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OCR operation now relies on local files

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n1474335 2019-09-13 17:40:20 +01:00
parent 3539e065fa
commit 70346bce35
8 changed files with 259 additions and 3 deletions
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196
package-lock.json generated
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@ -3497,6 +3497,170 @@
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@ -4358,6 +4522,32 @@
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@ -11682,6 +11872,12 @@
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1
package.json
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@ -45,6 +45,7 @@
"babel-plugin-dynamic-import-node": "^2.3.0",
"chromedriver": "^76.0.1",
"colors": "^1.3.3",
"copy-webpack-plugin": "^5.0.4",
"css-loader": "^3.2.0",
"eslint": "^6.2.2",
"exports-loader": "^0.7.0",

14
src/core/operations/OpticalCharacterRecognition.mjs
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@ -14,6 +14,8 @@ import { isWorkerEnvironment } from "../Utils.mjs";
import Tesseract from "tesseract.js";
const { TesseractWorker } = Tesseract;
import process from "process";
/**
* Optical Character Recognition operation
*/
@ -26,7 +28,7 @@ class OpticalCharacterRecognition extends Operation {
super();
this.name = "Optical Character Recognition";
this.module = "Image";
this.module = "OCR";
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.";
this.infoURL = "https://wikipedia.org/wiki/Optical_character_recognition";
this.inputType = "ArrayBuffer";
@ -48,14 +50,22 @@ class OpticalCharacterRecognition extends Operation {
async run(input, args) {
const [showConfidence] = args;
if (!isWorkerEnvironment()) throw OperationError("This operation only works in a browser");
const type = isImage(input);
if (!type) {
throw new OperationError("Invalid File Type");
}
const assetDir = isWorkerEnvironment() ? `${self.docURL}/assets/` : `${process.cwd()}/src/core/vendor/`;
try {
const image = `data:${type};base64,${toBase64(input)}`;
const worker = new TesseractWorker();
const worker = new TesseractWorker({
workerPath: `${assetDir}/tesseract/worker.min.js`,
langPath: `${assetDir}/tesseract/lang-data/`,
corePath: `${assetDir}/tesseract/tesseract-core.wasm.js`,
});
const result = await worker.recognize(image)
.progress(progress => {
if (isWorkerEnvironment()) {

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src/core/vendor/tesseract/worker.min.js vendored Normal file
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2
tests/operations/tests/Image.mjs
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@ -248,7 +248,7 @@ TestRegister.addTests([
}
]
},
/*{ Commented out as it takes a while to run and drops a file to disk (eng.traineddata)
/*{ This operation only works in a browser
name: "Optical Character Recognition",
input: "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",
expectedOutput: "Tesseract.js\n",

8
webpack.config.js
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@ -1,5 +1,6 @@
const webpack = require("webpack");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CopyWebpackPlugin = require("copy-webpack-plugin");
const path = require("path");
/**
@ -50,6 +51,13 @@ module.exports = {
new MiniCssExtractPlugin({
filename: "assets/[name].css"
}),
new CopyWebpackPlugin([
{
context: "src/core/vendor/",
from: "tesseract/**/*",
to: "assets/"
}
])
],
resolve: {
alias: {