FOCUS: Frequency-Optimized Conditioning of DiffUSion Models for mitigating catastrophic forgetting during Test-Time Adaptation. - Gabriel Tjio; Jie Zhang 002; Xulei Yang; Yun Xing; Nhat Chung; Xiaofeng Cao 002; Ivor W. Tsang; Chee Keong Kwoh; Qing Guo 005 (CoRR, 2025)