aws-lambda-tesseract

6 MB Tesseract 5.3.3 (with English training data) to fit inside AWS Lambda

Inspired by chrome-aws-lambda & lambda-scanner-ocr

Install

$ yarn add @shelf/aws-lambda-tesseract

1.x versions of this library were compiled for Node 8.10.

2.x was compiled for Node 10.x runtime.

3.x works for Node 12.x runtime.

4.x works for Node 16.x runtime and compiled with Tesseract 5.1.0. It works with x86_64 CPUs for now only.

5.x works for Node 18.x runtime and compiled with Tesseract 5.3.3. It works with arm64 CPUs.

How does it work?

This package contains an archive with Tesseract 5.3.3 compiled for usage in AWS Lambda environment.

When a Lambda starts, it unpacks an archive with a binary to the /tmp folder and makes sure it's done only once per Lambda cold start.

Usage

const {getTextFromImage, isSupportedFile} = require('@shelf/aws-lambda-tesseract');

module.exports.handler = async event => {
  // assuming there is a photo.jpg inside /tmp dir
  // original file will be deleted afterwards

  if (!isSupportedFile('/tmp/photo.jpg')) {
    return false;
  }

  return getTextFromImage('/tmp/photo.jpg');
};

isSupportedFile checks that file has image-like file extension and it's not in the list of unsupported by Tesseract file extensions.

Compile It Yourself

See compile-tesseract.sh

Smoke test that it works by running test.sh script

See Also

• aws-lambda-libreoffice
• chrome-aws-lambda-layer
• ghostscript-lambda-layer

Publish

$ git checkout master
$ yarn version
$ yarn publish
$ git push origin master --tags

License

MIT © Shelf