mirror of https://github.com/gchq/CyberChef.git
Update tesseract, fix API for tesseract 3.0
This commit is contained in:
Sean Marpo
parent
1b0ced9f9b
commit
1c8e37cb64
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@ -154,7 +154,7 @@
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"split.js": "^1.6.5",
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"ssdeep.js": "0.0.3",
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"stream-browserify": "^3.0.0",
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"tesseract.js": "2.1.5",
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"tesseract.js": "3.0.2",
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"ua-parser-js": "^1.0.2",
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"unorm": "^1.6.0",
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"utf8": "^3.0.0",
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@ -6,90 +6,155 @@
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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import { isImage } from "../lib/FileType.mjs";
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import { toBase64 } from "../lib/Base64.mjs";
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import { isWorkerEnvironment } from "../Utils.mjs";
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import Tesseract from "tesseract.js";
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const { createWorker } = Tesseract;
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import process from "process";
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/**
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* Optical Character Recognition operation
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*/
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class OpticalCharacterRecognition extends Operation {
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/**
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* OpticalCharacterRecognition constructor
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*/
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constructor() {
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super();
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this.name = "Optical Character Recognition";
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this.module = "OCR";
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this.description = "Optical character recognition or optical character reader (OCR) is the mechanical or electronic conversion of images of typed, handwritten or printed text into machine-encoded text.<br><br>Supported image formats: png, jpg, bmp, pbm.";
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this.infoURL = "https://wikipedia.org/wiki/Optical_character_recognition";
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this.inputType = "ArrayBuffer";
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this.outputType = "string";
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this.args = [
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{
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name: "Show confidence",
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type: "boolean",
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value: true
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}
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];
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}
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/**
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* @param {ArrayBuffer} input
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* @param {Object[]} args
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* @returns {string}
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*/
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async run(input, args) {
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const [showConfidence] = args;
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if (!isWorkerEnvironment()) throw new OperationError("This operation only works in a browser");
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const type = isImage(input);
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if (!type) {
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throw new OperationError("Invalid File Type");
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}
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const assetDir = isWorkerEnvironment() ? `${self.docURL}/assets/` : `${process.cwd()}/src/core/vendor/`;
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try {
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self.sendStatusMessage("Spinning up Tesseract worker...");
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const image = `data:${type};base64,${toBase64(input)}`;
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const worker = createWorker({
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workerPath: `${assetDir}tesseract/worker.min.js`,
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langPath: `${assetDir}tesseract/lang-data`,
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corePath: `${assetDir}tesseract/tesseract-core.wasm.js`,
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logger: progress => {
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if (isWorkerEnvironment()) {
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self.sendStatusMessage(`Status: ${progress.status}${progress.status === "recognizing text" ? ` - ${(parseFloat(progress.progress)*100).toFixed(2)}%`: "" }`);
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}
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}
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});
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await worker.load();
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self.sendStatusMessage("Loading English language...");
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await worker.loadLanguage("eng");
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self.sendStatusMessage("Intialising Tesseract API...");
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await worker.initialize("eng");
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self.sendStatusMessage("Finding text...");
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const result = await worker.recognize(image);
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if (showConfidence) {
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return `Confidence: ${result.data.confidence}%\n\n${result.data.text}`;
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} else {
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return result.data.text;
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}
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} catch (err) {
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throw new OperationError(`Error performing OCR on image. (${err})`);
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}
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}
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}
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export default OpticalCharacterRecognition;
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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import { isImage } from "../lib/FileType.mjs";
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import { toBase64 } from "../lib/Base64.mjs";
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import { isWorkerEnvironment } from "../Utils.mjs";
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import { createWorker } from "tesseract.js";
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/**
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* Optical Character Recognition operation
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*/
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class OpticalCharacterRecognition extends Operation {
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/**
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* OpticalCharacterRecognition constructor
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*/
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constructor() {
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super();
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this.name = "Optical Character Recognition";
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this.module = "OCR";
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this.description = "Optical character recognition or optical character reader (OCR) is the mechanical or electronic conversion of images of typed, handwritten or printed text into machine-encoded text.<br><br>Supported image formats: png, jpg, bmp, pbm.";
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this.infoURL = "https://wikipedia.org/wiki/Optical_character_recognition";
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this.inputType = "ArrayBuffer";
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this.outputType = "string";
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this.args = [
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{
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name: "Show confidence",
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type: "boolean",
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value: true
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},
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{
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name: "Language",
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type: "editableOptionShort",
