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Open-Vocabulary Semantic Segmentation (OVSS) has advanced with recent vision-language models (VLMs), enabling segmentation beyond predefined categories through various learning schemes. Notably, training-free methods offer scalable, easily…

Computer Vision and Pattern Recognition · Computer Science 2025-04-08 Chanyoung Kim , Dayun Ju , Woojung Han , Ming-Hsuan Yang , Seong Jae Hwang

Event cameras, known for low-latency operation and superior performance in challenging lighting conditions, are suitable for sensitive computer vision tasks such as semantic segmentation in autonomous driving. However, challenges arise due…

Computer Vision and Pattern Recognition · Computer Science 2024-08-20 Muhammad Rameez Ur Rahman , Jhony H. Giraldo , Indro Spinelli , Stéphane Lathuilière , Fabio Galasso

We describe an approach to predict open-vocabulary 3D semantic voxel occupancy map from input 2D images with the objective of enabling 3D grounding, segmentation and retrieval of free-form language queries. This is a challenging problem…

Computer Vision and Pattern Recognition · Computer Science 2024-01-18 Antonin Vobecky , Oriane Siméoni , David Hurych , Spyros Gidaris , Andrei Bursuc , Patrick Pérez , Josef Sivic

This paper presents a new method for the zero-shot open-vocabulary semantic segmentation (OVSS) of 3D automotive lidar data. To circumvent the recognized image-text modality gap that is intrinsic to approaches based on Vision Language…

Computer Vision and Pattern Recognition · Computer Science 2026-04-03 Nermin Samet , Gilles Puy , Renaud Marlet

Open-vocabulary scene understanding using 3D Gaussian (3DGS) representations has garnered considerable attention. However, existing methods mostly lift knowledge from large 2D vision models into 3DGS on a scene-by-scene basis, restricting…

Computer Vision and Pattern Recognition · Computer Science 2025-01-03 Runnan Chen , Xiangyu Sun , Zhaoqing Wang , Youquan Liu , Jiepeng Wang , Lingdong Kong , Jiankang Deng , Mingming Gong , Liang Pan , Wenping Wang , Tongliang Liu

Domain Generalization in Semantic Segmentation (DG-SS) aims to enable segmentation models to perform robustly in unseen environments. However, conventional DG-SS methods are restricted to a fixed set of known categories, limiting their…

Computer Vision and Pattern Recognition · Computer Science 2026-03-10 Dong Zhao , Qi Zang , Nan Pu , Wenjing Li , Nicu Sebe , Zhun Zhong

Vision-language models such as CLIP have recently propelled open-vocabulary dense prediction tasks by enabling recognition of a broad range of visual concepts. However, CLIP still struggles with fine-grained, region-level understanding,…

Computer Vision and Pattern Recognition · Computer Science 2025-10-02 Juan Yeo , Soonwoo Cha , Jiwoo Song , Hyunbin Jin , Taesup Kim

Open world image segmentation aims to achieve precise segmentation and semantic understanding of targets within images by addressing the infinitely open set of object categories encountered in the real world. However, traditional closed-set…

Computer Vision and Pattern Recognition · Computer Science 2026-05-19 Danyang Li , Tianhao Wu , Bin Li , Zhenyuan Chen , Yang Zhang , Yuxuan Li , Ming-Ming Cheng , Xiang Li

Open-Vocabulary Segmentation (OVS) aims to segment classes that are not present in the training dataset. However, most existing studies assume that the training data is fixed in advance, overlooking more practical scenarios where new…

Computer Vision and Pattern Recognition · Computer Science 2025-10-14 Dongjun Hwang , Yejin Kim , Minyoung Lee , Seong Joon Oh , Junsuk Choe

Open-vocabulary semantic segmentation (OVSS) involves assigning labels to each pixel in an image based on textual descriptions, leveraging world models like CLIP. However, they encounter significant challenges in cross-domain…

Computer Vision and Pattern Recognition · Computer Science 2025-06-05 Aniruddh Sikdar , Aditya Gandhamal , Suresh Sundaram

