Secugen Fingerprint Reader

A plugin that allows you to use the native Secugen FDx Pro SDK to capture and verify fingerprints using Secugen external USB device.

Platform Support

Android
✅

Currently supported features

  • Initializing USB fingerprint device
  • Led control (On/Off)
  • Smart capture control (Enable/Disable)
  • Brightness control (Only when Smart capture is disabled)
  • Capture fingerprint
  • Capture fingerprint with Timeout and Quality
  • Auto capture fingerprint
  • Fingerprint verification
  • Fingerprint matching score

How to use

You can import the package with:

import 'package:secugenfplib/secugenfplib.dart';

Plugin Initialization

final _secugenfplib = Secugenfplib();

Initialize the Device

The Secugen USB device must be initialized before it can be used. When initializing, the USB device must be connected to the Android device through USB. The android.permission.USB_PERMISSION usb permission is requested to access the usb device during device initialization. Custom SgfplibException exception might be thrown during initialization if device is not supported or sensor not found etc.

try {
  bool? isDeviceReady = await _secugenfplib.initializeDevice();
} on SgfplibException catch (e) {
  //handle the exception
}

Led Control

The enableLed() function controls the led light of the USB device. It takes bool true/false as parameter to enable and disable the led light.

_secugenfplib.enableLed(bool val);

Smart Capture

The Secugen device drivers use Smart Capture technology to dynamically adjust brightness to ensure the best image quality. Smart Capture is enabled by default during device initialization. To manually enable or disable Smart Capture use enableSmartCapture() function with a bool type parameter.

_secugenfplib.enableSmartCapture(bool val);

Brightness Control

To manually control the quality of a captured image, the image brightness should be adjusted by changing the brightness setting using setBrightness() function. This function is ignored if Smart Capture is enabled. SgfplibException exception might be thrown if Smart Capture is enabled or brightness level value is not between 0 to 100.

try {
  await _secugenfplib.setBrightness(int brightnessLevel); // Set from 0 to 100
} on SgfplibException catch (e) {
  //handle the exception
}

Capture Fingerprint

The captureFingerprint() function is used to capture fingerprint image. It captures an image without checking for the image quality.

try {
  final captureResult = await _secugenfplib.captureFingerprint();
} on SgfplibException catch (e) {
  //handle the exception
}

The captureFingerprintWithQuality() captures fingerprint images continuously for the given time period, checks the image quality against a specified given quality value and ignores if the quality of the fingerprint is not acceptable. The timeout parameter accepts an int value in milliseconds.

try {
  final captureResult = await _secugenfplib.captureFingerprintWithQuality(timeout: TIMEOUT_IN_MS, quality: QUALITY);
} on SgfplibException catch (e) {
  //handle the exception
}

Both the captureFingerprint() and captureFingerprintWithQuality() functions return an object of type ImageCaptureResult. The ImageCaptureResult has three properties - rawBytes as (Uint8List original fingerprint bytes), imageBytes as (Uint8List image representable bytes) and quality as (int quality of the image). SgfplibException exception might be thrown if no fingerprint is present.

Auto Capture

The captureFingerprint() and captureFingerprintWithQuality() both functions support auto capture. If auto capture is on, the attached fingerprint device continuously checks for the presence of a finger. An image is returned if any fingerprint is detected.

final captureResult = await _secugenfplib.captureFingerprint(auto: bool isAutoOn);

final captureResult = await _secugenfplib.captureFingerprintWithQuality(timeout: TIMEOUT_IN_MS, quality: QUALITY, auto: bool isAutoOn);

Fingerprint Verification

The verifyFingerprint() function uses two raw bytes from two different fingerprint ImageCaptureResult for verification. It creates a template for each fingerprint bytes and uses these templates for matching.

try {
  bool? isMatch = await _secugenfplib.verifyFingerprint(firstBytes: FIRST_RAW_BYTES, secondBytes: SECOND_RAW_BYTES);
} on SgfplibException catch (e) {
  //handle the exception
}

Fingerprint Matching Score

To manually determine the verification of two fingerprints, a matching score can be used. The getMatchingScore() function returns a score comparing two raw fingerprint bytes of ImageCaptureResult. The score can be between 0 to 200. The higher the score, the higher the matching accuracy is.

try {
  int? score = await _secugenfplib.getMatchingScore(firstBytes: FIRST_RAW_BYTES, secondBytes: SECOND_RAW_BYTES);
} on SgfplibException catch (e) {
  //handle the exception
}

Example App

Additional Configuration

Add the configuration below to your Android manifest, if you want your app to open automatically whenever the USB device is connected. If USB permission is granted, this configuration allows your app to open immediately after the USB device is connected to the Android device.

Inside the <activity></activity> tag, add:

<intent-filter>
    <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
</intent-filter>

<meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
    android:resource="@xml/device_filter" />

Next, inside the app >> src >> main >> res >> xml directory, add an xml file name device_filter.xml. Copy and paste the xml code below in the device_filter.xml file:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!--SecuGen SDU03P 0x1162 0x1000-->
    <usb-device vendor-id="4450" product-id="4096" />
    <!--SecuGen SDU04P  0x1162 0x2000-->
    <usb-device vendor-id="4450" product-id="8192" />
    <!--SecuGen U20  0x1162 0x2200-->
    <usb-device	vendor-id="4450" product-id="8704" />
    <!--SecuGen U20-2  0x1162 0x22BA-->
    <usb-device	vendor-id="4450" product-id="8890" />
    <!--SecuGen UPx  0x1162 0x2201-->
    <usb-device	vendor-id="4450" product-id="8705" />
    <!--SecuGen U10  0x1162 0x2203-->
    <usb-device	vendor-id="4450" product-id="8707" />
    <!--SecuGen U20-AP  0x1162 0x2220-->
    <usb-device	vendor-id="4450" product-id="8736" />
    <!--SecuGen U20-A  0x1162 0x2240-->
    <usb-device	vendor-id="4450" product-id="8768" />
    <!--SecuGen U20-AP-A  0x1162 0x2360-->
    <usb-device	vendor-id="4450" product-id="9056" />
    <!--SecuGen U30-A  0x1162 0x2410-->
    <usb-device	vendor-id="4450" product-id="9232" />
    <!--SecuGen U-AIR  0x1162 0x2500-->
    <usb-device	vendor-id="4450" product-id="9472" />
</resources>

Libraries

models/image_capture_result
secugenfplib
secugenfplib_method_channel
secugenfplib_platform_interface
utils/barrels
utils/constants
utils/sgfplib_exception