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value: [
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{ name: "Afrikaans", value: "afr" },
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{ name: "Arabic", value: "ara" },
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{ name: "Azerbaijani", value: "aze" },
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{ name: "Belarusian", value: "bel" },
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{ name: "Bengali", value: "ben" },
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{ name: "Bulgarian", value: "bul" },
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{ name: "Catalan", value: "cat" },
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{ name: "Czech", value: "ces" },
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{ name: "Chinese", value: "chi_sim" },
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{ name: "Traditional Chinese", value: "chi_tra" },
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{ name: "Cherokee", value: "chr" },
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{ name: "Danish", value: "dan" },
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{ name: "German", value: "deu" },
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{ name: "Greek", value: "ell" },
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{ name: "English", value: "eng" },
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{ name: "English (Old)", value: "enm" },
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{ name: "Internet Meme", value: "meme" },
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{ name: "Esperanto", value: "epo" },
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{ name: "Esperanto alternative", value: "epo_alt" },
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{ name: "Estonian", value: "est" },
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{ name: "Basque", value: "eus" },
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{ name: "Finnish", value: "fin" },
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{ name: "French", value: "fra" },
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{ name: "Frankish", value: "frk" },
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{ name: "French (Old)", value: "frm" },
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{ name: "Galician", value: "glg" },
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{ name: "Ancient Greek", value: "grc" },
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{ name: "Hebrew", value: "heb" },
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{ name: "Hindi", value: "hin" },
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{ name: "Croatian", value: "hrv" },
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{ name: "Hungarian", value: "hun" },
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{ name: "Indonesian", value: "ind" },
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{ name: "Icelandic", value: "isl" },
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{ name: "Italian", value: "ita" },
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{ name: "Italian (Old)", value: "ita_old" },
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{ name: "Japanese", value: "jpn" },
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{ name: "Kannada", value: "kan" },
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{ name: "Korean", value: "kor" },
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{ name: "Latvian", value: "lav" },
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{ name: "Lithuanian", value: "lit" },
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{ name: "Malayalam", value: "mal" },
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{ name: "Macedonian", value: "mkd" },
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{ name: "Maltese", value: "mlt" },
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{ name: "Malay", value: "msa" },
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{ name: "Dutch", value: "nld" },
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{ name: "Norwegian", value: "nor" },
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{ name: "Polish", value: "pol" },
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{ name: "Portuguese", value: "por" },
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{ name: "Romanian", value: "ron" },
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{ name: "Russian", value: "rus" },
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{ name: "Slovakian", value: "slk" },
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{ name: "Slovenian", value: "slv" },
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{ name: "Spanish", value: "spa" },
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{ name: "Old Spanish", value: "spa_old" },
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{ name: "Albanian", value: "sqi" },
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{ name: "Serbian (Latin)", value: "srp" },
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{ name: "Swahili", value: "swa" },
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{ name: "Swedish", value: "swe" },
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{ name: "Tamil", value: "tam" },
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{ name: "Telugu", value: "tel" },
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{ name: "Tagalog", value: "tgl" },
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{ name: "Thai", value: "tha" },
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{ name: "Turkish", value: "tur" },
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{ name: "Ukrainian", value: "ukr" },
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{ name: "Vietnamese", value: "vie" },
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],
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defaultIndex: 14
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}
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];
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}
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/**
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* @param {ArrayBuffer} input
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* @param {Object[]} args
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* @returns {string}
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*/
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async run(input, args) {
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const [showConfidence, language] = args;
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if (!isWorkerEnvironment()) throw new OperationError("This operation only works in a browser");
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const type = isImage(input);
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if (!type) {
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throw new OperationError("Unsupported file type (supported: jpg,png,pbm,bmp) or no file provided\nOpen an image as input using the toolbar.");
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}
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try {
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self.sendStatusMessage("Spinning up Tesseract worker...");
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const image = `data:${type};base64,${toBase64(input)}`;
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const worker = createWorker({
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logger: progress => {
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if (isWorkerEnvironment()) {
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self.sendStatusMessage(`Status: ${progress.status}${progress.status === "recognizing text" ? ` - ${(parseFloat(progress.progress)*100).toFixed(2)}%`: "" }`);
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}
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}
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});
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await worker.load();
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self.sendStatusMessage(`Loading ${language} language pack...`);
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await worker.loadLanguage(language);
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self.sendStatusMessage("Intialising Tesseract API...");
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await worker.initialize(language);
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self.sendStatusMessage("Finding text...");
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const result = await worker.recognize(image);
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if (showConfidence) {
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return `Confidence: ${result.data.confidence}%\n\n${result.data.text}`;
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} else {
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return result.data.text;
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}
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} catch (err) {
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throw new OperationError(`Error performing OCR on image. (${err})`);
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}
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}
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}
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export default OpticalCharacterRecognition;
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