Given three of the four cameras, how well can each method predict depth at the fourth, and how much of that view can it predict at all?
- Treatment
- Calibrated multi-view capture from three cameras, with the fourth held out as the evaluator.
- Control
- External depth models given the same three views (MapAnything with true intrinsics, UniDepthV2, MoGe-2, VGGT, Depth Anything 3), and a single camera.
- Sample
- 5 takes × 8 frames × 4 held-out cameras: 160 cells per arm, 0 refused. An identity control reads exactly 0.
On the identical pixels every arm covers, the error is 14× lower than UniDepthV2 and MoGe-2.
CaveatRead both columns: the gain is mostly coverage. One camera to three raises coverage 29.3% to 61.4% (2.10×) but accuracy only 1.12×. Our refined output is indistinguishable from raw multi-view fusion here, so this credits calibrated multi-view capture, not the refinement layer.
Method and full caveats
- A single calibrated camera scores 6.56 at 29.3% coverage; a constant (no information) scores 135.56.
- Coverage is not the highest: UniDepthV2 and MoGe-2 cover about 64.7%, at roughly 10× the error.
- Refined output vs raw fusion is a replicated null across five takes (p = 0.625 on this data), so no win is credited to refinement.
- One room, one rig, four cameras of one model; no cross-room claim.
Ledger led-2026-09-11-0314, 0327