A simple wrapper for the Tesseract OCR package for node.js
- Tesseract 3.01 or higher is needed for this to work
There is a hard dependency on the Tesseract project. You can find installation instructions for various platforms on the project site. For Homebrew users, the installation is quick and easy.
brew install tesseract --all-languages
The above will install all of the language packages available, if you don't need them all you can remove the --all-languages
flag and install them manually, by downloading them to your local machine and then exposing the TESSDATA_PREFIX
variable into your path:
export TESSDATA_PREFIX=~/Downloads/
You can then go about installing the node-module to expose the JavaScript API:
npm install node-tesseract
var tesseract = require('node-tesseract');
// Recognize text of any language in any format
tesseract.process(__dirname + '/path/to/image.jpg',function(err, text) {
if(err) {
console.error(err);
} else {
console.log(text);
}
});
// Recognize German text in a single uniform block of text and set the binary path
var options = {
l: 'deu',
psm: 6,
binary: '/usr/local/bin/tesseract'
};
tesseract.process(__dirname + '/path/to/image.jpg', options, function(err, text) {
if(err) {
console.error(err);
} else {
console.log(text);
}
});
- 0.2.7: Adds output file extension detection
- 0.2.6: Catches exception when deleting tmp files that do not exist
- 0.2.5: Preserves whitespace and replaces tmp module
- 0.2.4: Removes console logging for messaging
- 0.2.3: The ability to set the binary path via the config object. Better installation documentation.
- 0.2.2: Adds test converage to utils module
- 0.2.1: Strips leading & trailing whitespace from output by default
- 0.2.0: Adds ability to pass options via a configuration object.
- 0.1.1: Updates tmp module.
- 0.1.0: Removes preprocessing functionatlity. See #3.
- 0.0.3: Adds basic test coverage for process method
- 0.0.2: Pulls in changes by joscha including: refactored to support tesseract 3.01, added language parameter, config parameter, documentation, Added support for custom preprocessors, OTB Preprocessor using ImageMagick 'convert'
- 0.0.1: Initial version