PixelFade: Privacy-preserving Person Re-identification with Noise-guided Progressive Replacement

TL;DR

PixelFade is an innovative method that transforms pedestrian images into noise-like representations to enhance privacy protection in person re-identification while maintaining high accuracy against recovery attacks.

Contribution

The paper introduces PixelFade, a novel iterative noise-guided optimization technique that effectively resists recovery attacks and preserves identity features in privacy-sensitive re-identification tasks.

Findings

PixelFade outperforms previous methods in resisting recovery attacks.

It maintains high re-identification accuracy with privacy protection.

The approach effectively balances privacy and discriminative feature preservation.

Abstract

Online person re-identification services face privacy breaches from potential data leakage 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 chaos of protected images can disrupt the learning of recovery models. Accordingly, Specifically, 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 is available at https://github.com/iSEE-Laboratory/PixelFade.