This Cordova plugin adds support for the OpenALPR (Automatic License Plate Recognition) library which provides support for retrieving the license plate from a picture. You can pass an image using Base64 or the file path to the OpenALPR plugin.
The current master branch supports the following platforms:
- iOS (>= 8)
- Android (>= SDK 21)
This plugin requires Cordova 5.0+ and can be installed from the Cordova Plugin Registry. If you use Ionic 3 or Ionic 4, you should also install the @ionic-native binding.
cordova plugin add cordova-plugin-openalpr
npm install @ionic-native/openalpr
This plugin defines a global cordova.plugins.OpenALPR object which provides an API for scanning license plates. It is possible to use the output of cordova-plugin-camera and pass it to the scan function of this plugin.
cordova.plugins.OpenALPR.scan(
filepath,
{ country: "eu", amount: 3 },
function(results) {
console.log(results);
},
function(error) {
console.log(error.code + ": " + error.message);
}
);This plugin has a @ionic-native/openalpr binding available, which makes it easy to include it in your Ionic 3 project. You can use the output of @ionic-native/camera and pass it to the scan function of this plugin.
There is also an Ionic 3 example project available which shows the possible implementation of cordova-plugin-openalpr.
import { Camera, CameraOptions } from '@ionic-native/camera';
import { OpenALPR, OpenALPROptions, OpenALPRResult } from 'cordova-plugin-openalpr/native';
constructor(private camera: Camera, private openALPR: OpenALPR) {
}
const cameraOptions: CameraOptions = {
quality: 100,
destinationType: this.camera.DestinationType.FILE_URI,
encodingType: this.camera.EncodingType.JPEG,
mediaType: this.camera.MediaType.PICTURE,
sourceType: this.camera.PictureSourceType.CAMERA
}
const scanOptions: OpenALPROptions = {
country: this.openalpr.Country.EU,
amount: 3
}
this.camera.getPicture(cameraOptions).then((imageData) => {
this.openALPR.scan(imageData)
.then((result: [OpenALPRResult]) => console.log(result[0].number))
.catch((error: Error) => console.error(error));
});This plugin is only supported on iOS / Android, however in order to speed up development you can make use of mocking and browser development.
This plugin has a @ionic-native/openalpr binding available, which makes it easy to include it in your Ionic 4 project. You can use the output of @ionic-native/camera and pass it to the scan function of this plugin. (Check the code snippet for Ionic 3 for a reference).
There is also an Ionic 4 example project available which shows the possible implementation of cordova-plugin-openalpr.
In Android apps, passing the file uri from PictureSourceType.PHOTOLIBRARY isn't supported yet. This is because the photolibrary returns a different kind of path than the camera does. The cordova-plugin-filepath might provide a workaround for now but this has not been tested yet.
- This project includes prebuilt OpenALPR libraries for iOS and Android, because the compilation of the OpenALPR framework requires a lot of effort and dependencies.
- This project is not used in production anymore and won't be maintained actively. We can't guarantee that we can respond quickly to issues / pull requests, however we will keep an eye on the repository.
MIT, but keep in mind that OpenALPR itself is licensed under AGPL-3.0.
- License plate scanning based on OpenALPR.
- iOS platform support based on OpenALPR iOS.
- Android platform support based on OpenALPR Java bindings
- iOS Base64 implementation by @baukeroo
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