Search Results for author: Jiachen Lei

Found 3 papers, 3 papers with code

SurrogatePrompt: Bypassing the Safety Filter of Text-To-Image Models via Substitution

1 code implementation25 Sep 2023 Zhongjie Ba, Jieming Zhong, Jiachen Lei, Peng Cheng, Qinglong Wang, Zhan Qin, Zhibo Wang, Kui Ren

Evaluation results disclose an 88% success rate in bypassing Midjourney's proprietary safety filter with our attack prompts, leading to the generation of counterfeit images depicting political figures in violent scenarios.

Masked Diffusion Models Are Fast Distribution Learners

1 code implementation20 Jun 2023 Jiachen Lei, Qinglong Wang, Peng Cheng, Zhongjie Ba, Zhan Qin, Zhibo Wang, Zhenguang Liu, Kui Ren

In the pre-training stage, we propose to mask a high proportion (e. g., up to 90\%) of input images to approximately represent the primer distribution and introduce a masked denoising score matching objective to train a model to denoise visible areas.

Denoising Image Generation

Masked Autoencoders for Egocentric Video Understanding @ Ego4D Challenge 2022

1 code implementation18 Nov 2022 Jiachen Lei, Shuang Ma, Zhongjie Ba, Sai Vemprala, Ashish Kapoor, Kui Ren

In this report, we present our approach and empirical results of applying masked autoencoders in two egocentric video understanding tasks, namely, Object State Change Classification and PNR Temporal Localization, of Ego4D Challenge 2022.

Object State Change Classification Temporal Localization +1

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