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How to extract instance-level masks without instance-level supervision is the main challenge of weakly supervised instance segmentation (WSIS). Popular WSIS methods estimate a displacement field (DF) via learning inter-pixel relations and…

Computer Vision and Pattern Recognition · Computer Science 2024-11-20 Tengbo Wang , Yu Bai

Video instance segmentation aims at predicting object segmentation masks for each frame, as well as associating the instances across multiple frames. Recent end-to-end video instance segmentation methods are capable of performing object…

Computer Vision and Pattern Recognition · Computer Science 2022-06-15 Quanzeng You , Jiang Wang , Peng Chu , Andre Abrantes , Zicheng Liu

We present a bottom-up approach for the task of object instance segmentation using a single-shot model. The proposed model employs a fully convolutional network which is trained to predict class-wise segmentation masks as well as the…

Computer Vision and Pattern Recognition · Computer Science 2018-07-23 Jacob Richeimer , Jonathan Mitchell

In this paper, we aim to study how to build a strong instance segmenter with minimal training time and GPUs, as opposed to the majority of current approaches that pursue more accurate instance segmenter by building more advanced frameworks…

Computer Vision and Pattern Recognition · Computer Science 2023-08-08 Zhanhao Liang , Yuhui Yuan

In this work we introduce a new Bounding-Box Free Network (BBFNet) for panoptic segmentation. Panoptic segmentation is an ideal problem for proposal-free methods as it already requires per-pixel semantic class labels. We use this…

Computer Vision and Pattern Recognition · Computer Science 2020-07-28 Ujwal Bonde , Pablo F. Alcantarilla , Stefan Leutenegger

Recent object detectors find instances while categorizing candidate regions. As each region is evaluated independently, the number of candidate regions from a detector is usually larger than the number of objects. Since the final goal of…

Computer Vision and Pattern Recognition · Computer Science 2019-09-04 Nuri Kim , Donghoon Lee , Songhwai Oh

The current state-of-the-art methods for unsupervised video object segmentation (UVOS) require extensive training on video datasets with mask annotations, limiting their effectiveness in handling challenging scenarios. However, the Segment…

Computer Vision and Pattern Recognition · Computer Science 2025-07-09 Zhenghao Zhang , Shengfan Zhang , Zhichao Wei , Zuozhuo Dai , Siyu Zhu

Open World Object Detection(OWOD) addresses realistic scenarios where unseen object classes emerge, enabling detectors trained on known classes to detect unknown objects and incrementally incorporate the knowledge they provide. While…

Computer Vision and Pattern Recognition · Computer Science 2025-12-23 Sunoh Lee , Minsik Jeon , Jihong Min , Junwon Seo

Vehicle classification is a hot computer vision topic, with studies ranging from ground-view up to top-view imagery. In remote sensing, the usage of top-view images allows for understanding city patterns, vehicle concentration, traffic…

We present a conceptually simple framework for object instance segmentation called Contour Proposal Network (CPN), which detects possibly overlapping objects in an image while simultaneously fitting closed object contours using an…

Computer Vision and Pattern Recognition · Computer Science 2021-04-09 Eric Upschulte , Stefan Harmeling , Katrin Amunts , Timo Dickscheid

We propose a simple yet efficient anchor-free instance segmentation, called CenterMask, that adds a novel spatial attention-guided mask (SAG-Mask) branch to anchor-free one stage object detector (FCOS) in the same vein with Mask R-CNN.…

Computer Vision and Pattern Recognition · Computer Science 2020-04-03 Youngwan Lee , Jongyoul Park

Weakly supervised instance segmentation reduces the cost of annotations required to train models. However, existing approaches which rely only on image-level class labels predominantly suffer from errors due to (a) partial segmentation of…

Computer Vision and Pattern Recognition · Computer Science 2021-03-25 Qing Liu , Vignesh Ramanathan , Dhruv Mahajan , Alan Yuille , Zhenheng Yang

Collecting labeled data for machine learning models is often expensive and time-consuming. Active learning addresses this challenge by selectively labeling the most informative observations, but when initial labeled data is limited, it…

Machine Learning · Statistics 2025-03-13 Simon Nguyen , Kentaro Hoffman , Tyler McCormick

Instance segmentation is essential for applications such as automated monitoring of plant health, growth, and yield. However, extensive effort is required to create large-scale datasets with pixel-level annotations of each object instance…

Computer Vision and Pattern Recognition · Computer Science 2026-03-10 Keyhan Najafian , Farhad Maleki , Lingling Jin , Ian Stavness

Unseen Object Instance Segmentation (UOIS) is crucial for autonomous robots operating in unstructured environments. Previous approaches require full supervision on large-scale tabletop datasets for effective pretraining. In this paper, we…

Robotics · Computer Science 2024-09-25 Rui Cao , Chuanxin Song , Biqi Yang , Jiangliu Wang , Pheng-Ann Heng , Yun-Hui Liu

Instance segmentation is a promising yet challenging topic in computer vision. Recent approaches such as Mask R-CNN typically divide this problem into two parts -- a detection component and a mask generation branch, and mostly focus on the…

Computer Vision and Pattern Recognition · Computer Science 2019-09-30 Shichao Xu , Shuyue Lan , Qi Zhu

Semi-supervised crowd analysis is a prominent area of research, as unlabeled data are typically abundant and inexpensive to obtain. However, traditional point-based annotations constrain performance because individual regions are inherently…

Computer Vision and Pattern Recognition · Computer Science 2026-03-18 Jiyang Huang , Hongru Cheng , Wei Lin , Jia Wan , Antoni B. Chan

Novel Instance Detection and Segmentation (NIDS) aims at detecting and segmenting novel object instances given a few examples of each instance. We propose a unified, simple, yet effective framework (NIDS-Net) comprising object proposal…

Computer Vision and Pattern Recognition · Computer Science 2025-03-06 Yangxiao Lu , Jishnu Jaykumar P , Yunhui Guo , Nicholas Ruozzi , Yu Xiang

Sliding-window object detectors that generate bounding-box object predictions over a dense, regular grid have advanced rapidly and proven popular. In contrast, modern instance segmentation approaches are dominated by methods that first…

Computer Vision and Pattern Recognition · Computer Science 2019-08-29 Xinlei Chen , Ross Girshick , Kaiming He , Piotr Dollár

Even in controlled settings, understanding instance-wise geometries is a challenging task for a wide range of visual models. Although specialized systems exist, modern arts rely on expensive input formats (category labels, binary…

Computer Vision and Pattern Recognition · Computer Science 2025-10-28 Pierre Musacchio , Hyunmin Lee , Jaesik Park