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Qihang Zhang

14 accepted papers

2026

BulletTime: Decoupled Control of Time and Camera Pose for Video Generation

CVPR 2026

Emerging video diffusion models achieve high visual fidelity but fundamentally couple scene dynamics with camera motion, limiting their ability to provide precise spatial and temporal control. We introduce a 4D-controllable video diffusion framework that explicitly decouples scene dynamics from came

Cited by 0SourceScholar
2025

3DitScene: Editing Any Scene via Language-guided Disentangled Gaussian Splatting

ICLR 2025poster

Scene image editing is crucial for entertainment, photography, and advertising design. Existing methods solely focus on either 2D individual object or 3D global scene editing. This results in a lack of a unified approach to effectively control and manipulate scenes at the 3D level with different lev…

Cited by 4SourcePDFScholar
2025

A Multi-Granularity Clustering Approach for Federated Backdoor Defense with the Adam Optimizer

IJCAI 2025

Federated learning is vulnerable to backdoor attacks due to its distributed nature and the inability to access local datasets. Meanwhile, the heterogeneity of distributed data further complicates the detection of such attacks. However, existing defense strategies often overlook the presence of non-s

Cited by 0SourcePDFScholar
2025

Denoising Autoregressive Transformers for Scalable Text-to-Image Generation

ICLR 2025poster

Diffusion models have become the dominant approach for visual generation. They are trained by denoising a Markovian process which gradually adds noise to the input. We argue that the Markovian property limits the model’s ability to fully utilize the generation trajectory, leading to inefficiencies d…

Cited by 0SourcePDFScholar
2025

Test-Time Steering for Lossless Text Compression via Weighted Product of Experts

EMNLP 2025

Lossless compression techniques are crucial in an era of rapidly growing data. Traditional universal compressors like gzip offer low computational overhead, high speed, and broad applicability across data distributions. However, they often lead to worse compression rates than modern neural compresso

Cited by 0SourcePDFScholar
2025

World-consistent Video Diffusion with Explicit 3D Modeling

CVPR 2025highlight

Recent advancements in diffusion models have set new benchmarks in image and video generation, enabling realistic visual synthesis across single- and multi-frame contexts. However, these models still struggle with efficiently and explicitly generating 3D-consistent content. To address this, we propo…

Cited by 7SourcePDFScholar
2024

BerfScene: Bev-conditioned Equivariant Radiance Fields for Infinite 3D Scene Generation

CVPR 2024poster

Generating large-scale 3D scenes cannot simply apply existing 3D object synthesis technique since 3D scenes usually hold complex spatial configurations and consist of a number of objects at varying scales. We thus propose a practical and efficient 3D representation that incorporates an equivariant r…

2024

Towards Text-guided 3D Scene Composition

CVPR 2024poster

We are witnessing significant breakthroughs in the technology for generating 3D objects from text. Existing approaches either leverage large text-to-image models to optimize a 3D representation or train 3D generators on object-centric datasets. Generating entire scenes however remains very challengi…

2023

GeoMIM: Towards Better 3D Knowledge Transfer via Masked Image Modeling for Multi-view 3D Understanding

ICCV 2023poster

Multi-view camera-based 3D detection is a challenging problem in computer vision. Recent works leverage a pretrained LiDAR detection model to transfer knowledge to a camera-based student network. However, we argue that there is a major domain gap between the LiDAR BEV features and the camera-based B…

Cited by 16PDFcodeScholar
2023

Learning Modulated Transformation in GANs

NeurIPS 2023poster

The success of style-based generators largely benefits from style modulation, which helps take care of the cross-instance variation within data. However, the instance-wise stochasticity is typically introduced via regular convolution, where kernels interact with features at some fixed locations, lim…

2022

Generative Category-Level Shape and Pose Estimation with Semantic Primitives

CoRL 2022poster

Empowering autonomous agents with 3D understanding for daily objects is a grand challenge in robotics applications. When exploring in an unknown environment, existing methods for object pose estimation are still not satisfactory due to the diversity of object shapes. In this paper, we propose a nove…

Cited by 28SourcecodeScholar
2022

Learning to Drive by Watching YouTube Videos: Action-Conditioned Contrastive Policy Pretraining

ECCV 2022poster

"Deep visuomotor policy learning, which aims to map raw visual observation to action, achieves promising results in control tasks such as robotic manipulation and autonomous driving. However, it requires a huge number of online interactions with the training environment, which limits its real-world…