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Ka Chun Cheung

31 accepted papers

2026

Context-Driven Incremental Compression for Multi-Turn Dialogue Generation

ICML 2026poster

Modern conversational agents condition on an ever-growing dialogue history at each turn, incurring redundant attention and encoding costs that grow with conversation length. Naive truncation or summarization degrades fidelity, while existing context compressors lack cross-turn memory sharing or revi…

Cited by 0SourceScholar
2026

Learning Self-Critiquing Mechanisms for Region-Guided Chest X-Ray Report Generation

ICLR 2026poster

Automatic radiology reporting assists radiologists in diagnosing abnormalities in radiology images, where grounding the automatic diagnosis with abnormality locations is important for the report interpretability. However, existing supervised-learning methods could lead to learning the superficial st…

Cited by 0SourceScholar
2026

Medic-AD: Towards Medical Vision-Language Model's Clinical Intelligence

CVPR 2026

Lesion detection, symptom tracking, and visual explainability are central to real-world medical image analysis, yet current medical Vision-Language Models (VLMs) still lack mechanisms that translate their broad knowledge into clinically actionable outputs. To bridge this gap, we present Medic-AD, a

Cited by 0SourcecodeScholar
2026

QeRL: Beyond Efficiency - Quantization-enhanced Reinforcement Learning for LLMs

ICLR 2026poster

We propose QeRL, a Quantization-enhanced Reinforcement Learning framework for large language models (LLMs). While RL is essential for LLMs' reasoning capabilities, it is resource-intensive, requiring substantial GPU memory and long rollout duration. QeRL addresses these issues by combining NVFP4 qua…

Cited by 0SourcecodeScholar
2026

Texvent: Asynchronous Event Data Simulation via Text Prompt

CVPR 2026

Current event simulation methods focus on employing videos to synthesize new event data, suffering from costly video capture and limited scalability across viewpoints, motions, and lighting. To this end, we propose a Text-to-event simulation framework (Texvent) that can directly generate asynchronou

Cited by 0SourcecodeScholar
2025

GSPN-2: Efficient Parallel Sequence Modeling

NeurIPS 2025poster

Efficient vision transformer remains a bottleneck for high-resolution images and long-video related real-world applications. Generalized Spatial Propagation Network (GSPN) \cite{wang2025parallel} addresses this by replacing quadratic self-attention with a line-scan propagation scheme, bringing the c…

Cited by 0SourceScholar
2025

ImageSentinel: Protecting Visual Datasets from Unauthorized Retrieval-Augmented Image Generation

NeurIPS 2025poster

The widespread adoption of Retrieval-Augmented Image Generation (RAIG) has raised significant concerns about the unauthorized use of private image datasets. While these systems have shown remarkable capabilities in enhancing generation quality through reference images, protecting visual datasets fro…

Cited by 0SourceScholar
2025

M3Net: Multimodal Multi-task Learning for 3D Detection, Segmentation, and Occupancy Prediction in Autonomous Driving

AAAI 2025technical

The perception system for autonomous driving generally requires to handle multiple diverse sub-tasks. However, current algorithms typically tackle individual sub-tasks separately, which leads to low efficiency when aiming at obtaining full-perception results. Some multi-task learning methods try to…

2025

Meme Trojan: Backdoor Attacks Against Hateful Meme Detection via Cross-Modal Triggers

AAAI 2025technical

Hateful meme detection aims to prevent the proliferation of hateful memes on various social media platforms. Considering its impact on social environments, this paper introduces a previously ignored but significant threat to hateful meme detection: backdoor attacks. By injecting specific triggers in…

2025

One-Minute Video Generation with Test-Time Training

CVPR 2025poster

Transformers today still struggle to generate one-minute videos because self-attention layers are inefficient for long context. Alternatives such as Mamba layers struggle to produce coherent scenes because their hidden states are small and less expressive. We experiment with Test-Time Training (TTT)…

