TADP: Dual-Branch Temporally Adaptive Differential Privacy for Expression-Aware Video Anonymization

TADP is a temporally adaptive differential privacy framework designed for privacy-preserving video generation with fixed-length clip-replacement adjacency. It employs a dual-branch architecture to separately extract identity and expression representations, applying temporally adaptive Gaussian mechanisms to each branch and using adaptive Rényi Differential Privacy composition to ensure joint release privacy. The framework converts clip-level RDP guarantees to (ε,δ)-differential privacy, applies DP post-processing, and demonstrates reduced identity leakage, good perceptual quality, temporal stability, and high expression recognition utility on facial expression datasets.

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