1. module node-tesseract
   1. function node-tesseract.process (image, options, callback)
   2. object node-tesseract.tesseract
   3. object node-tesseract.utils
2. module node-tesseract.tesseract
   1. function node-tesseract.tesseract.process (image, options, callback)
3. module node-tesseract.utils
   1. function node-tesseract.utils.merge (defaults, options)

module node-tesseract

function node-tesseract.process (image, options, callback)

• description and source-code

  process = function (image, options, callback) {
  
    if (typeof options === 'function') {
      callback = options;
      options = null;
    }
  
    options = utils.merge(Tesseract.options, options);
  
    // generate output file name
    var output = path.resolve(tmpdir, 'node-tesseract-' + uuid.v4());
  
    // add the tmp file to the list
    Tesseract.tmpFiles.push(output);
  
    // assemble tesseract command
    var command = [options.binary, image, output];
  
    if (options.l !== null) {
      command.push('-l ' + options.l);
    }
  
    if (options.psm !== null) {
      command.push('-psm ' + options.psm);
    }
  
    if (options.config !== null) {
      command.push(options.config);
    }
  
    command = command.join(' ');
  
    var opts = options.env || {};
  
    // Run the tesseract command
    exec(command, opts, function(err) {
      if (err) {
        // Something went wrong executing the assembled command
        callback(err, null);
        return;
      }
  
      // Find one of the three possible extension
      glob(output + '.+(html|hocr|txt)', function(err, files){
        if (err) {
          callback(err, null);
          return;
        }
        fs.readFile(files[0], Tesseract.outputEncoding, function(err, data) {
          if (err) {
            callback(err, null);
            return;
          }
  
          var index = Tesseract.tmpFiles.indexOf(output);
          if (~index) Tesseract.tmpFiles.splice(index, 1);
  
          fs.unlink(files[0]);
  
          callback(null, data)
        });
      })
    }); // end exec
  
  }

• example usage

  ...
  
  ## Usage
  
  ```JavaScript
  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);
  	}
  });
  ...

module node-tesseract.tesseract

function node-tesseract.tesseract.process (image, options, callback)

• description and source-code

  process = function (image, options, callback) {
  
    if (typeof options === 'function') {
      callback = options;
      options = null;
    }
  
    options = utils.merge(Tesseract.options, options);
  
    // generate output file name
    var output = path.resolve(tmpdir, 'node-tesseract-' + uuid.v4());
  
    // add the tmp file to the list
    Tesseract.tmpFiles.push(output);
  
    // assemble tesseract command
    var command = [options.binary, image, output];
  
    if (options.l !== null) {
      command.push('-l ' + options.l);
    }
  
    if (options.psm !== null) {
      command.push('-psm ' + options.psm);
    }
  
    if (options.config !== null) {
      command.push(options.config);
    }
  
    command = command.join(' ');
  
    var opts = options.env || {};
  
    // Run the tesseract command
    exec(command, opts, function(err) {
      if (err) {
        // Something went wrong executing the assembled command
        callback(err, null);
        return;
      }
  
      // Find one of the three possible extension
      glob(output + '.+(html|hocr|txt)', function(err, files){
        if (err) {
          callback(err, null);
          return;
        }
        fs.readFile(files[0], Tesseract.outputEncoding, function(err, data) {
          if (err) {
            callback(err, null);
            return;
          }
  
          var index = Tesseract.tmpFiles.indexOf(output);
          if (~index) Tesseract.tmpFiles.splice(index, 1);
  
          fs.unlink(files[0]);
  
          callback(null, data)
        });
      })
    }); // end exec
  
  }

• example usage

  ...
  
  ## Usage
  
  ```JavaScript
  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);
  	}
  });
  ...

module node-tesseract.utils

function node-tesseract.utils.merge (defaults, options)

• description and source-code

  merge = function (defaults, options) {
    defaults = defaults || {};
    if (options && typeof options === 'object') {
      var i = 0,
      keys = Object.keys(options);
  
      for (i = 0; i < keys.length; i += 1) {
        if (options[keys[i]] !== undefined) {
         defaults[keys[i]] = options[keys[i]];
        }
      }
    }
    return defaults;
  }

• example usage

  ...
    process: function(image, options, callback) {
  
  if (typeof options === 'function') {
    callback = options;
    options = null;
  }
  
  options = utils.merge(Tesseract.options, options);
  
  // generate output file name
  var output = path.resolve(tmpdir, 'node-tesseract-' + uuid.v4());
  
  // add the tmp file to the list
  Tesseract.tmpFiles.push(output);
  ...