DRIFT: From Robustness Gaps to Invariance Manifolds for AI-Generated Image Detection

• URL: http://arxiv.org/abs/2606.06918v1
• Date: Fri, 05 Jun 2026 05:32:57 GMT
• Title: DRIFT: From Robustness Gaps to Invariance Manifolds for AI-Generated Image Detection
• Abstract summary: We formulate AI-generated image detection as learning a structured invariance manifold of real images under one-class supervision.<n>A robust subspace is explicitly trained to suppress variations induced by physically plausible imaging transformations.<n>Experiments demonstrate strong open-world generalization across unseen generators and resolutions.
• Score: 3.9536138432623122
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The rapid evolution of generative image models challenges existing AI-generated image detectors, particularly in open-world settings with unseen generators. Recent training-free approaches measure robustness gaps in frozen vision foundation models (VFMs), detecting fakes via perturbation-induced embedding drift. However, these methods rely on fixed invariance geometry inherited from pretraining and lack principled adaptation to the detection task. We instead formulate AI-generated image detection as learning a structured invariance manifold of real images under one-class supervision. Building upon a frozen VFM, we introduce lightweight projection heads that decompose representation space into complementary robust and fragile subspaces. The robust subspace is explicitly trained to suppress variations induced by physically plausible imaging transformations, approximating tangent directions of a real-image manifold, while the fragile subspace retains sensitivity to edit-like perturbations. A structured ordering margin enforces hierarchical separation between physical invariance and edit-induced variability, enabling detection as a margin-violation test relative to the learned manifold. At inference, multi-scale patch-wise drift under both transformation families yields a dual-channel invariance signature and interpretable localization. Extensive experiments demonstrate strong open-world generalization across unseen generators and resolutions, consistently outperforming training-free robustness-based baselines while providing interpretable invariance-violation maps.

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