flutter_tesseract_ocr 0.4.18 
flutter_tesseract_ocr: ^0.4.18 copied to clipboard
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.
import 'dart:async';
import 'dart:typed_data';
import 'package:exif/exif.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:path_provider/path_provider.dart';
import 'package:flutter_tesseract_ocr/flutter_tesseract_ocr.dart';
import 'package:flutter/services.dart' show ByteData, rootBundle;
import 'dart:io';
import 'package:image/image.dart' as im;
import 'dart:ui' as ui;
import 'package:flutter/foundation.dart';
void main() {
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: MyHomePage(title: 'Tesseract Demo'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
String _ocrText = '';
String _ocrHocr = '';
Map<String, String> tessimgs = {
"kor":
"https://raw.githubusercontent.com/khjde1207/tesseract_ocr/master/example/assets/test1.png",
"en": "https://tesseract.projectnaptha.com/img/eng_bw.png",
"ch_sim": "https://tesseract.projectnaptha.com/img/chi_sim.png",
"ru": "https://tesseract.projectnaptha.com/img/rus.png",
};
var LangList = ["kor", "eng", "deu", "chi_sim"];
var selectList = ["eng", "kor"];
String path = "";
bool bload = false;
bool bDownloadtessFile = false;
// "https://img1.daumcdn.net/thumb/R1280x0/?scode=mtistory2&fname=https%3A%2F%2Fblog.kakaocdn.net%2Fdn%2FqCviW%2FbtqGWTUaYLo%2FwD3ZE6r3ARZqi4MkUbcGm0%2Fimg.png";
var urlEditController = TextEditingController()
..text = "https://tesseract.projectnaptha.com/img/eng_bw.png";
Future<void> writeToFile(ByteData data, String path) {
final buffer = data.buffer;
return new File(path).writeAsBytes(
buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
}
void runFilePiker() async {
// android && ios only
final pickedFile =
await ImagePicker().getImage(source: ImageSource.gallery);
if (pickedFile != null) {
_ocr(pickedFile.path);
}
}
void _ocr(url) async {
if (selectList.length <= 0) {
print("Please select language");
return;
}
path = url;
if (kIsWeb == false &&
(url.indexOf("http://") == 0 || url.indexOf("https://") == 0)) {
Directory tempDir = await getTemporaryDirectory();
HttpClient httpClient = new HttpClient();
HttpClientRequest request = await httpClient.getUrl(Uri.parse(url));
HttpClientResponse response = await request.close();
Uint8List bytes = await consolidateHttpClientResponseBytes(response);
String dir = tempDir.path;
print('$dir/test.jpg');
File file = new File('$dir/test.jpg');
await file.writeAsBytes(bytes);
url = file.path;
}
var langs = selectList.join("+");
bload = true;
setState(() {});
_ocrText =
await FlutterTesseractOcr.extractText(url, language: langs, args: {
"preserve_interword_spaces": "1",
});
// ========== Test performance ==========
// DateTime before1 = DateTime.now();
// print('init : start');
// for (var i = 0; i < 10; i++) {
// _ocrText =
// await FlutterTesseractOcr.extractText(url, language: langs, args: {
// "preserve_interword_spaces": "1",
// });
// }
// DateTime after1 = DateTime.now();
// print('init : ${after1.difference(before1).inMilliseconds}');
// ========== Test performance ==========
// _ocrHocr =
// await FlutterTesseractOcr.extractHocr(url, language: langs, args: {
// "preserve_interword_spaces": "1",
// });
// print(_ocrText);
// print(_ocrText);
// === web console test code ===
// var worker = Tesseract.createWorker();
// await worker.load();
// await worker.loadLanguage("eng");
// await worker.initialize("eng");
// // await worker.setParameters({ "tessjs_create_hocr": "1"});
// var rtn = worker.recognize("https://tesseract.projectnaptha.com/img/eng_bw.png");
// console.log(rtn.data);
// await worker.terminate();
// === web console test code ===
bload = false;
setState(() {});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Stack(
children: [
Padding(
padding: EdgeInsets.all(10),
child: Column(
children: [
Row(
children: [
Container(
child: ElevatedButton(
onPressed: () {
showDialog(
context: context,
builder: (BuildContext context) {
return SimpleDialog(
title: const Text('Select Url'),
children: tessimgs
.map((key, value) {
return MapEntry(
key,
SimpleDialogOption(
onPressed: () {
urlEditController.text =
value;
setState(() {});
Navigator.pop(context);
},
child: Row(
children: [
Text(key),
Text(" : "),
Flexible(
child: Text(value)),
],
)));
})
.values
.toList(),
);
});
},
child: Text("urls")),
),
Expanded(
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'input image url',
),
controller: urlEditController,
),
),
ElevatedButton(
onPressed: () {
_ocr(urlEditController.text);
},
child: Text("Run")),
],
),
Row(
children: [
...LangList.map((e) {
return Row(children: [
Checkbox(
value: selectList.indexOf(e) >= 0,
onChanged: (v) async {
// dynamic add Tessdata
if (kIsWeb == false) {
Directory dir = Directory(
await FlutterTesseractOcr
.getTessdataPath());
if (!dir.existsSync()) {
dir.create();
}
bool isInstalled = false;
dir.listSync().forEach((element) {
String name = element.path.split('/').last;
// if (name == 'deu.traineddata') {
// element.delete();
// }
isInstalled |= name == '$e.traineddata';
});
if (!isInstalled) {
bDownloadtessFile = true;
setState(() {});
HttpClient httpClient = new HttpClient();
HttpClientRequest request =
await httpClient.getUrl(Uri.parse(
'https://github.com/tesseract-ocr/tessdata/raw/main/${e}.traineddata'));
HttpClientResponse response =
await request.close();
Uint8List bytes =
await consolidateHttpClientResponseBytes(
response);
String dir = await FlutterTesseractOcr
.getTessdataPath();
print('$dir/${e}.traineddata');
File file = new File('$dir/${e}.traineddata');
await file.writeAsBytes(bytes);
bDownloadtessFile = false;
setState(() {});
}
print(isInstalled);
}
if (selectList.indexOf(e) < 0) {
selectList.add(e);
} else {
selectList.remove(e);
}
setState(() {});
}),
Text(e)
]);
}).toList(),
],
),
Expanded(
child: ListView(
children: [
path.length <= 0
? Container()
: path.indexOf("http") >= 0
? Image.network(path)
: Image.file(File(path)),
bload
? Column(children: [CircularProgressIndicator()])
: Text(
'$_ocrText',
),
],
))
],
),
),
Container(
color: Colors.black26,
child: bDownloadtessFile
? Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
CircularProgressIndicator(),
Text('download Trained language files')
],
))
: SizedBox(),
)
],
),
floatingActionButton: kIsWeb
? Container()
: FloatingActionButton(
onPressed: () {
runFilePiker();
// _ocr("");
},
tooltip: 'OCR',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}Metadata
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Metadata
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.
Repository (GitHub)
View/report issues
License
unknown (license)
Dependencies
flutter, js, path, path_provider