2025

Parallel Sequence Modeling via Generalized Spatial Propagation Network

CVPR 2025poster

We present the Generalized Spatial Propagation Network (GSPN), a new attention mechanism optimized for vision tasks that inherently captures 2D spatial structures. Existing attention models, including transformers, linear attention, and state-space models like Mamba, process multi-dimensional data a…

Cited by 0SourcePDFScholar
2025

Resilient Test-Time Adaptation by Mitigating Batch-Normalization Overfitting

ICASSP 2025accepted

Test-time domain adaptation adjusts a source domain model to accommodate previously unseen domain shifts in a target domain during inference. In real-world scenarios, domain shifts continually evolve, and test data are often non-independent and identically distributed (non-i.i.d.). Existing methods…

Cited by 0SourceScholar
2025

Test-Time Adaptation on Noisy Data via Model-Pruning-Based Filtering and Flatness-Aware Entropy Minimization

AAAI 2025technical

Test-time adaptation (TTA) deals with domain shifts during inference by training models based on only unlabeled test samples. Test samples may include noisy samples, which degrade domain adaptation. Existing methods rely on the model's output prediction to detect and filter noisy samples, and furthe…

2025

Token-Efficient VLM: High-Resolution Image Understanding via Dynamic Region Proposal

ICCV 2025poster

Vision-Language Models (VLMs) excel at visual understanding by leveraging pretrained image encoders to generate visual tokens. However, they struggle with high-resolution images and zoomed-in regions due to the computational burden and token redundancy of uniform patch-based processing, often leadin…

Cited by 0SourcePDFScholar
2024

AHIVE: Anatomy-aware Hierarchical Vision Encoding for Interactive Radiology Report Retrieval

CVPR 2024poster

Automatic radiology report generation using deep learning models has been recently explored and found promising. Neural decoders are commonly used for the report generation where irrelevant and unfaithful contents are unavoidable. The retrieval-based approach alleviates the limitation by identifying…

Cited by 3SourcePDFScholar
2024

GaussianMarker: Uncertainty-Aware Copyright Protection of 3D Gaussian Splatting

NeurIPS 2024poster

3D Gaussian Splatting (3DGS) has become a crucial method for acquiring 3D assets. To protect the copyright of these assets, digital watermarking techniques can be applied to embed ownership information discreetly within 3DGS mod- els. However, existing watermarking methods for meshes, point clouds,…

Cited by 4SourcePDFScholar
2024

Geometry Cloak: Preventing TGS-based 3D Reconstruction from Copyrighted Images

NeurIPS 2024poster

Single-view 3D reconstruction methods like Triplane Gaussian Splatting (TGS) have enabled high-quality 3D model generation from just a single image input within seconds. However, this capability raises concerns about potential misuse, where malicious users could exploit TGS to create unauthorized 3D…

Cited by 2SourcePDFScholar
2024

GeometrySticker: Enabling Ownership Claim of Recolorized Neural Radiance Fields

ECCV 2024poster

"Remarkable advancements in the recolorization of Neural Radiance Fields (NeRF) have simplified the process of modifying NeRF’s color attributes. Yet, with the potential of NeRF to serve as shareable digital assets, there’s a concern that malicious users might alter the color of NeRF models and fals…

2024

Protecting NeRFs' Copyright via Plug-And-Play Watermarking Base Model

ECCV 2024poster

"Neural Radiance Fields (NeRFs) have become a key method for 3D scene representation. With the rising prominence and influence of NeRF, safeguarding its intellectual property has become increasingly important. In this paper, we propose NeRFProtector, which adopts a plug-and-play strategy to protect…

2024

RegionGPT: Towards Region Understanding Vision Language Model

CVPR 2024poster

Vision language models (VLMs) have experienced rapid advancements through the integration of large language models (LLMs) with image-text pairs yet they struggle with detailed regional visual understanding due to limited spatial awareness of the vision encoder and the use of coarse-grained training…

