four_fingerprint 1.0.0

Contactless slap fingerprint capture plugin — 4-4-2 sequencing, minutiae extraction, and matching via phone camera.

four_fingerprint

Contactless slap fingerprint capture for Flutter — 4-4-2 sequencing, minutiae extraction, and matching via phone camera.

Installation

dependencies:
  four_fingerprint: ^1.0.0

Run flutter pub get.

Usage

import 'package:four_fingerprint/four_fingerprint.dart';
import 'package:camera/camera.dart';

await FourFingerprint.instance.initialize();

final controller = FpCaptureController();
await controller.initialize();

// Set up camera
final back = (await availableCameras()).firstWhere(
  (c) => c.lensDirection == CameraLensDirection.back,
);
final cam = CameraController(back, ResolutionPreset.medium);
await cam.initialize();

// Start 4-4-2 capture
controller.startCapture();
cam.startImageStream((image) async {
  await controller.processFrame(image);
});

// Save enrollment
final enrollment = controller.buildEnrollment('user_001');
await FpSecureStorage().storeEnrollment(enrollment!);

Screenshots

[screenshots/left_slap.png]

[screenshots/right_slap.png]

[screenshots/thumbs.png]

API

Class	Purpose
FourFingerprint	Plugin entry point. Initializes native processing.
FpCaptureController	4-4-2 capture state machine with burst frame selection.
FpSecureStorage	Encrypted template storage via flutter_secure_storage.
FpEnrollmentRecord	Enrollment data model.
FpMatchResult	Verification result with score and match decision.

Platform support

Platform	Supported
Android	Yes
iOS	Yes
Linux	Yes (requires system OpenCV)

Compliance

For enterprise KYC or law-enforcement deployment, benchmark against NIST SP 500-399.