Search Results for author: Qihao Liu

Found 13 papers, 5 papers with code

Continual Adversarial Defense

no code implementations15 Dec 2023 Qian Wang, Yaoyao Liu, Hefei Ling, Yingwei Li, Qihao Liu, Ping Li, Jiazhong Chen, Alan Yuille, Ning Yu

In response to the rapidly evolving nature of adversarial attacks against visual classifiers on a monthly basis, numerous defenses have been proposed to generalize against as many known attacks as possible.

Adversarial Defense Continual Learning +2

Generating Images with 3D Annotations Using Diffusion Models

no code implementations13 Jun 2023 Wufei Ma, Qihao Liu, Jiahao Wang, Angtian Wang, Xiaoding Yuan, Yi Zhang, Zihao Xiao, Guofeng Zhang, Beijia Lu, Ruxiao Duan, Yongrui Qi, Adam Kortylewski, Yaoyao Liu, Alan Yuille

With explicit 3D geometry control, we can easily change the 3D structures of the objects in the generated images and obtain ground-truth 3D annotations automatically.

3D Pose Estimation Style Transfer

Discovering Failure Modes of Text-guided Diffusion Models via Adversarial Search

no code implementations1 Jun 2023 Qihao Liu, Adam Kortylewski, Yutong Bai, Song Bai, Alan Yuille

(2) We find regions in the latent space that lead to distorted images independent of the text prompt, suggesting that parts of the latent space are not well-structured.

Adversarial Attack Efficient Exploration +1

InstMove: Instance Motion for Object-centric Video Segmentation

1 code implementation CVPR 2023 Qihao Liu, Junfeng Wu, Yi Jiang, Xiang Bai, Alan Yuille, Song Bai

A common solution is to use optical flow to provide motion information, but essentially it only considers pixel-level motion, which still relies on appearance similarity and hence is often inaccurate under occlusion and fast movement.

Object Optical Flow Estimation +3

PoseExaminer: Automated Testing of Out-of-Distribution Robustness in Human Pose and Shape Estimation

1 code implementation CVPR 2023 Qihao Liu, Adam Kortylewski, Alan Yuille

We introduce a learning-based testing method, termed PoseExaminer, that automatically diagnoses HPS algorithms by searching over the parameter space of human pose images to find the failure modes.

Multi-agent Reinforcement Learning

The Runner-up Solution for YouTube-VIS Long Video Challenge 2022

no code implementations18 Nov 2022 Junfeng Wu, Yi Jiang, Qihao Liu, Xiang Bai, Song Bai

This technical report describes our 2nd-place solution for the ECCV 2022 YouTube-VIS Long Video Challenge.

Contrastive Learning Instance Segmentation +2

Explicit Occlusion Reasoning for Multi-person 3D Human Pose Estimation

no code implementations29 Jul 2022 Qihao Liu, Yi Zhang, Song Bai, Alan Yuille

Inspired by the remarkable ability of humans to infer occluded joints from visible cues, we develop a method to explicitly model this process that significantly improves bottom-up multi-person human pose estimation with or without occlusions.

3D Human Pose Estimation 3D Multi-Person Pose Estimation (absolute) +2

In Defense of Online Models for Video Instance Segmentation

1 code implementation21 Jul 2022 Junfeng Wu, Qihao Liu, Yi Jiang, Song Bai, Alan Yuille, Xiang Bai

In recent years, video instance segmentation (VIS) has been largely advanced by offline models, while online models gradually attracted less attention possibly due to their inferior performance.

Ranked #9 on Video Instance Segmentation on YouTube-VIS validation (using extra training data)

Contrastive Learning Instance Segmentation +5

Nothing But Geometric Constraints: A Model-Free Method for Articulated Object Pose Estimation

no code implementations30 Nov 2020 Qihao Liu, Weichao Qiu, Weiyao Wang, Gregory D. Hager, Alan L. Yuille

We propose an unsupervised vision-based system to estimate the joint configurations of the robot arm from a sequence of RGB or RGB-D images without knowing the model a priori, and then adapt it to the task of category-independent articulated object pose estimation.

Optical Flow Estimation Pose Estimation

PNS: Population-Guided Novelty Search for Reinforcement Learning in Hard Exploration Environments

no code implementations26 Nov 2018 Qihao Liu, Yujia Wang, Xiaofeng Liu

To balance exploration and exploitation, the Novelty Search (NS) is employed in every chief agent to encourage policies with high novelty while maximizing per-episode performance.

Continuous Control reinforcement-learning +1

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