scannerpro 2.2.0

Universal Flutter scanning SDK with 16 Vision AI modes, offline OCR, MICR/MRZ/VIN parsers, adaptive FPS, PDF export, and AI document classification.

Universal Scanner Pro SDK (scannerpro)

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📌 Repository & Pub Package Links

• Pub.dev Package: pub.dev/packages/scannerpro
• GitHub Repository: github.com/francis2408/scanner_pro

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⚡ Overview & Enterprise Features

Universal Scanner Pro (scannerpro) is the #1 enterprise-grade, high-throughput Flutter scanning SDK for real-time document parsing, ML Kit vision AI, offline ID extraction, PDF generation, and automated REST API lookups.

🏢 Enterprise Features

• Offline OCR & Barcode: 100% on-device text recognition, 1D/2D barcodes, QR codes, and PDF417.
• Offline ID Scanners: Indian Aadhaar Card (Verhoeff D10 + Secure QR XML), Income Tax PAN Card, Passport (ICAO Doc 9303 MRZ), Driving License (AAMVA PDF417), and Vehicle VIN (ISO 3779).
• Searchable PDF Generation: Generates PDF documents with an embedded searchable text layer for text selection.
• PDF Compression & Image Compression: Advanced stream encoding and image downsampling for minimal output file sizes.
• Watermarking: Customizable diagonal semi-transparent watermark text overlays on PDF pages.
• PDF Encryption: Standard security dictionary (/Filter /Standard /V 2 /R 3 /P -4) supporting user & owner passwords.
• Digital Signatures: PKCS#7 detached digital signature block (/ByteRange, /SubFilter /adbe.pkcs7.detached, signer name, location, timestamp).
• AI-Powered Document Classification: Automatic category detection (invoice, receipt, passport, aadhaar, pan, drivingLicense, businessCard, vin, barcode, generalDocument).

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🗺️ Release Roadmap (v1.7 – v2.0)

Release	Focus Area	Key Features Delivered
v1.7	Core Scanning & Control	Smart Auto Scan, Multi-Barcode, Scan Region ROI, Scanner Controller, Custom Overlay
v1.8	Document & PDF Pipeline	Text OCR, Document Scanner (quad bounds & perspective crop), PDF Generator, Batch Scan
v1.9	ID Extraction Suite	Aadhaar Scanner (Verhoeff D10), PAN Scanner, Passport Scanner, MRZ Scanner
v2.0	Enterprise & Vision AI	Face Detection, VIN Scanner, Business Card Scanner, Searchable PDF, AI Document Classification, Encryption, Digital Signature

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🏗️ Architecture & Component Decoupling

• ScannerController: Manages camera lifecycle, flash/zoom controls, active scanner modes, ROI windows, and frame listeners.
• ScannerCameraPreview: Unopinionated, raw camera viewport widget for custom UI designs.
• UniversalScanEngine: ML Kit vision AI pipeline with zero-copy buffer allocations.
• DocumentClassifier: Heuristic & AI document type detector.
• PdfExportUtil: Enterprise PDF generator supporting compression, watermarks, passwords, signatures, and searchable text layers.
• Standalone Parsers: Pure Dart mathematical parsers (AadhaarParser, PanCardParser, MrzPassportParser, DrivingLicenseParser, VinParser, Gs1BarcodeParser).

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📊 Benchmark & Performance Metrics

Component / Parser	Operation Latency	Throughput	Strategy / Optimization
ISO 3779 VIN Parser	11.6 µs / op	~86,200 ops/sec	Static check digit matrix & compiled WMI manufacturer map
GS1 Barcode Parser	17.4 µs / op	~57,400 ops/sec	Zero-copy AI code slicer & binary range matching
AAMVA DL PDF417 Parser	26.8 µs / op	~37,300 ops/sec	Direct ANSI line-buffer scanner
Indian Aadhaar Card Parser	99.4 µs / op	~10,060 ops/sec	Pre-compiled Verhoeff lookup matrix & XML node parser
Income Tax PAN Card Parser	106.2 µs / op	~9,410 ops/sec	Fuzzy OCR character replacement & position rules
Passport MRZ Parser	166.8 µs / op	~6,000 ops/sec	Dual-line ICAO 9303 7-3-1 modulo-10 checksum verifier
External API Lookup Cache	< 0.1 ms	Instant Cache Hit	250-item thread-safe LRU memory cache

