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Fengbei Liu

9 accepted papers

2026

BackSplit: The Importance of Sub-dividing the Background in Biomedical Lesion Segmentation

CVPR 2026

Segmenting small lesions in medical images remains notoriously difficult. Most prior work tackles this challenge by either designing better architectures, loss functions, or data augmentation schemes; and collecting more labeled data. We take a different view, arguing that part of the problem lies i

Cited by 0SourceScholar
2026

From Failure to Feedback: Group Revision Unlocks Hard Cases in Object-Level Grounding

CVPR 2026

Finetuning Large Vision-Language Models with reinforcement learning has emerged as a promising approach to enhance their capability in object-level grounding. However, existing methods, mainly based on GRPO, assign rewards at the response level. Such sparse reward leads to minimal learning signals w

Cited by 0SourcecodeScholar
2026

RNED: Rotary Number Encoding and Decoding for Medical VLMs

CVPR 2026

Vision-Language Models (VLMs) are increasingly adopted for medical applications, but their clinical utility is limited by a core weakness in quantitative reasoning. This limitation affects tasks ranging from regression of lesion sizes to prediction of bounding-box coordinates and stems from the disc

Cited by 0SourceScholar
2024

Unraveling Instance Associations: A Closer Look for Audio-Visual Segmentation

CVPR 2024poster

Audio-visual segmentation (AVS) is a challenging task that involves accurately segmenting sounding objects based on audio-visual cues. The effectiveness of audio-visual learning critically depends on achieving accurate cross-modal alignment between sound and visual objects. Successful audio-visual l…

2023

BoMD: Bag of Multi-label Descriptors for Noisy Chest X-ray Classification

ICCV 2023poster

Deep learning methods have shown outstanding classification accuracy in medical imaging problems, which is largely attributed to the availability of large-scale datasets manually annotated with clean labels. However, given the high cost of such manual annotation, new medical imaging classification p…

Cited by 10PDFcodeScholar
2023

Learning Support and Trivial Prototypes for Interpretable Image Classification

ICCV 2023poster

Prototypical part network (ProtoPNet) methods have been designed to achieve interpretable classification by associating predictions with a set of training prototypes, which we refer to as trivial prototypes because they are trained to lie far from the classification boundary in the feature space. No…

Cited by 30PDFcodeScholar
2022

ACPL: Anti-Curriculum Pseudo-Labelling for Semi-Supervised Medical Image Classification

CVPR 2022poster

Effective semi-supervised learning (SSL) in medical image analysis (MIA) must address two challenges: 1) work effectively on both multi-class (e.g., lesion classification) and multi-label (e.g., multiple-disease diagnosis) problems, and 2) handle imbalanced learning (because of the high variance in…

Cited by 124PDFcodeScholar
2022

Perturbed and Strict Mean Teachers for Semi-Supervised Semantic Segmentation

CVPR 2022poster

Consistency learning using input image, feature, or network perturbations has shown remarkable results in semi-supervised semantic segmentation, but this approach can be seriously affected by inaccurate predictions of unlabelled training images. There are two consequences of these inaccurate predict…

Cited by 293PDFcodeScholar
2022

Pixel-Wise Energy-Biased Abstention Learning for Anomaly Segmentation on Complex Urban Driving Scenes

ECCV 2022poster

"State-of-the-art (SOTA) anomaly segmentation approaches on complex urban driving scenes explore pixel-wise classification uncertainty learned from outlier exposure, or external reconstruction models. However, previous uncertainty approaches that directly associate high uncertainty to anomaly may so…