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We propose OpenVoxel, a training-free algorithm for grouping and captioning sparse voxels for the open-vocabulary 3D scene understanding tasks. Given the sparse voxel rasterization (SVR) model obtained from multi-view images of a 3D scene,…

Computer Vision and Pattern Recognition · Computer Science 2026-01-15 Sheng-Yu Huang , Jaesung Choe , Yu-Chiang Frank Wang , Cheng Sun

Open-vocabulary 3D segmentation enables exploration of 3D spaces using free-form text descriptions. Existing methods for open-vocabulary 3D instance segmentation primarily focus on identifying object-level instances but struggle with…

Computer Vision and Pattern Recognition · Computer Science 2025-01-23 Ayca Takmaz , Alexandros Delitzas , Robert W. Sumner , Francis Engelmann , Johanna Wald , Federico Tombari

The emergence of CLIP has opened the way for open-world image perception. The zero-shot classification capabilities of the model are impressive but are harder to use for dense tasks such as image segmentation. Several methods have proposed…

Computer Vision and Pattern Recognition · Computer Science 2023-11-29 Monika Wysoczańska , Michaël Ramamonjisoa , Tomasz Trzciński , Oriane Siméoni

The goal of this work is to establish a scalable pipeline for expanding an object detector towards novel/unseen categories, using zero manual annotations. To achieve that, we make the following four contributions: (i) in pursuit of…

Computer Vision and Pattern Recognition · Computer Science 2022-07-19 Chengjian Feng , Yujie Zhong , Zequn Jie , Xiangxiang Chu , Haibing Ren , Xiaolin Wei , Weidi Xie , Lin Ma

Open-vocabulary semantic segmentation requires models to effectively integrate visual representations with open-vocabulary semantic labels. While Contrastive Language-Image Pre-training (CLIP) models shine in recognizing visual concepts…

Computer Vision and Pattern Recognition · Computer Science 2024-08-12 Mengcheng Lan , Chaofeng Chen , Yiping Ke , Xinjiang Wang , Litong Feng , Wayne Zhang

Open-vocabulary Video Instance Segmentation (OpenVIS) can simultaneously detect, segment, and track arbitrary object categories in a video, without being constrained to categories seen during training. In this work, we propose InstFormer, a…

Computer Vision and Pattern Recognition · Computer Science 2024-08-20 Pinxue Guo , Tony Huang , Peiyang He , Xuefeng Liu , Tianjun Xiao , Zhaoyu Chen , Wenqiang Zhang

Semantic segmentation is a critical technique for effective scene understanding. Traditional RGB-T semantic segmentation models often struggle to generalize across diverse scenarios due to their reliance on pretrained models and predefined…

Computer Vision and Pattern Recognition · Computer Science 2024-10-10 Meng Yu , Luojie Yang , Xunjie He , Yi Yang , Yufeng Yue

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

Open-vocabulary semantic segmentation requires assigning pixel-level semantic labels while supporting an open and unrestricted set of categories. Training-free CLIP-based approaches preserve strong zero-shot generalization but typically…

Computer Vision and Pattern Recognition · Computer Science 2026-04-29 Mohamad Zamini , Diksha Shukla

We propose a training-free method for open-vocabulary semantic segmentation using Vision-and-Language Models (VLMs). Our approach enhances the initial per-patch predictions of VLMs through label propagation, which jointly optimizes…

Computer Vision and Pattern Recognition · Computer Science 2025-06-26 Vladan Stojnić , Yannis Kalantidis , Jiří Matas , Giorgos Tolias

Panoptic maps enable robots to reason about both geometry and semantics. However, open-vocabulary models repeatedly produce closely related labels that split panoptic entities and degrade volumetric consistency. The proposed UPPM advances…

Computer Vision and Pattern Recognition · Computer Science 2026-02-04 Mohamad Al Mdfaa , Raghad Salameh , Geesara Kulathunga , Sergey Zagoruyko , Gonzalo Ferrer

Medical image segmentation remains challenging due to limited annotations for training, ambiguous anatomical features, and domain shifts. While vision-language models such as CLIP offer strong cross-modal representations, their potential…

Computer Vision and Pattern Recognition · Computer Science 2026-02-25 Taha Koleilat , Hojat Asgariandehkordi , Omid Nejati Manzari , Berardino Barile , Yiming Xiao , Hassan Rivaz

Recent advent of vision-based foundation models has enabled efficient and high-quality object detection at ease. Despite the success of previous studies, object detection models face limitations on capturing small components from holistic…

Computer Vision and Pattern Recognition · Computer Science 2024-11-26 Jinwoo Ahn , Hyeokjoon Kwon , Hwiyeon Yoo

Open-vocabulary object detection enables models to localize and recognize objects beyond a predefined set of categories and is expected to achieve recognition capabilities comparable to human performance. In this study, we aim to evaluate…

Computer Vision and Pattern Recognition · Computer Science 2026-01-05 Po-Chih Wu

Understanding open-world semantics is critical for robotic planning and control, particularly in unstructured outdoor environments. Existing vision-language mapping approaches typically rely on object-centric segmentation priors, which…

Robotics · Computer Science 2025-09-23 Simon Schwaiger , Stefan Thalhammer , Wilfried Wöber , Gerald Steinbauer-Wagner

Panoptic segmentation presents a new challenge in exploiting the merits of both detection and segmentation, with the aim of unifying instance segmentation and semantic segmentation in a single framework. However, an efficient solution for…

Computer Vision and Pattern Recognition · Computer Science 2021-03-30 Zixiang Zhou , Yang Zhang , Hassan Foroosh

Large-scale vision-language models like CLIP have demonstrated impressive open-vocabulary capabilities for image-level tasks, excelling in recognizing what objects are present. However, they struggle with pixel-level recognition tasks like…

Computer Vision and Pattern Recognition · Computer Science 2024-10-01 Heeseong Shin , Chaehyun Kim , Sunghwan Hong , Seokju Cho , Anurag Arnab , Paul Hongsuck Seo , Seungryong Kim

Recently, the strong generalization ability of CLIP has facilitated open-vocabulary semantic segmentation, which labels pixels using arbitrary text. However, existing methods that fine-tune CLIP for segmentation on limited seen categories…

Computer Vision and Pattern Recognition · Computer Science 2025-11-21 Muyao Yuan , Yuanhong Zhang , Weizhan Zhang , Lan Ma , Yuan Gao , Jiangyong Ying , Yudeng Xin

Active recognition, which allows intelligent agents to explore observations for better recognition performance, serves as a prerequisite for various embodied AI tasks, such as grasping, navigation and room arrangements. Given the evolving…

Computer Vision and Pattern Recognition · Computer Science 2023-12-01 Lei Fan , Jianxiong Zhou , Xiaoying Xing , Ying Wu

Open-vocabulary segmentation models often struggle to generalize to unseen combinations of object categories and attributes, because fine-grained descriptions are typically encoded as holistic sentences that entangle multiple semantic…

Computer Vision and Pattern Recognition · Computer Science 2026-05-18 Chenhao Wang , Yingrui Ji , Yu Meng , Yao Zhu