Edge-Oriented Adversarial Attack for Deep Gait Recognition

Gait recognition is a non-intrusive method that captures unique walking patterns without subject cooperation, which has emerged as a promising technique across various fields. Recent studies based on Deep Neural Networks (DNNs) have notably improved the performance, however, the potential vulnerability inherent in DNNs and their resistance to interference in practical gait recognition systems remain under-explored. To fill the gap, in this paper, we focus on imperceptible adversarial attack for deep gait recognition and propose an edge-oriented attack strategy tailored for silhouette-based approaches. Specifically, we make a pioneering attempt to explore the intrinsic characteristics of binary silhouettes, with a primary focus on injecting noise perturbations into the edge area. This simple yet effective solution enables sparse attack in both the spatial and temporal dimensions, which largely ensures imperceptibility and simultaneously achieves high success rate. In particular, our solution is built on a unified framework, allowing seamless switching between untargeted and targeted attack modes. Extensive experiments conducted on in-the-lab and in-the-wild benchmarks validate the effectiveness of our attack strategy and emphasize the necessity to study adversarial attack and defense strategy in the near future.