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@@ -1,6 +1,7 @@
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/**
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* @author n1474335 [n1474335@gmail.com]
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* @author mshwed [m@ttshwed.com]
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+ * @author Matt C [me@mitt.dev]
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* @copyright Crown Copyright 2019
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* @license Apache-2.0
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*/
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@@ -12,7 +13,7 @@ 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 { TesseractWorker } = Tesseract;
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+const { createWorker } = Tesseract;
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import process from "process";
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@@ -60,23 +61,30 @@ class OpticalCharacterRecognition extends Operation {
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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 = new TesseractWorker({
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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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- });
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- const result = await worker.recognize(image)
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- .progress(progress => {
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+ logger: progress => {
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if (isWorkerEnvironment()) {
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- self.sendStatusMessage(`Status: ${progress.status} - ${(parseFloat(progress.progress)*100).toFixed(2)}%`);
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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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+ });
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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: ${result.confidence}%\n\n${result.text}`;
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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.text;
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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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