arXiv AI By Shashank Kotyan, Makoto Shing, Yuki Imajuku, Rujikorn Charakorn, Tarin Clanuwat

Prior-Conditioned Gaussian Discriminants for Generalizable AI-generated Image Detection

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The paper introduces prior-conditioned Gaussian discriminants as a diagnostic tool for AI-generated image detection. By fitting closed‑form classifier heads from first‑ and second‑order feature statistics, the authors evaluate performance across 39 public datasets (7.1 million images) using the Percept‑Lens protocol. Results show that these Gaussian heads can match or surpass existing detector heads when matched on prior and encoder, highlighting sensitivity to training prior, data efficiency, and representation dependence.

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arXiv AI
Sep 25

EIB-Net: Entropy-Guided Information Bottleneck for Generalizable AI-Generated Image Detection

EIB-Net is an Entropy‑Guided Information Bottleneck Network designed to detect AI‑generated images across diverse generative models. It introduces an Image Entropy metric to automatically select the most informative, low‑entropy patch and applies a Variational Information Bottleneck to learn compact, generalizable features. Experiments on DIFF, DiffusionForensics, and GenImage benchmarks show state‑of‑the‑art performance, achieving 85.7% accuracy with only 2% of training data and maintaining robust cross‑generator generalization.

By Zhida Zhang, Xinlei Ma, Jie Cao