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Zhenjun Han

15 accepted papers

2026

HeroGS: Hierarchical Guidance for Robust 3D Gaussian Splatting under Sparse Views

CVPR 2026

3D Gaussian Splatting (3DGS) has recently emerged as a promising approach in novel view synthesis, combining photorealistic rendering with real-time efficiency. However, its success heavily relies on dense camera coverage; under sparse-view conditions, insufficient supervision leads to irregular Gau

Cited by 0SourceScholar
2025

Boosting Segment Anything Model Towards Open-Vocabulary Learning

AAAI 2025technical

The recent Segment Anything Model (SAM) has emerged as a new paradigmatic vision foundation model, showcasing potent zero-shot generalization and flexible prompting. Despite SAM finding applications and adaptations in various domains, its primary limitation lies in the inability to grasp object sema…

2025

SAM-CP: Marrying SAM with Composable Prompts for Versatile Segmentation

ICLR 2025poster

The Segment Anything model (SAM) has shown a generalized ability to group image pixels into patches, but applying it to semantic-aware segmentation still faces major challenges. This paper presents SAM-CP, a simple approach that establishes two types of composable prompts beyond SAM and composes the…

2024

P2Seg: Pointly-supervised Segmentation via Mutual Distillation

ICLR 2024poster

Point-level Supervised Instance Segmentation (PSIS) aims to enhance the applicability and scalability of instance segmentation by utilizing low-cost yet instance-informative annotations. Existing PSIS methods usually rely on positional information to distinguish objects, but predicting precise bound…

Cited by 2SourcePDFScholar
2024

Semantic-aware SAM for Point-Prompted Instance Segmentation

CVPR 2024highlight

Single-point annotation in visual tasks with the goal of minimizing labeling costs is becoming increasingly prominent in research. Recently visual foundation models such as Segment Anything (SAM) have gained widespread usage due to their robust zero-shot capabilities and exceptional annotation perfo…

2024

Weakly Supervised Video Individual Counting

CVPR 2024poster

Video Individual Counting (VIC) aims to predict the number of unique individuals in a single video. Existing methods learn representations based on trajectory labels for individuals which are annotation-expensive. To provide a more realistic reflection of the underlying practical challenge we introd…

2023

Spatial Self-Distillation for Object Detection with Inaccurate Bounding Boxes

ICCV 2023poster

Object detection via inaccurate bounding box supervision has boosted a broad interest due to the expensive high-quality annotation data or the occasional inevitability of low annotation quality (e.g. tiny objects). The previous works usually utilize multiple instance learning (MIL), which highly dep…

Cited by 18PDFcodeScholar
2022

End-to-End Weakly Supervised Object Detection with Sparse Proposal Evolution

ECCV 2022poster

"Conventional methods for weakly supervised object detection (WSOD) typically enumerate dense proposals and select the discriminative proposals as objects. However, these two-stage “enumerate-and-select” methods suffer object feature ambiguity brought by dense proposals and low detection efficiency…

2022

Object Localization Under Single Coarse Point Supervision

CVPR 2022poster

Point-based object localization (POL), which pursues high-performance object sensing under low-cost data annotation, has attracted increased attention. However, the point annotation mode inevitably introduces semantic variance for the inconsistency of annotated points. Existing POL methods heavily r…

Cited by 33PDFcodeScholar
2022

Point-to-Box Network for Accurate Object Detection via Single Point Supervision

ECCV 2022poster

"Object detection using single point supervision has received increasing attention over the years. However, the performance gap between point supervised object detection (PSOD) and bounding box supervised detection remains large. In this paper, we attribute such a large performance gap to the failur…

2021

Exploiting Sample Correlation for Crowd Counting With Multi-Expert Network

ICCV 2021poster

Crowd counting is a difficult task because of the diversity of scenes. Most of the existing crowd counting methods adopt complex structures with massive backbones to enhance the generalization ability. Unfortunately, the performance of existing methods on large-scale data sets is not satisfactory. I…

Cited by 38PDFScholar
2021

TS-CAM: Token Semantic Coupled Attention Map for Weakly Supervised Object Localization

ICCV 2021poster

Weakly supervised object localization (WSOL) is a challenging problem when given image category labels but requires to learn object localization models. Optimizing a convolutional neural network (CNN) for classification tends to activate local discriminative regions while ignoring complete object ex…

Cited by 254PDFcodeScholar
2018

Min-Entropy Latent Model for Weakly Supervised Object Detection

CVPR 2018poster

Weakly supervised object detection is a challenging task when provided with image category supervision but required to learn, at the same time, object locations and object detectors. The inconsistency between the weak supervision and learning objectives introduces randomness to object locations and…

2017

A scalable convolutional neural network for task-specified scenarios via knowledge distillation

ICASSP 2017accepted

In this paper, we explore the redundancy in convolutional neural network, which scales with the complexity of vision tasks. Considering that many front-end visual systems are interested in only a limited range of visual targets, the removing of task-specified network redundancy can promote a wide ra…

Cited by 0SourceScholar