learning_barcode_scanning

Description:

learning barcode scanning

ML Barcode Scanning #
The easy way to use ML Kit for barcode scanning in Flutter.
With ML Kit's barcode scanning, we can read data encoded using most standard barcode formats. Barcode scanning happens on-device, and doesn't require a network connection.
Barcodes are a convenient way to pass information from the real world to our application. In particular, when using 2D formats such as QR code, we can encode structured data such as contact information or WiFi network credentials. Because it can automatically recognize and parse this data, the application can respond intelligently when a user scans a barcode.

Supported formats
Linear: Codabar, Code 39, Code 93, Code 128, EAN-8, EAN-13, ITF, UPC-A, UPC-E
2D: Aztec, Data Matrix, PDF417, QR Code
Getting Started #
Add dependency to your flutter project:
$ flutter pub add learning_barcode_scanning
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or
dependencies:
learning_barcode_scanning: ^0.0.2
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Then run flutter pub get.
Usage #
import 'package:learning_barcode_scanning/learning_barcode_scanning.dart';
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Input Image #
As in other ML vision plugins, input is fed as an instance of InputImage, which is part of package learning_input_image.
You can use widget InputCameraView from learning_input_image as default implementation for processing image (or image stream) from camera / storage into InputImage format. But feel free to learn the inside of InputCameraView code if you want to create your own custom implementation.
Here is example of using InputCameraView to get InputImage for barcode scanning.
import 'package:learning_input_image/learning_input_image.dart';

InputCameraView(
title: 'Barcode Scanning',
onImage: (InputImage image) {
// now we can feed the input image into barcode scanner
},
)
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Barcode Scanning #
After getting the InputImage, we can start detecting faces by calling method scan from an instance of BarcodeScanner.
BarcodeScanner scanner = BarcodeScanner(formats: [
BarcodeFormat.QR_CODE,
BarcodeFormat.CODE_128,
BarcodeFormat.CODE_39,
BarcodeFormat.CODE_93,
BarcodeFormat.EAN_13,
BarcodeFormat.EAN_8,
BarcodeFormat.ITF,
BarcodeFormat.UPC_A,
BarcodeFormat.UPC_E,
BarcodeFormat.CODABAR,
BarcodeFormat.DATA_MATRIX,
BarcodeFormat.PDF417
]);

List result = await scanner.scan(image);
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Output #
Output of barcode scanning process is a list of Barcode object, which is divided into many subclasses depending of its type.
Here is a general data contains within a Barcode object.
BarcodeType type // type of the Barcode object
String value // the raw value inside the barcode
Rect? boundingBox // bounding box of barcode position in image
List<Offset> corners // list of points representing the corners position of this barcode
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Here is a list of BarcodeType values with its corresponding Barcode object. Each Barcode object is a direct subclass of Barcode.
Dispose #scanner.dispose();
copied to clipboardExample Project #You can learn more from example project here.

BarcodeType
Barcode Object
Additonal Data


TEXT
BarcodeText
displayValue


URL
BarcodeUrl
title url


EMAIL
BarcodeEmail
emailType address subject body


PHONE
BarcodePhone
phoneType number


SMS
BarcodeSms
number message


WIFI
BarcodeWifi
wifiType ssid password


CALENDAR_EVENT
BarcodeCalendarEvent
status summary description location start end organizer


CONTACT_INFO
BarcodeContactInfo
title name organization emails phones addresses urls


DRIVER_LICENSE
BarcodeDriverLicense
documentType licenseNumber firstName middleName lastName gender birthDate street city state zip issueDate expiryDate issuingCountry


GEO
BarcodeGeo
latitude longitude


ISBN
BarcodeISBN



PRODUCT
BarcodeProduct



UNKNOWN