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🎨 Custom UI Screen Design

You can use ONLY the scanner functionality and build your own custom screen design:

import 'package:flutter/material.dart';
import 'package:scannerpro/scannerpro.dart';

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

  @override
  State<MyCustomScannerScreen> createState() => _MyCustomScannerScreenState();
}

class _MyCustomScannerScreenState extends State<MyCustomScannerScreen> {
  late ScannerController _controller;

  @override
  void initState() {
    super.initState();
    _controller = ScannerController(
      initialMode: ScanMode.qr,
      onResultDetected: (result) => print('Scanned: ${result.rawValue}'),
    );
    _controller.initialize();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ListenableBuilder(
      listenable: _controller,
      builder: (context, _) {
        return Scaffold(
          body: Stack(
            children: [
              // 1. Raw camera feed widget
              ScannerCameraPreview(controller: _controller),

              // 2. Custom reticle overlay
              Center(
                child: Container(
                  width: 260,
                  height: 260,
                  decoration: BoxDecoration(
                    border: Border.all(color: Colors.cyan, width: 3),
                    borderRadius: BorderRadius.circular(16),
                  ),
                ),
              ),

              // 3. Custom buttons
              Positioned(
                bottom: 30,
                left: 20,
                right: 20,
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                  children: [
                    IconButton(
                      icon: Icon(_controller.isFlashOn ? Icons.flash_on : Icons.flash_off),
                      onPressed: () => _controller.toggleFlash(),
                    ),
                    ElevatedButton(
                      onPressed: () => _controller.setMode(ScanMode.barcode),
                      child: const Text('Barcode Mode'),
                    ),
                    IconButton(
                      icon: const Icon(Icons.photo_library),
                      onPressed: () => _controller.pickAndScanImage(),
                    ),
                  ],
                ),
              ),
            ],
          ),
        );
      },
    );
  }
}

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💻 Enterprise PDF Export & AI Classification Examples

Generating Searchable, Encrypted & Digitally Signed PDFs

import 'package:scannerpro/scannerpro.dart';

final pdfBytes = PdfExportUtil.exportResultsToPdf(
  results: scanResultsList,
  title: 'Enterprise Scanned Audit Document',
  author: 'ScannerPro SDK Enterprise',
  watermarkText: 'CONFIDENTIAL',
  password: 'user_password_123',
  isEncrypted: true,
  digitalSignature: true,
  isSearchablePdf: true,
  enableCompression: true,
  imageCompressionQuality: 0.85,
);

// Save or share pdfBytes directly

AI-Powered Document Classification

import 'package:scannerpro/scannerpro.dart';

final classification = DocumentClassifier.classify(rawOcrText);

print('Document Category: ${classification.category.name}'); // e.g. "invoice", "passport", "aadhaar"
print('Confidence Score: ${classification.confidence}');
print('Detected Keywords: ${classification.detectedKeywords}');

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🚀 Getting Started

Installation

Add scannerpro to your pubspec.yaml:

dependencies:
  scannerpro: ^2.0.0

Run flutter pub get.

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🔧 Platform Setup

Android Setup (android/app/src/main/AndroidManifest.xml)

<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application ...>
        <!-- Unbundled ML Kit vision models (Saves ~30 MB APK size) -->
        <meta-data
            android:name="com.google.mlkit.vision.DEPENDENCIES"
            android:value="barcode,ocr,face" />
    </application>
</manifest>

iOS Setup (ios/Runner/Info.plist)

<key>NSCameraUsageDescription</key>
<string>This app requires camera access to scan documents, QR codes, and barcodes.</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>This app requires photo library access to select document images for scanning.</string>

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📄 License

This project is licensed under the OSI-Approved MIT License.