BusterX++: Towards Unified Cross-Modal AI-Generated Content Detection and Explanation with MLLM

• URL: http://arxiv.org/abs/2507.14632v2
• Date: Thu, 31 Jul 2025 12:03:49 GMT
• Title: BusterX++: Towards Unified Cross-Modal AI-Generated Content Detection and Explanation with MLLM
• Authors: Haiquan Wen, Tianxiao Li, Zhenglin Huang, Yiwei He, Guangliang Cheng,
• Abstract summary: We introduce textbfBusterX++, a novel framework for cross-modal detection and explanation of synthetic media.<n>Our approach incorporates an advanced reinforcement learning (RL) post-training strategy that eliminates cold-start.<n>We also present textbfGenBuster++, a cross-modal benchmark leveraging state-of-the-art image and video generation techniques.
• Score: 12.349038994581415
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Recent advances in generative AI have dramatically improved image and video synthesis capabilities, significantly increasing the risk of misinformation through sophisticated fake content. In response, detection methods have evolved from traditional approaches to multimodal large language models (MLLMs), offering enhanced transparency and interpretability in identifying synthetic media. However, current detection systems remain fundamentally limited by their single-modality design. These approaches analyze images or videos separately, making them ineffective against synthetic content that combines multiple media formats. To address these challenges, we introduce \textbf{BusterX++}, a novel framework designed specifically for cross-modal detection and explanation of synthetic media. Our approach incorporates an advanced reinforcement learning (RL) post-training strategy that eliminates cold-start. Through Multi-stage Training, Thinking Reward, and Hybrid Reasoning, BusterX++ achieves stable and substantial performance improvements. To enable comprehensive evaluation, we also present \textbf{GenBuster++}, a cross-modal benchmark leveraging state-of-the-art image and video generation techniques. This benchmark comprises 4,000 images and video clips, meticulously curated by human experts using a novel filtering methodology to ensure high quality, diversity, and real-world applicability. Extensive experiments demonstrate the effectiveness and generalizability of our approach.

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