# FoMo: Forking Moment in Generative Trajectory as a Perceptual Distance > Source: > Published: 2026-09-28 05:00:20+00:00 Reference-based image quality assessment (IQA) metrics aim to reflect how humans perceive the perceptual distance between a pair of images. To learn how the human visual system (HVS) operates, recent reference-based IQA metrics heavily rely on human-annotated data. Mean opinion score (MOS)-based poi