ParaScale: Scale-Calibrated Camera-Motion Transfer via a Gauge-Invariant Parallax Number

Transferring the camera motion of a reference video to a freshly generated one lets creators reuse cinematic moves. Yet reference and target often live at incompatible scales -- a sweep across a galaxy versus a nudge across a desk -- and naively reusing the recovered trajectory yields either imperceptible or violently exaggerated motion. We trace this to a geometric fact: translation-induced image motion scales as ||T||/Z, so a monocular trajectory is meaningful only up to a depth-scale gauge. W

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ethics.ai (18 June 2026), “ParaScale: Scale-Calibrated Camera-Motion Transfer via a Gauge-Invariant Parallax Number,” evidence record 823, https://ethics.ai/record/823 (originally published by arXiv).

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