FaceID Verify

A Flutter package for face scanning and face verification using the device camera.

It captures face data and compares it with previously stored face data.

---

Installation

Add the package to your pubspec.yaml.

dependencies:
  faceidverify: ^last_version

Then run:

flutter pub get

---

Permissions

Android

Add camera permission to:

android/app/src/main/AndroidManifest.xml

<uses-permission android:name="android.permission.CAMERA"/>

---

iOS

Add camera usage description to:

ios/Runner/Info.plist

<key>NSCameraUsageDescription</key>
<string>Camera permission is required for face verification</string>

---

Usage

1. Register Face

Use FaceScanner to capture face data from the user.

FaceScanner(
  onScanCompleted: (faces) {

    if (faces == null) return;

    // faces -> List<String>
    // Save this to your database or API
    print(faces);

  },
)

Returned data:

List<String>

These values represent the user's face data and should be stored.

---

2. Verify Face

Use stored face data to verify the user.

FaceVerify(
  faceDatas: storedFaces,
  onVerifyCompleted: (result) {

    if (result) {
      print("Verification successful");
    } else {
      print("Verification failed");
    }

  },
)

---

Full Example

class FaceExamplePage extends StatefulWidget 
{
  const FaceExamplePage({super.key});

  @override
  State<FaceExamplePage> createState() => _FaceExamplePageState();
}

class _FaceExamplePageState extends State<FaceExamplePage> 
{

  List<String>? faces;

  @override
  Widget build(BuildContext context) 
  {
    return Scaffold(
      appBar: AppBar(title: const Text("FaceID Example")),
      body: faces == null
          ? FaceScanner(
              onScanCompleted: (data) 
              {
                setState(() 
                {
                  faces = data;
                });
              },
            )
          : FaceVerify(
              faceDatas: faces!,
              onVerifyCompleted: (result) 
              {
                ScaffoldMessenger.of(context).showSnackBar(
                  SnackBar(
                    content: Text(result ? "Success" : "Failed"),
                  ),
                );
              },
            ),
    );
  }
}

---

Services

FaceScanner

Responsible for:

• Opening the camera
• Performing a liveness check
• Generating multiple face samples
• Returning the result through onScanCompleted

Return type:

List<String>

This represents the user's face data.

---

FaceVerify

Responsible for:

• Opening the camera
• Creating new face data
• Comparing with stored data
• Returning the verification result

Callback:

onVerifyCompleted(bool result)

---

FaceIdService

Handles all internal processing.

Responsibilities:

• Face detection
• Face data generation
• Liveness detection
• Face comparison

Both widgets use this service internally.

---

Flow

FaceScanner
     ↓
face data generated
     ↓
stored in database
     ↓
FaceVerify
     ↓
user verified

---

Customization

Some parameters can be customized.

FaceVerify(
  scanSteps: 5,
  threshold: 0.75,
  width: 320,
)

Libraries

FaceIdService

FaceScanner

FaceVerify