flutter_tesseract_ocr 0.4.12

Tesseract 4 adds a new neural net (LSTM) based OCR engine which is focused on line recognition. It has unicode (UTF-8) support, and can recognize more than 100 languages.

example/lib/main.dart

import 'dart:async';
import 'package:camera/camera.dart';
import 'package:example/Demos/TextDetectorFromCamera.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'dart:io';
import 'Demos/TextDetector.dart';

late List<CameraDescription> cameras;
Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  if (!kIsWeb) {
    cameras = await availableCameras();
  }
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Tesseract Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Home(),
    );
  }
}

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Tesseract Demo'),
        centerTitle: true,
        elevation: 0,
      ),
      body: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            child: Padding(
              padding: EdgeInsets.symmetric(horizontal: 16),
              child: Column(
                children: [
                  CustomCard(
                    'Text Detector',
                    TextDetector(
                      title: "Extract text From File",
                    ),
                    featureCompleted: true,
                  ),
                  kIsWeb
                      ? Container()
                      : CustomCard(
                          'Tesseract OCR Live (IOS)',
                          TextDetectorView(),
                          featureCompleted: true,
                        ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}

class CustomCard extends StatelessWidget {
  final String _label;
  final Widget _viewPage;
  final bool featureCompleted;

  const CustomCard(this._label, this._viewPage,
      {this.featureCompleted = false});

  @override
  Widget build(BuildContext context) {
    return Card(
      elevation: 5,
      margin: EdgeInsets.only(bottom: 10),
      child: ListTile(
        tileColor: Theme.of(context).primaryColor,
        title: Text(
          _label,
          style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
        ),
        onTap: () {
          if (!kIsWeb && Platform.isIOS && !featureCompleted) {
            ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                content: const Text(
                    'This feature has not been implemented for iOS yet')));
          } else
            Navigator.push(
                context, MaterialPageRoute(builder: (context) => _viewPage));
        },
      ),
    );
  }
}

void logError(String code, String? message) {
  if (message != null) {
    print('Error: $code\nError Message: $message');
  } else {
    print('Error: $code');
  }
}

/// Returns a suitable camera icon for [direction].
IconData getCameraLensIcon(CameraLensDirection direction) {
  switch (direction) {
    case CameraLensDirection.back:
      return Icons.camera_rear;
    case CameraLensDirection.front:
      return Icons.camera_front;
    case CameraLensDirection.external:
      return Icons.camera;
    default:
      throw ArgumentError('Unknown lens direction');
  }
}