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TASK 51 slice 3: per-scene webcam BackgroundEffect + BackgroundStrength on WebcamSceneConfig, persisted via additive guarded columns; radio-pill bools RemoveBackground/BlurBackground (Unit: bg-effect config)

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gramps
2026-10-09 10:19:48 -07:00
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TASKS/task-51-webcam-bg-effects.md
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## 2. ☐ Config surface + persistence
- ☐ `WebcamSceneConfig` gains `BackgroundEffect` (`None | Remove | Blur`) + `Strength`.
- ☐ Persist via the existing `WebcamSceneConfig` table path in `LayoutStore.Save.cs`/
- ✅ `WebcamSceneConfig` gains `BackgroundEffect` (`None | Remove | Blur`) + `BackgroundStrength` (slice 3).
- ✅ Persist via the existing `WebcamSceneConfig` table path in `LayoutStore.Save.cs`/
`Load.cs` (new columns + migration). Follow `LayoutStore.Migrations.cs` conventions.
- ☐ **Properties UI (creator spec 2026-10-09):** in the webcam's properties in the **Layers
panel**, two **pill switches** — "Remove background" and "Blur background" — using the existing
@@ -92,7 +92,7 @@ delivery shape changed:
- ✅ **Bundled-model contract:** the embedded ONNX model through the C# preprocessing reproduces
MediaPipe's reference mask on a fixture (≥99.5% agreement). This is a fixed, deterministic
contract check of the shipped bytes — not a camera/lighting quality test.
- ☐ Config → persistence roundtrip (per webcam element).
- ✅ Config → persistence roundtrip per scene + legacy-DB migration (`LayoutStorePersistenceTests`).
- ☐ Engine failure → passthrough + single log, layer never dropped (code path exists; dedicated
test lands with the hookup slice).
- ☐ Real inference: **manual on the creator's box** (camera + lighting), not in CI.
@@ -103,7 +103,7 @@ delivery shape changed:
## 4. Sequencing
- ✅ Separate work unit after the zoom build (zoom shipped 2026-10-08).
- Slice order: 1 engine ✅ → 2 Blur ✅ → 3 config + persistence → 4 camera-path hookup (one
- Slice order: 1 engine ✅ → 2 Blur ✅ → 3 config + persistence ✅ → 4 camera-path hookup (one
processing point, both consumers) + perf check → 5 properties-panel UI.
## Related (not duplicated here)