Cited by 44SourcePDFScholar
2023

A Simple Baseline for Video Restoration With Grouped Spatial-Temporal Shift

CVPR 2023poster

Video restoration, which aims to restore clear frames from degraded videos, has numerous important applications. The key to video restoration depends on utilizing inter-frame information. However, existing deep learning methods often rely on complicated network architectures, such as optical flow es…

2023

CopyRNeRF: Protecting the CopyRight of Neural Radiance Fields

ICCV 2023poster

Neural Radiance Fields (NeRF) have the potential to be a major representation of media. Since training a NeRF has never been an easy task, the protection of its model copyright should be a priority. In this paper, by analyzing the pros and cons of possible copyright protection solutions, we propose…

Cited by 43PDFcodeScholar
2023

FlowFormer++: Masked Cost Volume Autoencoding for Pretraining Optical Flow Estimation

CVPR 2023poster

FlowFormer introduces a transformer architecture into optical flow estimation and achieves state-of-the-art performance. The core component of FlowFormer is the transformer-based cost-volume encoder. Inspired by recent success of masked autoencoding (MAE) pretraining in unleashing transformers' capa…

2023

NAS-LID: Efficient Neural Architecture Search with Local Intrinsic Dimension

AAAI 2023technical

One-shot neural architecture search (NAS) substantially improves the search efficiency by training one supernet to estimate the performance of every possible child architecture (i.e., subnet). However, the inconsistency of characteristics among subnets incurs serious interference in the optimization…

2023

TrajectoryFormer: 3D Object Tracking Transformer with Predictive Trajectory Hypotheses

ICCV 2023poster

3D multi-object tracking (MOT) is vital for many applications including autonomous driving vehicles and service robots. With the commonly used tracking-by-detection paradigm, 3D MOT has made important progress in recent years. However, these methods only use the detection boxes of the current frame…

Cited by 15PDFcodeScholar
2023

VideoFlow: Exploiting Temporal Cues for Multi-frame Optical Flow Estimation

ICCV 2023poster

We introduce VideoFlow, a novel optical flow estimation framework for videos. In contrast to previous methods that learn to estimate optical flow from two frames, VideoFlow concurrently estimates bi-directional optical flows for multiple frames that are available in videos by sufficiently exploiting…

Cited by 104PDFcodeScholar
2022

Adaptive Label Smoothing with Self-Knowledge in Natural Language Generation

EMNLP 2022main

Overconfidence has been shown to impair generalization and calibration of a neural network. Previous studies remedy this issue by adding a regularization term to a loss function, preventing a model from making a peaked distribution. Label smoothing smoothes target labels with a pre-defined prior lab…

2022

FlowFormer: A Transformer Architecture for Optical Flow

ECCV 2022poster

"We introduce optical Flow transFormer, dubbed as FlowFormer, a transformer-based neural network architecture for learning optical flow. FlowFormer tokenizes the 4D cost volume built from an image pair, encodes the cost tokens into a cost memory with alternate-group transformer (AGT) layers in a nov…

2022

Hard Gate Knowledge Distillation - Leverage Calibration for Robust and Reliable Language Model

EMNLP 2022main

In knowledge distillation, a student model is trained with supervisions from both knowledge from a teacher and observations drawn from a training data distribution. Knowledge of a teacher is considered a subject that holds inter-class relations which send a meaningful supervision to a student; hence…

Cited by 3SourcePDFScholar
2022

Learning Degradation Representations for Image Deblurring

ECCV 2022poster

"In various learning-based image restoration tasks, such as image denoising and image super-resolution, the degradation representations were widely used to model the degradation process and handle complicated degradation patterns. However, they are less explored in learning-based image deblurring as…

2022

MPPNet: Multi-Frame Feature Intertwining with Proxy Points for 3D Temporal Object Detection

ECCV 2022poster

"Accurate and reliable 3D detection is vital for many applications including autonomous driving vehicles and service robots. In this paper, we present a flexible and high-performance 3D detection frame-work, named MPPNet, for 3D temporal object detection with point cloud sequences. We propose a nove…