tesseract.js-core

What is tesseract.js-core?

tesseract.js-core is a JavaScript library that provides core functionalities for optical character recognition (OCR) using the Tesseract OCR engine. It allows developers to extract text from images directly in the browser or in a Node.js environment.

What are tesseract.js-core's main functionalities?

Basic OCR

This code demonstrates how to perform basic OCR using tesseract.js-core. It initializes a worker, loads the necessary language data, and processes an image to extract text.

const TesseractCore = require('tesseract.js-core');
const { createWorker } = require('tesseract.js');

const worker = createWorker({
  corePath: TesseractCore
});

(async () => {
  await worker.load();
  await worker.loadLanguage('eng');
  await worker.initialize('eng');
  const { data: { text } } = await worker.recognize('path/to/image.png');
  console.log(text);
  await worker.terminate();
})();

OCR with Progress Updates

This code sample shows how to perform OCR with progress updates. The logger function is used to log progress messages to the console.

const TesseractCore = require('tesseract.js-core');
const { createWorker } = require('tesseract.js');

const worker = createWorker({
  corePath: TesseractCore,
  logger: m => console.log(m)
});

(async () => {
  await worker.load();
  await worker.loadLanguage('eng');
  await worker.initialize('eng');
  const { data: { text } } = await worker.recognize('path/to/image.png');
  console.log(text);
  await worker.terminate();
})();

OCR with Multiple Languages

This code demonstrates how to perform OCR on an image using multiple languages (English and Spanish in this case).

const TesseractCore = require('tesseract.js-core');
const { createWorker } = require('tesseract.js');

const worker = createWorker({
  corePath: TesseractCore
});

(async () => {
  await worker.load();
  await worker.loadLanguage('eng+spa');
  await worker.initialize('eng+spa');
  const { data: { text } } = await worker.recognize('path/to/image.png');
  console.log(text);
  await worker.terminate();
})();

Other packages similar to tesseract.js-core

ocrad.js

ocrad.js is a JavaScript port of the OCRAD OCR engine. It is a pure JavaScript library that can be used in the browser or in Node.js. Compared to tesseract.js-core, ocrad.js is simpler and may be easier to integrate for basic OCR tasks, but it may not be as powerful or accurate as Tesseract.

node-tesseract-ocr

node-tesseract-ocr is a Node.js wrapper for the Tesseract OCR engine. It provides a simple interface for performing OCR on images. While it offers similar functionalities to tesseract.js-core, it is specifically designed for Node.js and may not be suitable for browser environments.

README

tesseract.js-core

Core part of tesseract.js, which compiles original tesseract from C to JavaScript WebAssembly.

Environment

• Emscripten: 1.38.16 (trzeci/emscripten:sdk-tag-1.38.16-64bit)
• Leptonica: 1.74.2
  • zlib: 1.2.5
  • libtiff: 3.9.4
  • libjpeg: 8.4.0
  • libpng: 1.4.22
• Tesseract: 4.0.0

Contribution

As we leverage git-submodule to manage dependencies, remember to add recursive when cloning the repository:

$ git clone --recursive https://github.com/naptha/tesseract.js-core

To build tesseract-core.js by yourself, please install docker and run:

$ sh build.sh

The genreated files will be stored in src/tesseract-core.*