arXiv Computer Vision By Sunwhi Kim (Hwasung Medi-Science University, Dept. of Bio-Healthcare), Sunyul Kim (Yonsei University, Graduate School of Engineering, Dept. of Artificial Intelligence), Meounggun Jo (Hoseo University), Jini Tae (Gwangju Institute of Science and Technology, School of Humanities and Social Sciences)

Frontier vision-language models have overtaken young adults at detecting AI-generated portraits -- but not their calibration

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arXiv Computation and Language
Aug 27

GGSS: Geodesic-Gated Spherical Steering for Inference-Time Debiasing of Generative Vision-Language Models

The paper introduces GGSS (Geodesic‑Gated Spherical Steering), a norm‑preserving method for inference‑time debiasing of generative vision‑language models. GGSS identifies a counterfactual bias subspace on the unit hypersphere, steers visual tokens along geodesic arcs, and applies an adaptive gate to target tokens with strong demographic signals. Experiments on four generative VLMs show that GGSS achieves the lowest average bias across multiple tests while maintaining visual‑language performance within ±0.6 pp of the baseline.

By Yiqun Sun, Junyu Chen, Pengfei Wei, Lawrence B. Hsieh