fv/src/filters/binarize.coffee

FormVision is a node.js library for extracting data from scanned forms

dv = require 'dv'

tesseractInstance = null

# Return a binarized version of *image*. Currently uses Tesseract for this.
module.exports = (image) ->
	tesseractInstance ?= new dv.Tesseract()
	tesseractInstance.image = image
	return tesseractInstance.thresholdImage()