FACT: ツール使用軌跡をコンパイルしたAI生成画像検出のためのフォレンジックエージェント
FACT: A Forensic Agent with Compiled Tool-Use Trajectories for AI-Generated Image Detection
AI生成画像を検出するために、画像に応じてフォレンジックツールを選択・実行するエージェントを学習する手法を提案。固定検出器ではなく、証拠が十分になるまでツールを呼び出し、進化・蒸留・洗練のパイプラインで高性能を達成した。
著者: Jiaoyang Chen, Bin Hu, Jingyu Hu, Kun Zhou, Qin Zhang, Zhengzhe Liu
分類: cs.CV, cs.AI
原文アブストラクト
AI-generated image detection is increasingly open-world: new image generators produce highly realistic images that make visual artifacts harder to identify. Existing detectors usually rely on a fixed set of forensic cues, so a detector that works well for one generator family may fail on another. We introduce FACT (Forensic Agent with Compiled Tool-use Trajectories), which learns an image-conditioned tool-use policy for forensic analysis. Instead of applying a fixed detector, FACT decides which forensic tools to call, interprets the returned evidence, and stops when sufficient evidence has been collected. FACT follows an Evolve--Distill--Refine pipeline: it evolves an execution-verified forensic skill, compiles the skill into action--observation tool-use trajectories, distills them into a compact agent, and refines the policy with cost-aware GRPO. Across two internal and four public benchmarks, FACT achieves the best performance among all compared methods, including on recent unseen generators, deepfakes, and manipulated images.