FingerScanner

A Flutter biometric capture app demonstrating Clean Architecture and Riverpod.

Features

Camera Preview: Real-time camera feed using the camera package.
Real-time Quality Analysis:
- Throttled Stream: Processes camera frames at ~6-7 FPS.
- Background Isolate: Offloads heavy image processing to a background thread to keep UI smooth.
- Quality Checks:
  - Sharpness: Laplacian variance.
  - Brightness: Mean pixel intensity.
  - Presence: ROI standard deviation check.
Dynamic UI Guide: Visual guide changes color (Red/Green) based on analysis results.
Clean Architecture: Separation of concerns into Core, Data, Domain, and Presentation layers.
State Management: Powered by flutter_riverpod (Notifier).

Install Dependencies:
```
flutter pub get
```
Run on Device: Connect a physical device (Camera is not supported on iOS Simulator).
```
flutter run
```

iOS: NSCameraUsageDescription and NSMicrophoneUsageDescription are added to Info.plist.
Android: android.permission.CAMERA is added to AndroidManifest.xml.

Domain Layer: Entities (ScanResult, QualityStatus), Repositories (Interface), UseCases (ScanFingerprint).
Data Layer: DataSources (CameraDataSource), Repository Implementation.
Presentation Layer: Riverpod Providers (ScannerNotifier), Screens (ScannerScreen), Widgets (CameraPreviewWidget, FingerprintGuidePainter).
Core: Services (ImageProcessorIsolate using opencv_dart).# finger_print