spatio-temporal visual graph whose no…

Cited by 44SourcePDFScholar