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Ionic v3 OCR
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| <ion-header> | |
| <ion-navbar> | |
| <ion-title> | |
| OCR Ionic 3 | |
| </ion-title> | |
| </ion-navbar> | |
| </ion-header> | |
| <ion-content padding> | |
| <span>{{recognizedText}}</span> | |
| <img src="assets/img/demo.png" #demoImg class="start-api" /> | |
| <img [src]="image" #imageResult /> | |
| <div *ngIf="_ocrIsLoaded && !image"> | |
| <img src="assets/img/Start-arrow.png" #start class="start-arrow" /> | |
| </div> | |
| <div *ngIf="image && showEditFilters"> | |
| <ion-list> | |
| <ion-list-header> | |
| Adjust Image Filters | |
| </ion-list-header> | |
| <ion-item> | |
| <ion-label>Brightness</ion-label> | |
| <ion-range min="-100" max="100" pin="true" step="1" [(ngModel)]="brightness" color="secondary"> | |
| <ion-icon range-left small name="sunny"></ion-icon> | |
| <ion-icon range-right name="sunny"></ion-icon> | |
| </ion-range> | |
| </ion-item> | |
| <ion-item> | |
| <ion-label>Contrast</ion-label> | |
| <ion-range min="-100" max="100" pin="true" step="1" [(ngModel)]="contrast" color="secondary"> | |
| <ion-icon range-left small name="contrast"></ion-icon> | |
| <ion-icon range-right name="contrast"></ion-icon> | |
| </ion-range> | |
| </ion-item> | |
| <ion-item> | |
| <ion-label>UnsharpMask Radius</ion-label> | |
| <ion-range min="0" max="200" pin="true" step="1" [(ngModel)]="unsharpMask.radius" color="secondary"> | |
| <ion-icon range-left small name="ios-radio"></ion-icon> | |
| <ion-icon range-right name="ios-radio"></ion-icon> | |
| </ion-range> | |
| </ion-item> | |
| <ion-item> | |
| <ion-label>UnsharpMask Strength</ion-label> | |
| <ion-range min="0" max="5" step="0.5" pin="true" [(ngModel)]="unsharpMask.strength" color="secondary"> | |
| <ion-icon range-left small name="md-cog"></ion-icon> | |
| <ion-icon range-right name="md-cog"></ion-icon> | |
| </ion-range> | |
| </ion-item> | |
| <ion-item> | |
| <ion-label>Hue</ion-label> | |
| <ion-range min="-100" max="100" pin="true" step="1" [(ngModel)]="hue" color="secondary"> | |
| <ion-icon range-left small name="md-color-palette"></ion-icon> | |
| <ion-icon range-right name="md-color-palette"></ion-icon> | |
| </ion-range> | |
| </ion-item> | |
| <ion-item> | |
| <ion-label>Saturation</ion-label> | |
| <ion-range min="-100" max="100" pin="true" step="1" [(ngModel)]="saturation" color="secondary"> | |
| <ion-icon range-left small name="thermometer"></ion-icon> | |
| <ion-icon range-right name="thermometer"></ion-icon> | |
| </ion-range> | |
| </ion-item> | |
| </ion-list> | |
| </div> | |
| <ion-fab right bottom> | |
| <button ion-fab (click)="openMenu()" color="danger"><ion-icon name="add"></ion-icon></button> | |
| </ion-fab> | |
| </ion-content> |
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| import { Component, ViewChild, ElementRef, NgZone } from '@angular/core'; | |
| import { NavController } from 'ionic-angular'; | |
| import { Camera } from '@ionic-native/camera'; | |
| import { Platform, ActionSheetController, LoadingController } from 'ionic-angular'; | |
| import Tesseract from 'tesseract.js'; | |
| @Component({ | |
| selector: 'page-home', | |
| templateUrl: 'home.html' | |
| }) | |
| export class HomePage { | |
| @ViewChild('imageResult') private imageResult: ElementRef; | |
| @ViewChild('demoImg') private demoImg: ElementRef; | |
| private recognizedText: string; | |
| image: string = ''; | |
| _zone: any; | |
| _ocrIsLoaded: boolean = false; | |
| brightness: number = 12; | |
| contrast: number = 52; | |
| unsharpMask: any = { radius: 100, strength: 2 }; | |
| hue: number = -100; | |
| saturation: number = -100; | |
| showEditFilters: boolean = false; | |
| constructor( | |
| private camera: Camera, | |
| public navCtrl: NavController, | |
| public platform: Platform, | |
| public loadingCtrl: LoadingController, | |
| public actionsheetCtrl: ActionSheetController) { | |
| this._zone = new NgZone({ enableLongStackTrace: false }); | |
| } | |
| openMenu() { | |
| if (this._ocrIsLoaded === true) { | |
| let actionSheet; | |
| if (!this.image) { | |
| actionSheet = this.actionsheetCtrl.create({ | |
| title: 'Actions', | |
| cssClass: 'action-sheets-basic-page', | |
| buttons: [ | |
| { | |
| text: 'Random demo', | |
| icon: !this.platform.is('ios') ? 'shuffle' : null, | |
| handler: () => { | |
| this.randomDemo() | |
| } | |
| }, | |
| { | |
| text: 'Take Photo', | |
| icon: !this.platform.is('ios') ? 'camera' : null, | |
| handler: () => { | |
| this.takePicture() | |
