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Quality-Preserving Imperceptible Adversarial Attack on Skeleton-based Human Action Recognition

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Adversarial attacks on skeletal human action recognition have received significant attention. However, existing methods typically introduce noise-like perturbations that degrade motion quality post-attack, and thereby are inherently perceptible with recent advancements in S-HAR systems.

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arXiv Machine Learning
Sep 3

Adversarial Stress Testing of Outlier Detection in Subjective Image Quality Assessment

The paper introduces a general empirical worst‑case framework for testing outlier‑detection methods in subjective image quality assessment. It presents adversarial attack generators that optimize ratings to maximize the discrepancy between mean opinion scores (MOS) and ground truth, applying these to both discrete and continuous rating scales. The study evaluates several hard and soft outlier‑detection techniques, revealing significant differences in worst‑case performance and proposes low‑complexity methods that achieve strong empirical results.

By Dietmar Saupe