a11ycat-ocr

OCR PDF documents in Node.js 🐱

Dependencies

ImageMagick 7

Optional:

This is only needed if you are testing out the tess method on the OCR class. This is much faster than the recognize method on the OCR class since it uses tesseract.js, but yeilds less information.

Tesseract OCR

IMPORTANT: a11ycat-ocr expects the ImageMagick tools to be availabe in $PATH. If you are testing the tess method on the OCR class, then tesseract must also be in $PATH

Quick Start

Build the project from the repository

git clone https://github.com/devnoot/a11ycat-ocr.git a11ycat-ocr
cd a11ycat-ocr
npm install
npm build

Include the OCR class in your project

const { A11yCat } = require('../../dist/index')
const { resolve } = require('path')

const ocr = new A11yCat.OCR()

async function main() {

    try {

        // Set the path to the pdf you want to OCR
        const pdfPath = '/path/to/my.pdf'

        // Set a destination directory for the pdf images
        const destinationDir = resolve(process.cwd() + '/tmp')

        // Convert a pdf to a series of images
        const generatedImages = await ocr.convertPdfToImages(pdfPath, destinationDir) 

        // Run OCR on one of the generated images
        const textFile = await ocr.tess(generatedImages[0])

    } catch (error) {
        throw error
    }

}

main()

Tests

Tests are located in test/spec. Tests should use data from test/data/images and test/data/pdfs

Because there are some large PDFs in the test dataset, this can take a very long time depending on the host computer.

npm test