Open-Vocabulary Camouflaged Object Segmentation (OVCOS) seeks to segment and classify camouflaged objects from arbitrary categories, presenting unique challenges due to visual ambiguity and unseen categories.Recent approaches typically…

Computer Vision and Pattern Recognition · Computer Science 2026-03-10 Kai Zhao , Wubang Yuan , Zheng Wang , Guanyi Li , Xiaoqiang Zhu , Deng-ping Fan , Dan Zeng

Training-free open-vocabulary semantic segmentation(TF-OVSS) has recently attracted attention for its ability to perform dense prediction by leveraging the pretrained knowledge of large vision and vision-language models, without requiring…

Computer Vision and Pattern Recognition · Computer Science 2026-04-13 Seungjae Moon , Seunghyun Oh , Youngmin Ro

Open-vocabulary semantic segmentation (OVSS) in remote sensing images is a promising task that employs textual descriptions for identifying undefined land cover categories. Despite notable advances, existing methods typically employ a…

Computer Vision and Pattern Recognition · Computer Science 2026-04-30 Guanchun Wang , Chenxiao Wu , Xiangrong Zhang , Zelin Peng , Jianxun Lai , Tianyang Zhang , Xu Tang

Training-free open-vocabulary semantic segmentation (OVS) aims to segment images given a set of arbitrary textual categories without costly model fine-tuning. Existing solutions often explore attention mechanisms of pre-trained models, such…

Computer Vision and Pattern Recognition · Computer Science 2025-06-30 Xiwei Xuan , Ziquan Deng , Kwan-Liu Ma

Open-Vocabulary Segmentation (OVS) aims at segmenting images from free-form textual concepts without predefined training classes. While existing vision-language models such as CLIP can generate segmentation masks by leveraging coarse…

Computer Vision and Pattern Recognition · Computer Science 2025-09-17 Luca Barsellotti , Lorenzo Bianchi , Nicola Messina , Fabio Carrara , Marcella Cornia , Lorenzo Baraldi , Fabrizio Falchi , Rita Cucchiara

Open-Vocabulary Part Segmentation (OVPS) is an emerging field for recognizing fine-grained parts in unseen categories. We identify two primary challenges in OVPS: (1) the difficulty in aligning part-level image-text correspondence, and (2)…

Computer Vision and Pattern Recognition · Computer Science 2025-08-11 Jiho Choi , Seonho Lee , Minhyun Lee , Seungho Lee , Hyunjung Shim

From image-text pairs, large-scale vision-language models (VLMs) learn to implicitly associate image regions with words, which prove effective for tasks like visual question answering. However, leveraging the learned association for…

Computer Vision and Pattern Recognition · Computer Science 2024-06-18 Jiayun Luo , Siddhesh Khandelwal , Leonid Sigal , Boyang Li

We introduce the task of open-vocabulary 3D instance segmentation. Current approaches for 3D instance segmentation can typically only recognize object categories from a pre-defined closed set of classes that are annotated in the training…

Computer Vision and Pattern Recognition · Computer Science 2023-10-31 Ayça Takmaz , Elisabetta Fedele , Robert W. Sumner , Marc Pollefeys , Federico Tombari , Francis Engelmann

Most existing underwater instance segmentation approaches are constrained by close-vocabulary prediction, limiting their ability to recognize novel marine categories. To support evaluation, we introduce \textbf{MARIS} (\underline{Mar}ine…

Computer Vision and Pattern Recognition · Computer Science 2026-03-18 Bingyu Li , Feiyu Wang , Da Zhang , Zhiyuan Zhao , Junyu Gao , Xuelong Li

Benefiting from the inductive biases learned from large-scale datasets, open-vocabulary semantic segmentation (OVSS) leverages the power of vision-language models, such as CLIP, to achieve remarkable progress without requiring task-specific…

Computer Vision and Pattern Recognition · Computer Science 2025-12-09 Qiming Huang , Hao Ai , Jianbo Jiao