@inproceedings{
zhang2024pixelfade,
title={PixelFade: Privacy-preserving Person Re-identification with Noise-guided Progressive Replacement},
author={Delong Zhang and Yi-Xing Peng and Xiao-Ming Wu and Ancong Wu and Wei-Shi Zheng},
booktitle={ACM Multimedia 2024},
year={2024},
url={https://openreview.net/forum?id=TFueeF3aTo}
}
Online person re-identification services face privacy breaches from potential data leaks and recovery attacks, exposing cloud-stored images to malicious attackers and triggering public concern. The privacy protection of pedestrian images is crucial. Previous privacy-preserving person re-identification methods are unable to resist recovery attacks and compromise accuracy. In this paper, we propose an iterative method (PixelFade) to optimize pedestrian images into noise-like images to resist recovery attacks. We first give an in-depth study of protected images from previous privacy methods, which reveal that the \textbf{chaos} of protected images can disrupt the learning of recovery networks, leading to a decrease in the power of the recovery attacks. Accordingly, we propose Noise-guided Objective Function with the feature constraints of a specific authorization model, optimizing pedestrian images to normal-distributed noise images while preserving their original identity information as per the authorization model. To solve the above non-convex optimization problem, we propose a heuristic optimization algorithm that alternately performs the Constraint Operation and the Partial Replacement operation. This strategy not only safeguards that original pixels are replaced with noises to protect privacy, but also guides the images towards an improved optimization direction to effectively preserve discriminative features. Extensive experiments demonstrate that our PixelFade outperforms previous methods in resisting recovery attacks and Re-ID performance. The code will be released.
PixelFade: Privacy-preserving Person Re-identification with Noise-guided Progressive Replacement
Delong Zhang Yi-Xing Peng Xiao-Ming Wu Ancong Wu Wei-Shi Zheng