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Zhongzheng Ren

15 accepted papers

2024

GoMAvatar: Efficient Animatable Human Modeling from Monocular Video Using Gaussians-on-Mesh

CVPR 2024poster

We introduce GoMAvatar a novel approach for real-time memory-efficient high-quality animatable human modeling. GoMAvatar takes as input a single monocular video to create a digital avatar capable of re-articulation in new poses and real-time rendering from novel viewpoints while seamlessly integrati…

Cited by 34SourcePDFScholar
2024

NeRFDeformer: NeRF Transformation from a Single View via 3D Scene Flows

CVPR 2024poster

We present a method for automatically modifying a NeRF representation based on a single observation of a non-rigid transformed version of the original scene. Our method defines the transformation as a 3D flowspecifically as a weighted linear blending of rigid transformations of 3D anchor points that…

2024

PhysGen: Rigid-Body Physics-Grounded Image-to-Video Generation

ECCV 2024poster

"We present PhysGen, a novel image-to-video generation method that converts a single image and an input condition (, force and torque applied to an object in the image) to produce a realistic, physically plausible, and temporally consistent video. Our key insight is to integrate model-based physical…

2023

Occupancy Planes for Single-View RGB-D Human Reconstruction

AAAI 2023technical

Single-view RGB-D human reconstruction with implicit functions is often formulated as per-point classification. Specifically, a set of 3D locations within the view-frustum of the camera are first projected independently onto the image and a corresponding feature is subsequently extracted for each 3…

2022

CASA: Category-agnostic Skeletal Animal Reconstruction

NeurIPS 2022accept

Recovering a skeletal shape from a monocular video is a longstanding challenge. Prevailing nonrigid animal reconstruction methods often adopt a control-point driven animation model and optimize bone transforms individually without considering skeletal topology, yielding unsatisfactory shape and arti…

Cited by 33SourcePDFScholar
2022

Total Variation Optimization Layers for Computer Vision

CVPR 2022poster

Optimization within a layer of a deep-net has emerged as a new direction for deep-net layer design. However, there are two main challenges when applying these layers to computer vision tasks: (a) which optimization problem within a layer is useful?; (b) how to ensure that computation within a layer…

Cited by 21PDFcodeScholar
2021

Semantic Tracklets: An Object-Centric Representation for Visual Multi-Agent Reinforcement Learning

IROS 2021poster

Solving complex real-world tasks, e.g., autonomous fleet control, often involves a coordinated team of multiple agents which learn strategies from visual inputs via reinforcement learning. Many existing multi-agent reinforcement learning (MARL) algorithms however don’t scale to environments where ag…

Cited by 19SourcecodeScholar
2020

Instance-Aware, Context-Focused, and Memory-Efficient Weakly Supervised Object Detection

CVPR 2020poster

Weakly supervised learning has emerged as a compelling tool for object detection by reducing the need for strong supervision during training. However, major challenges remain: (1) differentiation of object instances can be ambiguous; (2) detectors tend to focus on discriminative parts rather than en…

Cited by 261PDFcodeScholar
2020

Not All Unlabeled Data are Equal: Learning to Weight Data in Semi-supervised Learning

NeurIPS 2020poster

Existing semi-supervised learning (SSL) algorithms use a single weight to balance the loss of labeled and unlabeled examples, i.e., all unlabeled examples are equally weighted. But not all unlabeled data are equal. In this paper we study how to use a different weight for “every” unlabeled example. M…

Cited by 0SourcePDFScholar
2020

UFO²: A Unified Framework towards Omni-supervised Object Detection

ECCV 2020poster

Existing work on object detection often relies on a single form of annotation: the model is trained using either accurate yet costly bounding boxes or cheaper but less expressive image-level tags. However, real-world annotations are often diverse in form, which challenges these existing works. In th…

2018

Learning to Anonymize Faces for Privacy Preserving Action Detection

ECCV 2018poster

There is an increasing concern in computer vision devices invading the privacy of their users. We want the camera systems/robots to recognize important events and assist human daily life by understanding its videos, but we also want to ensure that they do not intrude people's privacy. In this paper,…

Cited by 271SourcePDFScholar