Layered scenes whose planes translate at documented, fixed ratios, so relative depth is defined by measurable motion rather than inferred from pictorial cues, giving depth-from-video output an objective reference.
The depth map for the parallax plate, encoded brighter-is-nearer across three layers. These values are not an estimate — they are derived from the layer velocities the generator used, so the depth ordering is exact by construction. Relative depth is what matters here: the layers move at 0.6, 2.4 and 6.0 pixels per frame, a 1 : 4 : 10 ratio.
Three planes translating at 0.6, 2.4 and 6.0 pixels per frame — a 1 : 4 : 10 velocity ratio that defines their relative depth by motion alone. There are no pictorial depth cues to fall back on: no perspective convergence, no shading, no familiar object sizes. A monocular depth model that has learned pictorial cues rather than motion parallax will do poorly here, which is precisely what makes the fixture informative.
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