ngx-image-id-detector/esm2020/lib/ngx-image-id-detector.service.mjs

A package that detects if an image is a Vietnamese citizen ID using Tesseract.js

import { Injectable } from '@angular/core';
import { createWorker, PSM } from 'tesseract.js';
import { from } from 'rxjs';
import { map, catchError } from 'rxjs/operators';
import * as i0 from "@angular/core";
export class DetectIdService {
    constructor() {
        this.SIDE_PATTERNS = new Map([
            ['front', [
                    'CANCUCCONGDAN',
                    'CONGHAXHICHNGHAVITNAM',
                    'CNGHAXHICHNGHAVIETNAM',
                    'CONGHOAXAHOICHUNGHIAVIETNAM',
                    'ĐOCLAPTUDOHANHPHUC',
                    'HOVATENEULLNAME',
                    'DENTITYCARD'
                ]],
            ['back', [
                    'ĐACĐIEMNHANDANGPERSONALIDENTIICATION',
                    'CUCTRUONGCUCCANHSAT',
                    'DANGPERSONALIDENTILICATION',
                    'CUCCANHSAT',
                    'NGONTROTRAI',
                    'NGONTROPHAI',
                    'CCTRUNGCCCNH',
                    'QUNLHNHCHNHVETRATTUXAHĐHU',
                    'THEPOLICEDEPARTMENT',
                    'NHANDANGPERSONALIDENTILICATI',
                    'BOGONGANIUISRYOEPUBLICSECURITY',
                    'SINHPACEOBIRIH'
                ]]
        ]);
    }
    detectIdCard(file, options) {
        return from(this.processImage(file, options)).pipe(map(result => result), catchError(error => {
            console.error('OCR Processing Error:', error);
            throw new Error('Không thể xử lý hình ảnh CCCD. Vui lòng thử lại.');
        }));
    }
    async processImage(file, options) {
        const { language = 'vie', whitelist = 'AĂÂBCDĐEÊGHIKLMNOÔƠPQRSTUƯVXYZaăâbcdđeêghiklmnoôơpqrstuưvxyz' +
            'ÀÁẢÃẠÂẤẦẨẪẬĂẮẰẲẴẶĐÈÉẺẼẸÊẾỀỂỄỆÌÍỈĨỊÒÓỎÕỌÔỐỒỔỖỘƠỚỜỞỠỢÙÚỦŨỤƯỨỪỬỮỰ' +
            'àáảãạâấầẩẫậăắằẳẵặđèéẻẽẹêếềểễệìíỉĩịòóỏõọôốồổỗộơớờởỡợùúủũụưứừửữự' +
            'ÝỲỶỸỴýỳỷỹỵ', logger } = options || {};
        let worker = null;
        try {
            worker = await createWorker(language, 1, { logger });
            await worker.setParameters({
                tessedit_char_whitelist: whitelist,
                tessedit_pageseg_mode: PSM.AUTO_OSD,
            });
            const { data: { text } } = await worker.recognize(file, { rotateAuto: true });
            const normalizedText = this.normalizeText(text);
            for (const [side, patterns] of this.SIDE_PATTERNS.entries()) {
                if (patterns.some(p => normalizedText.includes(this.normalizeText(p)))) {
                    return { side, text: normalizedText };
                }
            }
            return { side: 'unknown', text: normalizedText };
        }
        catch (error) {
            throw new Error('Không thể xử lý hình ảnh. Vui lòng kiểm tra lại ảnh CCCD.');
        }
        finally {
            if (worker) {
                await worker.terminate();
            }
        }
    }
    normalizeText(text) {
        return text
            .toUpperCase()
            .normalize('NFD')
            .replace(/[\u0300-\u036f]/g, '') // Remove diacritics
            .replace(/\s+/g, ' ') // Normalize spaces
            .trim();
    }
}
DetectIdService.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.2.7", ngImport: i0, type: DetectIdService, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
DetectIdService.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "13.2.7", ngImport: i0, type: DetectIdService, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.2.7", ngImport: i0, type: DetectIdService, decorators: [{
            type: Injectable,
            args: [{
                    providedIn: 'root'
                }]
        }] });
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