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fix(visaged): warm up with the IR emitter active so the first verify is not blown out #104

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fix(visaged): warm up with the IR emitter active so the first verify is not blown out #104

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11 changes: 7 additions & 4 deletions crates/visaged/src/engine.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -164,12 +164,15 @@ pub fn spawn_engine(
None
};

// Discard warmup frames for camera AGC/AE stabilization
// Discard warmup frames for camera AGC/AE stabilization — with the emitter
// active, in one continuous stream. Auto-gain only adapts while streaming;
// warming up against ambient light leaves it high, and the first lit
// capture after start is then saturated white and fails detection.
if warmup_frames > 0 {
tracing::info!(count = warmup_frames, "discarding warmup frames");
for _ in 0..warmup_frames {
let _ = camera.capture_frame();
}
activate_emitter(&emitter);
let _ = camera.capture_frames(warmup_frames);
deactivate_emitter(&emitter);
}

let (tx, mut rx) = mpsc::channel::<EngineRequest>(4);
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1 change: 1 addition & 0 deletions docs/operations-guide.md
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Expand Up @@ -322,6 +322,7 @@ Environment=VARIABLE=value
| `VISAGE_VERIFY_TIMEOUT_SECS` | `10` | Max seconds for a verify attempt |
| `VISAGE_FRAMES_PER_VERIFY` | `3` | Frames captured per authentication |
| `VISAGE_FRAMES_PER_ENROLL` | `5` | Frames captured per enrollment |
| `VISAGE_WARMUP_FRAMES` | `4` | Usable frames discarded at daemon start, captured with the IR emitter active so auto-gain settles against it. Raise it if the first verify after start fails and later ones work. |
| `VISAGE_EMITTER_ENABLED` | `1` | Set to `0` to disable IR emitter |
| `VISAGE_LIVENESS_ENABLED` | `1` | Set to `0` to disable passive liveness detection (development only) |
| `VISAGE_LIVENESS_MIN_DISPLACEMENT` | `0.8` | Minimum eye landmark displacement (px) for liveness check |
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