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arXiv 2508.02000cs.SDcs.CVeess.ASeess.IV

通过分层边界建模定位音视频深度伪造

Localizing Audio-Visual Deepfakes via Hierarchical Boundary Modeling

Xuanjun Chen, Shih-Peng Cheng, Jiawei Du, Lin Zhang, Xiaoxiao Miao, Chung-Che Wang, Haibin Wu, Hung-yi Lee, Jyh-Shing Roger Jang

AI总结:

针对局部篡改的音视频深度伪造定位难题,提出分层边界建模网络HBMNet,通过多模块协同与双向边界建模,显著提升定位性能并优于现有方法。

摘要:

在内容驱动的局部篡改场景下,音视频时间深度伪造定位仍是一项极具挑战性的任务。在此场景中,深度伪造区域通常仅跨越少数几帧,其余大部分帧与原始内容保持一致。为解决此问题,我们提出了分层边界建模网络(HBMNet),其包含三个模块:音频-视觉特征编码器,用于提取判别性的帧级表示;粗粒度候选区域生成器,用于预测候选边界区域;以及细粒度概率生成器,利用双向边界-内容概率来细化这些候选区域。从模态角度来看,我们通过专门的编码和融合增强了音视频学习,并辅以帧级监督以提升判别能力。从时间角度来看,HBMNet整合了多尺度线索和双向边界-内容关系。实验表明,编码和融合主要提升精确率,而帧级监督则提升召回率。每个模块(音视频融合、时间尺度、双向性)均贡献了互补的益处,共同提升了定位性能。HBMNet优于BA-TFD和UMMAFormer,并展现出随着更多训练数据而提升的可扩展性潜力。

英文摘要:

Audio-visual temporal deepfake localization under the content-driven partial manipulation remains a highly challenging task. In this scenario, the deepfake regions are usually only spanning a few frames, with the majority of the rest remaining identical to the original. To tackle this, we propose a Hierarchical Boundary Modeling Network (HBMNet), which includes three modules: an Audio-Visual Feature Encoder that extracts discriminative frame-level representations, a Coarse Proposal Generator that predicts candidate boundary regions, and a Fine-grained Probabilities Generator that refines these proposals using bidirectional boundary-content probabilities. From the modality perspective, we enhance audio-visual learning through dedicated encoding and fusion, reinforced by frame-level supervision to boost discriminability. From the temporal perspective, HBMNet integrates multi-scale cues and bidirectional boundary-content relationships. Experiments show that encoding and fusion primarily improve precision, while frame-level supervision boosts recall. Each module (audio-visual fusion, temporal scales, bi-directionality) contributes complementary benefits, collectively enhancing localization performance. HBMNet outperforms BA-TFD and UMMAFormer and shows improved potential scalability with more training data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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