| --- |
| license: cc-by-sa-4.0 |
| pretty_name: ZDPShift |
| tags: |
| - stereo-matching |
| - disparity |
| - negative-disparity |
| - ZDP |
| - blender |
| - open-movies |
| task_categories: |
| - depth-estimation |
| size_categories: |
| - 10K<n<100K |
| --- |
| |
| # ZDPShift: Beyond the Zero-Disparity Plane in Stereo |
|
|
| <p align="center"> |
| <img src="images/teaser.png" alt="Same scene rendered at five ZDP shifts; anaglyph + GT disparity + error map" width="100%"/> |
| </p> |
|
|
| Every public stereo benchmark assumes positive disparity values`d = fB/Z ≥ 0`. Mordern stereoscopic display — cinema 3D, VR, HMDs — actively uses `d < 0`. ZDPShift bridges the gap: the same artist-authored open-movie content rendered at **five ZDP shifts** Δ ∈ {−16, 0, +16, +24, +32} pixels, giving you a controlled continuum from textbook-positive to substantially-crossed disparities, with analytical ground truth at every pixel. |
|
|
| ## News: |
| - [1st July] A technical report is on the way! |
|
|
| ## The problem in one plot |
|
|
| <p align="center"> |
| <img src="images/sota_failure.png" alt="EPE of public SOTA stereo models vs ZDP shift" width="80%"/> |
| </p> |
|
|
| Every public SOTA fails by **19–60×** the instant disparity crosses zero. ZDPShift gives you the data to fix that. |
|
|
| ## What you get |
|
|
| | Split | Source | Scenes | Frames | Pairs | Size | |
| |---|---|---:|---:|---:|---:| |
| | `train/` | 6 Blender open movies | 30 | 4,134 | 20,670 | 318 GB | |
| | `test/` | Caminandes Llamigos | 4 | 271 | 1,355 | 35 GB | |
|
|
| Per pair: **left.png** + **right.png** (1920×1280 open-movie) + **disparity.npy** (signed float32) + **meta.json** (Δ, focal, baseline, K_L, K_R, % crossed). |
|
|
| ## Gallery |
|
|
| <p align="center"> |
| <img src="images/gallery.png" alt="ZDPShift scene gallery across the 8 source franchises" width="100%"/> |
| </p> |
|
|
| ## Geometry |
|
|
| ``` |
| d(Z, Δ) = f · B / Z − Δ baseline B = 0.10 m, Δ ∈ {−16, 0, +16, +24, +32} px |
| ``` |
|
|
| Cameras stay physically parallel — only the principal points shift by ∓Δ/2. Multi-Δ self-consistency `d(Δᵢ) − d(Δⱼ) = Δⱼ − Δᵢ` holds to a median 0.04 px residual (sub-pixel Cycles noise). |
|
|
| ``` |
| rendered_datasets/<split>/<scene>/frame_<N>_<cam>/shift_{-16,+0,+16,+24,+32}/ |
| ├── left.png |
| ├── right.png |
| ├── disparity.npy |
| └── meta.json |
| ``` |
|
|
| ## Render protocol |
|
|
| To keep ground truth well-defined at every pixel, three artist settings are overridden: |
|
|
| - **Aperture forced to f/64** — defocus blur kept below sub-pixel |
| - **Motion blur off** — fast objects have crisp per-frame correspondences |
| - **Compositor bypassed** — no grading / bloom / flare distortion after correspondence |
|
|
| Everything else (lighting, materials, scene composition, camera path, focal length per shot) is inherited from the original `.blend` unchanged. Cycles 32 spp + OPTIX denoising; sampler noise floor ≈ 0.005/255 per pixel. |
|
|
| ## License |
|
|
| **CC-BY-SA-4.0**, inherited from the Blender Studio open movies. Redistribute and adapt with attribution and share-alike. |