| } | |
| }, | |
| { | |
| text: 'Cancel', | |
| role: 'cancel', // will always sort to be on the bottom | |
| icon: !this.platform.is('ios') ? 'close' : null, | |
| handler: () => { | |
| console.log('Cancel clicked'); | |
| } | |
| } | |
| ] | |
| }); | |
| } | |
| else { | |
| actionSheet = this.actionsheetCtrl.create({ | |
| title: 'Actions', | |
| cssClass: 'action-sheets-basic-page', | |
| buttons: [ | |
| { | |
| text: 'Random demo', | |
| icon: !this.platform.is('ios') ? 'shuffle' : null, | |
| handler: () => { | |
| this.randomDemo() | |
| } | |
| }, | |
| { | |
| text: 'Re-Take photo', | |
| icon: !this.platform.is('ios') ? 'camera' : null, | |
| handler: () => { | |
| this.takePicture() | |
| } | |
| }, | |
| { | |
| text: 'Apply filters', | |
| icon: !this.platform.is('ios') ? 'barcode' : null, | |
| handler: () => { | |
| this.filter() | |
| } | |
| }, | |
| { | |
| text: 'Clean filters', | |
| icon: !this.platform.is('ios') ? 'refresh' : null, | |
| handler: () => { | |
| this.restoreImage() | |
| } | |
| }, | |
| { | |
| text: this.showEditFilters == false ? 'Customize filters' : 'Hide customization filters', | |
| icon: !this.platform.is('ios') ? 'hammer' : null, | |
| handler: () => { | |
| this.showEditFilters = this.showEditFilters == false ? true : false; | |
| } | |
| }, | |
| { | |
| text: 'Read image', | |
| icon: !this.platform.is('ios') ? 'analytics' : null, | |
| handler: () => { | |
| this.analyze(this.imageResult.nativeElement.src, false); | |
| } | |
| }, | |
| { | |
| text: 'Cancel', | |
| role: 'cancel', // will always sort to be on the bottom | |
| icon: !this.platform.is('ios') ? 'close' : null, | |
| handler: () => { | |
| console.log('Cancel clicked'); | |
| } | |
| } | |
| ] | |
| }); | |
| } | |
| actionSheet.present(); | |
| } | |
| else { | |
| alert('OCR API is not loaded'); | |
| } | |
| } | |
| restoreImage() { | |
| if (this.image) { | |
| this.imageResult.nativeElement.src = this.image; | |
| } | |
| } | |
| takePicture() { | |
| let loader = this.loadingCtrl.create({ | |
| content: 'Please wait...' | |
| }); | |
| loader.present(); | |
| // Take a picture saving in device, as jpg and allows edit | |
| this.camera.getPicture({ | |
| quality: 100, | |
| destinationType: this.camera.DestinationType.NATIVE_URI, | |
| encodingType: this.camera.EncodingType.JPEG, | |
| targetHeight: 1000, | |
| sourceType: 1, | |
| allowEdit: true, | |
| saveToPhotoAlbum: true, | |
| correctOrientation: true | |
| }).then((imageURI) => { | |
| loader.dismissAll(); | |
| this.image = imageURI; | |
| }, (err) => { | |
| console.log(`ERROR -> ${JSON.stringify(err)}`); | |
| }); | |
| } | |
| filter() { | |
| /// Initialization of glfx.js | |
| /// is important, to use js memory elements | |
| /// access to Window element through (<any>window) | |
| try { | |
| var canvas = (<any>window).fx.canvas(); | |
| } catch (e) { | |
| alert(e); | |
| return; | |
| } | |
| /// taken from glfx documentation | |
| var imageElem = this.imageResult.nativeElement; // another trick is acces to DOM element | |
| var texture = canvas.texture(imageElem); | |
| canvas.draw(texture) | |
| .hueSaturation(this.hue / 100, this.saturation / 100)//grayscale | |
| .unsharpMask(this.unsharpMask.radius, this.unsharpMask.strength) | |
| .brightnessContrast(this.brightness / 100, this.contrast / 100) | |
| .update(); | |
| /// replace image src | |
| imageElem.src = canvas.toDataURL('image/png'); | |
| } | |
| analyze(image, loadAPI) { | |
| let loader = this.loadingCtrl.create({ | |
| content: 'Please wait...' | |
| }); | |
| loader.present(); | |
| if (loadAPI == true) { | |
| this._ocrIsLoaded = false; | |
| } | |
| /// Recognize data from image | |
| Tesseract.recognize(image, {}) | |
| .progress((progress) => { | |
| this._zone.run(() => { | |
| loader.setContent(`${progress.status}: ${Math.floor(progress.progress * 100)}%`) | |
| console.log('progress:', progress); | |
| }) | |
| }) | |
| .then((tesseractResult) => { | |
| this._zone.run(() => { | |
| loader.dismissAll(); | |
| if (loadAPI == true) { | |
| this._ocrIsLoaded = true; | |
| } | |
| console.log('Tesseract result: '); | |
| console.log(tesseractResult); | |
| /// Show a result if data isn't initializtion | |
| if (loadAPI != true) { this.recognizedText = tesseractResult.text; } | |
| }); | |
| }); | |
| } | |
| randomDemo(){ | |
| } | |
| ionViewDidLoad() { | |
| console.log('loaded') | |
| this.analyze(this.demoImg.nativeElement.src, true); | |
| } | |
| } |
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